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CPC
COOPERATIVE PATENT CLASSIFICATION
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H03H
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS ; RESONATORS ( measuring, testing G01R; arrangements for producing a reverberation or echo sound G10K 15/08 ; impedance networks or resonators consisting of distributed impedances, e.g. of the waveguide type, H01P; control of amplification, e.g. bandwidth control of amplifiers, H03G; tuning resonant circuits, e.g. tuning coupled resonant circuits, H03J; networks for modifying the frequency characteristics of communication systems H04B )
NOTE
-
This subclass covers :
networks comprising lumped impedance elements;

networks comprising distributed impedance elements together with lumped impedance elements;

networks comprising electromechanical or electro-acoustic elements;

networks simulating reactances and comprising discharge tubes or semiconductor devices;

constructions of electromechanical resonators.


In this subclass, the following expression is used with the meaning indicated:
"passive elements" means resistors, capacitors, inductors, mutual inductors or diodes.


Attention is drawn to the Notes following the titles of class B81 and subclass B81B relating to "micro-structural devices" and "micro-structural systems".

In this subclass, main groups with a higher number take precedence.

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H03H 1/00
Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network ( constructional details of electromechanical transducers H03H 9/00 )
H03H 1/0007
.
{
of radio frequency interference filters
}
H03H 1/02
.
of RC networks, e.g. integrated networks
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H03H 2/00
Networks using elements or techniques not provided for in groups H03H 3/00 to H03H 21/00
H03H 2/001
.
{
comprising magnetostatic wave network elements
}
H03H 2/003
.
{
comprising optical fibre network elements ( optical elements per se G02B , G02F ; transmission systems using light waves H04B 10/00 )
}
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H03H 2/005
.
{
Coupling circuits between transmission lines or antennas and transmitters, receivers or amplifiers
}
H03H 2/006
. .
{
Transmitter or amplifier output circuits
}
H03H 2/008
. .
{
Receiver or amplifier input circuits
}
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H03H 3/00
Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
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H03H 3/007
.
for the manufacture of electromechanical resonators or networks
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H03H 3/0072
. .
{
of micro-electro-mechanical resonators or networks ( micro-membranes or micro-beams B81B3/00M2 ; manufacture of micro-structural devices in general B81C )
}
H03H 3/0073
. . .
{
Integration with other electronic structures
}
H03H 3/0075
. . .
{
Arrangements or methods specially adapted for testing micro-elecro-mechanical resonators or networks
}
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H03H 3/0076
. . .
{
for obtaining desired frequency or temperature coefficients
}
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H03H 3/0077
. . . .
{
by tuning of resonance frequency
}
H03H 3/0078
. . . . .
{
involving adjustment of the transducing gap
}
H03H 3/013
. .
for obtaining desired frequency or temperature coefficient (
{
H03H 3/0076
}
 H03H 3/04 , H03H 3/10 take precedence )
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H03H 3/02
. .
for the manufacture of piezo-electric or electrostrictive resonators or networks ( H03H 3/08 takes precedence )
H03H 3/04
. . .
for obtaining desired frequency or temperature coefficient
H03H 3/06
. .
for the manufacture of magnetostrictive resonators or networks
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H03H 3/08
. .
for the manufacture of resonators or networks using surface acoustic waves
H03H 3/10
. . .
for obtaining desired frequency or temperature coefficient
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H03H 5/00
One-port networks comprising only passive electrical elements as network components
H03H 5/003
.
{
comprising distributed impedance elements together with lumped impedance elements
}
H03H 5/006
.
{
comprising simultaneously tunable inductance and capacitance
}
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H03H 5/02
.
without voltage- or current-dependent elements
H03H 5/10
. .
comprising at least one element with prescribed temperature coefficient
H03H 5/12
.
with at least one voltage- or current-dependent element
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H03H 7/00
Multiple-port networks comprising only passive electrical elements as network components ( receiver input circuits H04B 1/18 ; networks simulating a length of communication cable H04B 3/40 )
H03H 7/002
.
{
Gyrators
}
H03H 7/004
.
{
Capacitive coupling circuits not otherwise provided for
}
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H03H 7/01
.
Frequency selective two-port networks
H03H 7/0107
. .
{
Non-linear filters
}
H03H 7/0115
. .
{
comprising only inductors and capacitors ( H03H 7/075 , H03H 7/09 , H03H 7/12 , H03H 7/13 take precedence )
}
H03H 7/0123
. .
{
comprising distributed impedance elements together with lumped impedance elements
}
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H03H 7/0138
. .
{
Electrical filters or coupling circuits
}
H03H 7/0146
. . .
{
Coupling circuits between two tubes, not otherwise provided for
}
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H03H 7/0153
. .
{
Electrical filters; Controlling thereof
}
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H03H 7/0161
. . .
{
Bandpass filters ( H03H 7/12 takes precedence )
}
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H03H 7/0169
. . . .
{
Intermediate frequency filters
}
H03H 7/0176
. . . . .
{
witout magnetic core
}
H03H 7/0184
. . . . .
{
with ferromagnetic core
}
H03H 7/03
. .
comprising means for compensation of loss
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H03H 7/06
. .
including resistors ( H03H 7/075 , H03H 7/09 , H03H 7/12 , H03H 7/13 take precedence )
H03H 7/065
. . .
Parallel T-filters
H03H 7/07
. . .
Bridged T-filters
H03H 7/075
. .
Ladder networks, e.g. electric wave filters
H03H 7/09
. .
Filters comprising mutual inductance
H03H 7/12
. .
Bandpass or bandstop filters with adjustable bandwidth and fixed centre frequency ( H03H 7/09 takes precedence; automatic control of bandwidth in amplifiers H03G 5/16 )
H03H 7/13
. .
using electro-optic elements
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H03H 7/17
. .
{
Structural details of sub-circuits of frequency selective networks
}
WARNING
-
not complete, pending reorganisation, see provisionally also H03H 7/01 A, H03H 7/0123 to H03H 7/07 , H03H 7/09 to H03H 7/13 and H03H 7/42

H03H 7/1708
. . .
{
Comprising bridging elements, i.e. elements in a series path without own reference to ground and spanning branching nodes of another series path ( H03H 7/07 takes precedence )
}
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H03H 7/1716
. . .
{
Comprising foot-point elements
}
H03H 7/1725
. . . .
{
Element to ground being common to different shunt paths, i.e. Y-structure
}
H03H 7/1733
. . . .
{
Element between different shunt or branch paths ( H03H 7/425 takes precedence )
}
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H03H 7/1741
. . .
{
Comprising typical LC combinations, irrespective of presence and location of additional resistors ( when resistors are present, also classify in H03H 7/06 to H03H 7/07 )
}
H03H 7/175
. . . .
{
Series LC in series path ( H03H 7/1783 takes precedence )
}
H03H 7/1758
. . . .
{
Series LC in shunt or branch path ( H03H 7/1791 takes precedence )
}
H03H 7/1766
. . . .
{
Parallel LC in series path ( H03H 7/1783 takes precedence )
}
H03H 7/1775
. . . .
{
Parallel LC in shunt or branch path ( H03H 7/1791 takes precedence )
}
H03H 7/1783
. . . .
{
Combined LC in series path
}
H03H 7/1791
. . . .
{
Combined LC in shunt or branch path
}
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H03H 7/18
.
Networks for phase shifting
H03H 7/185
. .
{
comprising distributed impedance elements together with lumped impedance elements
}
H03H 7/19
. .
Two-port phase shifters providing a predetermined phase shift, e.g. "all-pass" filters
H03H 7/20
. .
Two-port phase shifters providing an adjustable phase shift
H03H 7/21
. .
providing two or more phase shifted output signals, e.g. n-phase output
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H03H 7/24
.
Frequency- independent attenuators
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H03H 7/25
. .
comprising an element controlled by an electric or magnetic variable ( H03H 7/27 takes precedence )
H03H 7/251
. . .
{
the element being a thermistor
}
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H03H 7/253
. . .
{
the element being a diode
}
H03H 7/255
. . . .
{
the element being a PIN diode
}
H03H 7/256
. . . .
{
the element being a VARACTOR diode
}
H03H 7/258
. . .
{
using a galvano-magnetic device
}
H03H 7/27
. .
comprising a photo-electric element
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H03H 7/30
.
Time-delay networks
{
( analogue shift registers G11C 27/04 )
}
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H03H 7/32
. .
with lumped inductance and capacitance
H03H 7/325
. . .
{
Adjustable networks
}
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H03H 7/34
. .
with lumped and distributed reactance
H03H 7/345
. . .
{
Adjustable networks
}
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H03H 7/38
.
Impedance-matching networks
H03H 7/383
. .
{
comprising distributed impedance elements together with lumped impedance elements
}
H03H 7/40
. .
Automatic matching of load impedance to source impedance
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H03H 7/42
.
Balance/unbalance networks
H03H 7/422
. .
{
comprising distributed impedance elements together with lumped impedance elements
}
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H03H 7/425
. .
{
Balance-balance networks
}
WARNING
-
not complete, pending reorganisation, see provisionally also H03H 1/00 to H03H 1/00 A, H03H 7/01 A, H03H 7/0123 to H03H 7/07 , H03H 7/09 to H03H 7/13 , H03H 7/42 and H03H 7/42 B

H03H 7/427
. . .
{
Common-mode filters ( H02J 3/01 and H02M 1/126 takes precedence )
}
WARNING
-
not complete, pending reorganisation, see provisionally also H03H 1/00 to H03H 1/00 A, H03H 7/01 A, H03H 7/0123 to H03H 7/07 , H03H 7/09 to H03H 7/13 and H03H 7/42

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H03H 7/46
.
Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source ( for use in multiplex transmission systems H04J 1/00 )
H03H 7/461
. .
{
particularly adapted for use in common antenna systems
}
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H03H 7/463
. .
{
Duplexers
}
H03H 7/465
. . .
{
having variable circuit topology, e.g. including switches
}
H03H 7/466
. .
{
particularly adapted as input circuit for receivers
}
H03H 7/468
. .
{
particularly adapted as coupling circuit between transmitters and antennas
}
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H03H 7/48
.
Networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source ( phase shifters providing two or more output signals H03H 7/21 )
H03H 7/482
. .
{
particularly adapted for use in common antenna systems
}
H03H 7/485
. .
{
particularly adapted as input circuit for receivers
}
H03H 7/487
. .
{
particularly adapted as coupling circuit between transmitters and antennas
}
H03H 7/52
.
One-way transmission networks, i.e. unilines
H03H 7/54
.
Modifications of networks to reduce influence of variations of temperature
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H03H 9/00
Networks comprising electromechanical or electro-acoustic devices ; Electromechanical resonators ( making single crystals C30B; selection of materials thereof H01L; piezo-electric, electrostrictive or magnetostrictive devices per se H01L 41/00 ; electromechanical transducers H04R )
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H03H 9/0004
.
{
Impedance-matching networks ( H03H 9/145 takes precedence )
}
H03H 9/0009
. .
{
using surface acoustic wave devices
}
H03H 9/0014
. .
{
using bulk acoustic wave devices
}
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H03H 9/0023
.
{
Balance-unbalance or balance-balance networks
}
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H03H 9/0028
. .
{
using surface acoustic wave devices
}
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H03H 9/0033
. . .
{
having one acoustic track only
}
H03H 9/0038
. . . .
{
the balanced terminals being on the same side of the track
}
H03H 9/0042
. . . .
{
the balanced terminals being on opposite sides of the track
}
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H03H 9/0047
. . .
{
having two acoustic tracks ( H03H 9/008 , H03H 9/0085 take precedence )
}
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H03H 9/0052
. . . .
{
being electrically cascaded
}
H03H 9/0057
. . . . .
{
the balanced terminals being on the same side of the tracks
}
H03H 9/0061
. . . . .
{
the balanced terminals being on opposite sides of the tracks
}
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H03H 9/0066
. . . .
{
being electrically parallel
}
H03H 9/0071
. . . . .
{
the balanced terminals being on the same side of the tracks
}
H03H 9/0076
. . . . .
{
the balanced terminals being on opposite sides of the tracks
}
H03H 9/008
. . .
{
having three acoustic tracks ( H03H 9/0085 takes precedence )
}
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H03H 9/0085
. . .
{
having four acoustic tracks
}
H03H 9/009
. . . .
{
Lattice filters
}
H03H 9/0095
. .
{
using bulk acoustic wave devices
}
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H03H 9/02
.
Details
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H03H 9/02007
. .
{
of bulk acoustic wave devices
}
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H03H 9/02015
. . .
{
Characteristics of piezoelectric layers, e.g. cutting angles
}
H03H 9/02023
. . . .
{
consisting of quartz
}
H03H 9/02031
. . . .
{
consisting of ceramic
}
H03H 9/02039
. . . .
{
consisting of a material from the crystal group 32, e.g. langasite, langatate, langanite
}
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H03H 9/02047
. . .
{
Treatment of substrates
}
H03H 9/02055
. . . .
{
of the surface including the back surface
}
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H03H 9/02062
. . .
{
Details relating to the vibration mode
}
H03H 9/0207
. . . .
{
the vibration mode being harmonic
}
H03H 9/02078
. . . .
{
the vibration mode being overmoded
}
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H03H 9/02086
. . .
{
Means for compensation or elimination of undesirable effects
}
H03H 9/02094
. . . .
{
of adherence
}
H03H 9/02102
. . . .
{
of temperature influence ( cutting angles H03H 9/02015 )
}
H03H 9/0211
. . . .
{
of reflections
}
H03H 9/02118
. . . .
{
of lateral leakage between adjacent resonators
}
H03H 9/02125
. . . .
{
of parasitic elements
}
H03H 9/02133
. . . .
{
of stress
}
H03H 9/02141
. . . .
{
of electric discharge due to pyroelectricity
}
H03H 9/02149
. . . .
{
of ageing changes of characteristics, e.g. electro-acousto-migration
}
H03H 9/02157
. . .
{
Dimensional parameters, e.g. ratio between two dimension parameters, length, width or thickness
}
H03H 9/0222
. .
{
of interface-acoustic, boundary, pseudo-acoustic or Stonely wave devices
}
H03H 9/02228
. .
{
Guided bulk acoustic wave devices or Lamb wave devices having interdigital transducers situated in parallel planes on either side of a piezoelectric layer
}
H03H 9/02236
. .
{
of surface skimming bulk wave devices
}
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H03H 9/02244
. .
{
of micro-electro-mechanical resonators
}
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H03H 9/02259
. . .
{
Driving or detection means
}
H03H 9/02275
. . . .
{
Comb electrodes
}
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H03H 9/02338
. . .
{
Suspension means
}
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H03H 9/02362
. . . .
{
Folded-flexure
}
H03H 9/02377
. . . . .
{
Symmetric folded-flexure
}
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H03H 9/02393
. . .
{
Post-fabrication trimming of parameters, e.g. resonance frequency, Q factor
}
H03H 9/02401
. . . .
{
by annealing
}
H03H 9/02409
. . . .
{
by application of a DC-bias voltage ( H03H 9/02417 takes precedence )
}
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H03H 9/02417
. . . .
{
involving adjustment of the transducing gap
}
H03H 9/02425
. . . . .
{
by electrostatically pulling the beam
}
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H03H 9/02433
. . .
{
Means for compensation or elimination of undesired effects
}
H03H 9/02448
. . . .
{
of temperature influence
}
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H03H 9/02535
. .
{
of surface acoustic wave devices
}
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H03H 9/02543
. . .
{
Characteristics of substrate, e.g. cutting angles
}
H03H 9/02551
. . . .
{
of quartz substrates
}
H03H 9/02559
. . . .
{
of lithium niobate or lithium-tantalate substrates
}
H03H 9/02566
. . . .
{
of semiconductor substrates
}
H03H 9/02574
. . . .
{
of combined substrates, multilayered substrates, piezo-electrical layers on not-piezo- electrical substrate
}
H03H 9/02582
. . . .
{
of diamond substrates
}
H03H 9/0259
. . . .
{
of langasite substrates
}
H03H 9/02598
. . . .
{
of langatate substrates
}
H03H 9/02606
. . . .
{
of langanite substrates
}
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H03H 9/02614
. . .
{
Treatment of substrates, e.g. curved, spherical, cylindrical substrates ensuring closed round-about circuits for the acoustical waves
}
H03H 9/02622
. . . .
{
of the surface, including back surface
}
H03H 9/02629
. . . .
{
of the edges
}
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H03H 9/02637
. . .
{
Details concerning reflective or coupling arrays
}
H03H 9/02645
. . . .
{
Waffle-iron or dot arrays
}
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H03H 9/02653
. . . .
{
Grooves or arrays buried in the substrate
}
H03H 9/02661
. . . . .
{
being located inside the interdigital transducers
}
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H03H 9/02669
. . . .
{
Edge reflection structures, i.e. resonating structures without metallic reflectors, e.g. Bleustein-Gulyaev-Shimizu (BGS), shear horizontal (SH), shear transverse (ST), Love waves devices
}
H03H 9/02677
. . . . .
{
having specially shaped edges, e.g. stepped, U-shaped edges
}
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H03H 9/02685
. . . .
{
Grating lines having particular arrangements
}
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H03H 9/02692
. . . . .
{
Arched grating lines
}
H03H 9/027
. . . . . .
{
U-shaped grating lines
}
H03H 9/02708
. . . . .
{
Shifted grating lines
}
H03H 9/02716
. . . . .
{
Tilted, fan shaped or slanted grating lines
}
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H03H 9/02724
. . . . .
{
Comb like grating lines
}
H03H 9/02732
. . . . . .
{
Bilateral comb like grating lines
}
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H03H 9/0274
. . . . .
{
Intra-transducers grating lines
}
H03H 9/02748
. . . . . .
{
Dog-legged reflectors
}
H03H 9/02755
. . . . . .
{
Meandering floating or grounded grating lines
}
H03H 9/02763
. . . . .
{
Left and right side electrically coupled reflectors
}
H03H 9/02771
. . . . .
{
Reflector banks
}
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H03H 9/02779
. . . .
{
Continuous surface reflective arrays
}
H03H 9/02787
. . . . .
{
having wave guide like arrangements
}
H03H 9/02795
. . . .
{
Multi-strip couplers as track changers
}
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H03H 9/02803
. . . .
{
Weighted reflective structures
}
H03H 9/02811
. . . . .
{
Chirped reflective or coupling arrays
}
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H03H 9/02818
. . .
{
Means for compensation or elimination of undesirable effects
}
H03H 9/02826
. . . .
{
of adherence
}
H03H 9/02834
. . . .
{
of temperature influence ( cut angles H03H 9/02543 )
}
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H03H 9/02842
. . . .
{
of reflections ( H03H 9/6406 takes precedence )
}
H03H 9/0285
. . . . .
{
of triple transit echo
}
H03H 9/02858
. . . .
{
of wave front distortion
}
H03H 9/02866
. . . .
{
of bulk wave excitation and reflections
}
H03H 9/02874
. . . .
{
of direct coupling between input and output transducers
}
H03H 9/02881
. . . .
{
of diffraction of wave beam
}
H03H 9/02889
. . . .
{
of influence of mass loading
}
H03H 9/02897
. . . .
{
of strain or mechanical damage, e.g. strain due to bending influence
}
H03H 9/02905
. . . .
{
Measures for separating propagation paths on substrate
}
H03H 9/02913
. . . .
{
Measures for shielding against electromagnetic fields ( shielding of electrical components in general H05K 9/00 )
}
H03H 9/02921
. . . .
{
Measures for preventing electric discharge due to pyroelectricity
}
H03H 9/02929
. . . .
{
of ageing changes of characteristics, e.g. electro-acousto-migration
}
H03H 9/02937
. . . .
{
of chemical damage, e.g. corrosion
}
H03H 9/02944
. . . .
{
of ohmic loss
}
H03H 9/02952
. . . .
{
of parasitic capacitance
}
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H03H 9/0296
. . .
{
Surface acoustic wave [SAW
}
 devices having both acoustic and non-acoustic properties]
H03H 9/02968
. . . .
{
with optical devices ( mounting in enclosures H03H 9/12 )
}
H03H 9/02976
. . . .
{
with semiconductor devices
}
H03H 9/02984
. . .
{
Protection measures against damaging
}
H03H 9/02992
. . .
{
Details of bus bars, contact pads or other electrical connections for finger electrodes
}
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H03H 9/05
. .
Holders ; Supports
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H03H 9/0504
. . .
{
for bulk acoustic wave devices
}
H03H 9/0509
. . . .
{
consisting of adhesive elements
}
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H03H 9/0514
. . . .
{
consisting of mounting pads or bumps
}
H03H 9/0519
. . . . .
{
for cantilever ( H03H 9/1021 takes precedence )
}
H03H 9/0523
. . . . .
{
for flip-chip mounting
}
H03H 9/0528
. . . .
{
consisting of clips
}
H03H 9/0533
. . . .
{
consisting of wire
}
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H03H 9/0538
. . .
{
Constructional combinations of supports or holders with electromechanical or other electronic elements
}
H03H 9/0542
. . . .
{
consisting of a lateral arrangement ( H03H 9/0566 takes precedence )
}
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H03H 9/0547
. . . .
{
consisting of a vertical arrangement ( H03H 9/0566 takes precedence )
}
H03H 9/0552
. . . . .
{
the device and the other elements being mounted on opposite sides of a common substrate
}
H03H 9/0557
. . . . .
{
the other elements being buried in the substrate
}
H03H 9/0561
. . . . .
{
consisting of a multilayered structure
}
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H03H 9/0566
. . . .
{
for duplexers
}
H03H 9/0571
. . . . .
{
including bulk acoustic wave [BAW
}
 devices]
H03H 9/0576
. . . . .
{
including surface acoustic wave [SAW
}
 devices]
Collapse
H03H 9/058
. . .
{
for surface acoustic wave devices
}
H03H 9/0585
. . . .
{
consisting of an adhesive layer
}
H03H 9/059
. . . .
{
consisting of mounting pads or bumps
}
H03H 9/0595
. . .
{
the holder support and resonator being formed in one body
}
H03H 9/08
. . .
Holders with means for regulating temperature
H03H 9/09
. . .
Elastic or damping supports
Collapse
H03H 9/10
. . .
Mounting in enclosures
{
( constructional combinations of enclosure with electromechanical and other electronic elements H03H 9/0538 )
}
Collapse
H03H 9/1007
. . . .
{
for bulk acoustic wave [BAW
}
 devices]
Collapse
H03H 9/1014
. . . . .
{
the enclosure being defined by a frame built on a substrate and a cap, the frame having no mechanical contact with the BAW device
}
H03H 9/1021
. . . . . .
{
the BAW device being of the cantilever type
}
H03H 9/1028
. . . . . .
{
the BAW device being held between spring terminals
}
H03H 9/1035
. . . . .
{
the enclosure being defined by two sealing substrates sandwiching the piezoelectric layer of the BAW device
}
H03H 9/1042
. . . . .
{
the enclosure being defined by a housing formed by a cavity in a resin
}
H03H 9/105
. . . . .
{
the enclosure being defined by a cover cap mounted on an element forming part of the BAW device
}
H03H 9/1057
. . . .
{
for micro-electro-mechanical devices
}
Collapse
H03H 9/1064
. . . .
{
for surface acoustic wave [SAW
}
 devices]
H03H 9/1071
. . . . .
{
the enclosure being defined by a frame built on a substrate and a cap, the frame having no mechanical contact with the SAW device
}
H03H 9/1078
. . . . .
{
the enclosure being defined by a foil covering the non-active sides of the SAW device
}
H03H 9/1085
. . . . .
{
the enclosure being defined by a non-uniform sealing mass covering the non-active sides of the BAW device
}
H03H 9/1092
. . . . .
{
the enclosure being defined by a cover cap mounted on an element forming part of the surface acoustic wave [SAW
}
 device on the side of the IDT`s]
H03H 9/12
. . . .
for networks with interaction of optical and acoustic waves
Collapse
H03H 9/125
. .
Driving means, e.g. electrodes, coils
Collapse
H03H 9/13
. . .
for networks consisting of piezo-electric or electrostrictive materials ( H03H 9/145 takes precedence )
H03H 9/131
. . . .
{
consisting of a multilayered structure
}
H03H 9/132
. . . .
{
characterized by a particular shape
}
H03H 9/133
. . . .
{
for electromechanical delay lines or filters
}
H03H 9/135
. . .
for networks consisting of magnetostrictive materials ( H03H 9/145 takes precedence )
Collapse
H03H 9/145
. . .
for networks using surface acoustic waves
Collapse
H03H 9/14502
. . . .
{
Surface acoustic wave [SAW
}
 transducers for a particular purpose]
H03H 9/14505
. . . . .
{
Unidirectional SAW transducers
}
H03H 9/14508
. . . . .
{
Polyphase SAW
}
 transducers]
H03H 9/14511
. . . . .
{
SAW transducers for non-piezoelectric substrates
}
H03H 9/14514
. . . . .
{
Broad band transducers
}
Collapse
H03H 9/14517
. . . .
{
Means for weighting
}
H03H 9/1452
. . . . .
{
by finger overlap length, apodisation
}
H03H 9/14523
. . . . .
{
Capacitive tap weighted transducers
}
H03H 9/14526
. . . . .
{
Finger withdrawal
}
Collapse
H03H 9/14529
. . . . .
{
Distributed tap
}
H03H 9/14532
. . . . . .
{
Series weighting; Transverse weighting
}
H03H 9/14535
. . . . . .
{
Position weighting
}
Collapse
H03H 9/14538
. . . .
{
Formation
}
H03H 9/14541
. . . . .
{
Multilayer finger or busbar electrode
}
Collapse
H03H 9/14544
. . . .
{
Transducers of particular shape or position ( weighting H03H 9/14517 )
}
H03H 9/14547
. . . . .
{
Fan shaped; Tilted; Shifted; Slanted; Tapered; Arched; Stepped finger transducers
}
H03H 9/1455
. . . . .
{
constituted of N parallel or series transducers
}
H03H 9/14552
. . . . .
{
comprising split fingers
}
H03H 9/14555
. . . . .
{
Chirped transducers ( H03H 9/6406 takes precedence )
}
H03H 9/14558
. . . . .
{
Slanted, tapered or fan shaped transducers ( H03H 9/14561 , H03H 9/14564 take precedence )
}
H03H 9/14561
. . . . .
{
Arched, curved or ring shaped transducers
}
Collapse
H03H 9/14564
. . . . .
{
Shifted fingers transducers
}
H03H 9/14567
. . . . . .
{
Stepped-fan shaped transducers
}
H03H 9/1457
. . . . .
{
Transducers having different finger widths
}
H03H 9/14573
. . . . .
{
Arrow type transducers
}
Collapse
H03H 9/14576
. . . . .
{
Transducers whereby only the last fingers have different characteristics with respect to the other fingers, e.g. different shape, thickness or material, split finger
}
H03H 9/14579
. . . . . .
{
the last fingers having a different shape
}
H03H 9/14582
. . . . . .
{
the last fingers having a different pitch
}
H03H 9/14585
. . . . . .
{
the last fingers being split
}
H03H 9/14588
. . . . .
{
Horizontally-split transducers
}
H03H 9/14591
. . . . .
{
Vertically-split transducers
}
H03H 9/14594
. . . . .
{
Plan-rotated or plan-tilted transducers
}
H03H 9/14597
. . . .
{
Matching SAW transducers to external electrical circuits
}
Collapse
H03H 9/15
.
Constructional features of resonators consisting of piezo-electric or electrostrictive material ( H03H 9/25 takes precedence )
Collapse
H03H 9/17
. .
having a single resonator ( crystal tuning forks H03H 9/21 )
Collapse
H03H 9/171
. . .
{
implemented with thin-film techniques, i.e. of the film bulk acoustic resonator (FBAR) type
}
Collapse
H03H 9/172
. . . .
{
Means for mounting on a substrate, i.e. means constituting the material interface confining the waves to a volume
}
H03H 9/173
. . . . .
{
Air-gaps
}
H03H 9/174
. . . . .
{
Membranes
}
H03H 9/175
. . . . .
{
Acoustic mirrors
}
H03H 9/176
. . .
{
consisting of ceramic material ( H03H 9/177 , H03H 9/178 take precedence )
}
H03H 9/177
. . .
{
of the energy-trap type
}
H03H 9/178
. . .
{
of a laminated structure of multiple piezoelectric layers with inner electrodes
}
H03H 9/19
. . .
consisting of quartz
H03H 9/205
. .
having multiple resonators ( crystal tuning forks H03H 9/21 )
Collapse
H03H 9/21
. .
Crystal tuning forks
H03H 9/215
. . .
consisting of quartz
H03H 9/22
.
Constructional features of resonators consisting of magnetostrictive material
Collapse
H03H 9/24
.
Constructional features of resonators of material which is not piezo-electric, electrostrictive, or magnetostrictive
Collapse
H03H 9/2405
. .
{
of micro-electro-mechanical resonators
}
H03H 9/2426
. . .
{
in combination with other electronic elements
}
H03H 9/2431
. . .
{
Ring resonators
}
H03H 9/2436
. . .
{
Disk resonators
}
Collapse
H03H 9/2447
. . .
{
Beam resonators ( H03H 9/2468 takes precedence )
}
H03H 9/2452
. . . .
{
Free-free beam resonators
}
H03H 9/2457
. . . .
{
Clamped-free beam resonators
}
H03H 9/2463
. . . .
{
Clamped-clamped beam resonators
}
Collapse
H03H 9/2468
. . .
{
Tuning fork resonators
}
H03H 9/2473
. . . .
{
Double-Ended Tuning Fork (DETF) resonators
}
Collapse
H03H 9/2478
. . . .
{
Single-Ended Tuning Fork resonators
}
H03H 9/2484
. . . . .
{
with two fork tines, e.g. Y-beam cantilever
}
H03H 9/2489
. . . . .
{
with more than two fork tines
}
H03H 9/2494
. . . .
{
H-shaped, i.e. two tuning forks with common base
}
H03H 9/25
.
Constructional features of resonators using surface acoustic waves
{
( devices for manipulating acoustic surface waves in general G10K 11/36 )
}
Collapse
H03H 9/30
.
Time-delay networks
H03H 9/36
. .
with non-adjustable delay time ( H03H 9/40 , H03H 9/42 take precedence )
H03H 9/38
. .
with adjustable delay time ( H03H 9/40 , H03H 9/42 take precedence )
H03H 9/40
. .
Frequency dependent delay lines, e.g. dispersive delay lines ( H03H 9/42 takes precedence )
Collapse
H03H 9/42
. .
using surface acoustic waves
{
( devices for manipulating acoustic surface waves in general G10K 11/36 )
}
H03H 9/423
. . .
{
with adjustable delay time
}
H03H 9/426
. . .
{
Magneto-elastic surface waves
}
H03H 9/44
. . .
Frequency dependent delay lines, e.g. dispersive delay lines
Collapse
H03H 9/46
.
Filters ( multiple-port electromechanical filters H03H 9/70 )
Collapse
H03H 9/462
. .
{
Micro-electro-mechanical filters
}
H03H 9/465
. . .
{
in combination with other electronic elements
}
H03H 9/467
. . .
{
Post-fabrication trimming of parameters, e.g. center frequency
}
Collapse
H03H 9/48
. .
Coupling means therefor
H03H 9/485
. . .
{
for micro-electro-mechanical filters
}
Collapse
H03H 9/50
. . .
Mechanical coupling means
H03H 9/505
. . . .
{
for micro-electro-mechanical filters
}
Collapse
H03H 9/52
. . .
Electric coupling means
H03H 9/525
. . . .
{
for micro-electro-mechanical filters
}
Collapse
H03H 9/54
. .
comprising resonators of piezo-electric or electrostrictive material ( H03H 9/64 takes precedence )
H03H 9/542
. . .
{
including passive elements ( H03H 9/545 takes precedence )
}
H03H 9/545
. . .
{
including active elements
}
H03H 9/547
. . .
{
Notch filters, e.g. notch BAW or thin film resonator filters
}
Collapse
H03H 9/56
. . .
Monolithic crystal filters
H03H 9/562
. . . .
{
comprising a ceramic piezoelectric layer
}
H03H 9/564
. . . .
{
implemented with thin-film techniques
}
Collapse
H03H 9/566
. . . .
{
Electric coupling means therefor ( H03H 9/0095 takes precedence )
}
H03H 9/568
. . . . .
{
consisting of a ladder configuration
}
Collapse
H03H 9/58
. . .
Multiple crystal filters
H03H 9/581
. . . .
{
comprising ceramic piezoelectric layers
}
Collapse
H03H 9/582
. . . .
{
implemented with thin-film techniques
}
Collapse
H03H 9/583
. . . . .
{
comprising a plurality of piezoelectric layers acoustically coupled
}
H03H 9/584
. . . . . .
{
Coupled Resonator Filters (CFR)
}
H03H 9/585
. . . . . .
{
Stacked Crystal Filters (SCF)
}
Collapse
H03H 9/586
. . . . .
{
Means for mounting to a substrate, i.e. means constituting the material interface confining the waves to a volume
}
H03H 9/587
. . . . . .
{
Air-gaps
}
H03H 9/588
. . . . . .
{
Membranes
}
H03H 9/589
. . . . . .
{
Acoustic mirrors
}
Collapse
H03H 9/60
. . . .
Electric coupling means therefor
{
( H03H 9/0095 takes precedence )
}
H03H 9/605
. . . . .
{
consisting of a ladder configuration
}
H03H 9/62
. .
comprising resonators of magnetostrictive material ( H03H 9/64 takes precedence )
Collapse
H03H 9/64
. .
using surface acoustic waves
H03H 9/6403
. . .
{
Programmable filters
}
Collapse
H03H 9/6406
. . .
{
Filters characterised by a particular frequency characteristic
}
H03H 9/6409
. . . .
{
SAW notch filters
}
H03H 9/6413
. . . .
{
SAW comb filters
}
Collapse
H03H 9/6416
. . . .
{
SAW matched filters, e.g. surface acoustic wave compressors, chirped or coded surface acoustic wave filters
}
H03H 9/642
. . . . .
{
SAW transducers details for remote interrogation systems, e.g. surface acoustic wave transducers details for ID-tags ( remote interrogation systems per se G06K 7/10009 , G01S 13/74 )
}
Collapse
H03H 9/6423
. . .
{
Means for obtaining a particular transfer characteristic
}
H03H 9/6426
. . . .
{
Combinations of the characteristics of different transducers
}
H03H 9/643
. . . .
{
the transfer characteristic being determined by reflective or coupling array characteristics
}
Collapse
H03H 9/6433
. . . .
{
Coupled resonator filters
}
H03H 9/6436
. . . . .
{
having one acoustic track only
}
Collapse
H03H 9/644
. . . . .
{
having two acoustic tracks
}
Collapse
H03H 9/6443
. . . . . .
{
being acoustically coupled
}
H03H 9/6446
. . . . . . .
{
by floating multistrip couplers ( H03H 9/645 , H03H 9/6453 take precedence )
}
H03H 9/645
. . . . . . .
{
by grating reflectors overlapping both tracks
}
H03H 9/6453
. . . . . . .
{
by at least an interdigital transducer overlapping both tracks
}
Collapse
H03H 9/6456
. . . . . .
{
being electrically coupled
}
Collapse
H03H 9/6459
. . . . . . .
{
via one connecting electrode
}
Collapse
H03H 9/6463
. . . . . . . .
{
the tracks being electrically cascaded
}
H03H 9/6466
. . . . . . . . .
{
each track containing more than two transducers
}
Collapse
H03H 9/6469
. . . . . . .
{
via two connecting electrodes
}
H03H 9/6473
. . . . . . . .
{
the electrodes being electrically interconnected
}
H03H 9/6476
. . . . . . . .
{
the tracks being electrically parallel
}
H03H 9/6479
. . . . .
{
Capacitively coupled SAW resonator filters
}
H03H 9/6483
. . . . .
{
Ladder SAW filters
}
H03H 9/6486
. . . . .
{
having crossing or intersecting acoustic tracks, e.g. intersection in a perpendicular or diagonal orientation
}
Collapse
H03H 9/6489
. . .
{
Compensation of undesirable effects
}
H03H 9/6493
. . . .
{
Side lobe suppression
}
H03H 9/6496
. . . .
{
Reducing ripple in transfer characteristic
}
Collapse
H03H 9/66
.
Phase shifters
H03H 9/68
. .
using surface acoustic waves
Collapse
H03H 9/70
.
Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
Collapse
H03H 9/703
. .
{
Networks using bulk acoustic wave devices
}
H03H 9/706
. . .
{
Duplexers
}
Collapse
H03H 9/72
. .
Networks using surface acoustic waves
H03H 9/725
. . .
{
Duplexers
}
Collapse
H03H 9/74
.
Multiple-port networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source ( networks for phase shifting H03H 9/66 )
H03H 9/76
. .
Networks using surface acoustic waves
Collapse
H03H 11/00
Networks using active elements
WARNING
-
Group H03H 11/11 does not correspond to former or current IPC groups. Concordance CPC : IPC for these groups is as follows: - H03H 11/11 - H03H 11/04

Collapse
H03H 11/02
.
Multiple-port networks
H03H 11/025
. .
{
using current conveyors
}
Collapse
H03H 11/04
. .
Frequency selective two-port networks
H03H 11/0405
. . .
{
Non-linear filters
}
H03H 11/0416
. . .
{
using positive impedance converters ( H03H 11/08 takes precedence )
}
Collapse
H03H 11/0422
. . .
{
using transconductance amplifiers, e.g. gmC filters
}
H03H 11/0427
. . . .
{
Filters using a single transconductance amplifier; Filters derived from a single transconductor filter, e.g. by element substitution, cascading, parallel connection ( H03H 11/0433 to H03H11/C10 take precedence )
}
Collapse
H03H 11/0433
. . . .
{
Two integrator loop filters ( H03H 11/0455 takes precedence )
}
H03H 11/0438
. . . . .
{
Tow-Thomas biquad
}
Collapse
H03H 11/0444
. . . .
{
Simulation of ladder networks
}
H03H 11/045
. . . . .
{
Leapfrog structures
}
H03H 11/0455
. . . .
{
Multiple integrator loop feedback filters
}
H03H 11/0461
. . . .
{
Current mode filters
}
H03H 11/0466
. . . .
{
Filters combining transconductance amplifiers with other active elements, e.g. operational amplifiers, transistors, voltage conveyors
}
H03H 11/0472
. . . .
{
Current or voltage controlled filters
}
H03H 11/06
. . .
comprising means for compensation of loss
H03H 11/08
. . .
using gyrators
H03H 11/10
. . .
using negative impedance converters ( H03H 11/08 takes precedence )
H03H 11/11
. . .
{
using current conveyors
}
Collapse
H03H 11/12
. . .
using amplifiers with feedback (
{
H03H 11/0422
}
 , H03H 11/08 , H03H 11/10 take precedence )
H03H 11/1204
. . . .
{
Distributed RC filters
}
H03H 11/1208
. . . .
{
comprising an electromechanical resonator
}
H03H 11/1213
. . . .
{
using transistor amplifiers ( H03H 11/1204 takes precedence; parallel-T filters H03H 11/1295 )
}
Collapse
H03H 11/1217
. . . .
{
using a plurality of operational amplifiers ( H03H 11/1204 takes precedence; parallel-T filters H03H 11/1295 )
}
H03H 11/1221
. . . . .
{
Theory; Synthesis ( H03H 11/1226 to H03H 11/1252 take precedence )
}
H03H 11/1226
. . . . .
{
Filters using operational amplifier poles
}
H03H 11/123
. . . . .
{
Modifications to reduce sensitivity
}
H03H 11/1234
. . . . .
{
Modifications to reduce detrimental influences of amplifier imperfections, e.g. limited gain-bandwith product, limited input impedance
}
H03H 11/1239
. . . . .
{
Modifications to reduce influence of variations of temperature
}
Collapse
H03H 11/1243
. . . . .
{
Simulation of ladder networks
}
H03H 11/1247
. . . . . .
{
Leapfrog structures
}
WARNING
-
Not complete, pending reorganisation, see provisionally also H03H 11/1217 to H03H 11/1252

Collapse
H03H 11/1252
. . . . .
{
Two integrator-loop-filters
}
H03H 11/1256
. . . . . .
{
Tow-Thomas biquad
}
WARNING
-
Not complete, pending reorganisation, see provisionally also H03H 11/1217 to H03H 11/1252

Collapse
H03H 11/126
. . . .
{
using a single operational amplifier ( H03H 11/1204 takes precedence; parallel-T filters H03H 11/1295 )
}
H03H 11/1265
. . . . .
{
Synthesis ( H03H 11/1269 to H03H 11/1282 take precedence )
}
H03H 11/1269
. . . . .
{
Filters using the operational amplifier pole
}
H03H 11/1273
. . . . .
{
Modifications to reduce sensitivity
}
H03H 11/1278
. . . . .
{
Modifications to reduce detrimental influences of amplifier imperfections, e.g. limited gain-bandwith product, limited input impedance
}
H03H 11/1282
. . . . .
{
Modifications to reduce influence of variations of temperature
}
H03H 11/1286
. . . . .
{
Sallen-Key biquad
}
WARNING
-
Not complete, pending reorganisation, see provisionally also H03H 11/126 to H03H 11/1282

H03H 11/1291
. . . .
{
Current or voltage controlled filters
}
H03H 11/1295
. . . .
{
Parallel-T filters
}
H03H 11/14
. . .
using electro-optic devices
Collapse
H03H 11/16
. .
Networks for phase shifting
H03H 11/18
. . .
Two-port phase shifters providing a predetermined phase shift, e.g. "all-pass" filters
H03H 11/20
. . .
Two-port phase shifters providing an adjustable phase shift
H03H 11/22
. . .
providing two or more phase shifted output signals, e.g. n-phase output
Collapse
H03H 11/24
. .
Frequency-independent attenuators
H03H 11/245
. . .
{
using field-effect transistor
}
Collapse
H03H 11/26
. .
Time-delay networks ( analogue shift registers G11C 27/04 )
H03H 11/265
. . .
{
with adjustable delay
}
Collapse
H03H 11/28
. .
Impedance matching networks
H03H 11/30
. . .
Automatic matching of source impedance to load impedance
H03H 11/32
. .
Balance-unbalance networks
Collapse
H03H 11/34
. .
Networks for connecting several sources or loads working on different frequencies or frequency bands, to a common load or source ( for use in multiplex transmission systems H04J 1/00 )
H03H 11/342
. . .
{
particularly adapted for use in common antenna systems
}
H03H 11/344
. . .
{
Duplexers
}
H03H 11/346
. . .
{
particularly adapted as input circuit for receivers
}
H03H 11/348
. . .
{
particularly adapted as coupling circuit between transmitters and antenna
}
Collapse
H03H 11/36
. .
Networks for connecting several sources or loads, working on the same frequency band, to a common load or source ( phase shifters providing two or more output signals H03H 11/22 )
H03H 11/362
. . .
{
particularly adapted for use in common antenna systems
}
H03H 11/365
. . .
{
particularly adapted as input circuit for receivers
}
H03H 11/367
. . .
{
particularly adapted as coupling circuit between transmitters and antenna
}
H03H 11/38
. .
One-way transmission networks, i.e. unilines
Collapse
H03H 11/40
. .
Impedance converters
H03H 11/405
. . .
{
Positive impedance converters ( H03H 11/42 takes precedence; used in frequency selective networks H03H 11/0416 )
}
H03H 11/42
. . .
Gyrators ( used in frequency selective networks H03H 11/08 )
H03H 11/44
. . .
Negative impedance converters ( H03H 11/42 takes precedence; used in frequency selective networks H03H 11/10 )
Collapse
H03H 11/46
.
One-port networks
Collapse
H03H 11/48
. .
simulating reactances
H03H 11/481
. . .
{
Simulating capacitances
}
WARNING
-
Not complete, pending reorganisation, see provisionally also H03H 11/48 to H03H 11/52

H03H 11/483
. . .
{
Simulating capacitance multipliers
}
WARNING
-
Not complete, pending reorganisation, see provisionally also H03H 11/48 to H03H 11/52

H03H 11/485
. . .
{
Simulating inductances using operational amplifiers
}
WARNING
-
Not complete, pending reorganisation, see provisionally also H03H 11/48 to H03H 11/52

H03H 11/486
. . .
{
Simulating inductances using transconductance amplifiers
}
WARNING
-
Not complete, pending reorganisation, see provisionally also H03H 11/48 to H03H 11/52

H03H 11/488
. . .
{
Simulating inductances using current conveyors
}
WARNING
-
Not complete, pending reorganisation, see provisionally also H03H 11/48 to H03H 11/52

H03H 11/50
. . .
using gyrators
Collapse
H03H 11/52
. .
simulating negative resistances
H03H 11/525
. . .
{
Simulating frequency dependent negative resistance [FDNR
}
 ]
WARNING
-
Not complete, pending reorganisation, see provisionally also H03H 11/52

H03H 11/53
. .
{
simulating resistances; simulating resistance multipliers
}
WARNING
-
Not complete, pending reorganisation, see provisionally also H03H 11/48 to H03H 11/52

H03H 11/54
.
Modifications of networks to reduce influence of variations of temperature
Collapse
H03H 15/00
Transversal filters ( electromechanical filters H03H 9/46 , H03H 9/70 )
Collapse
H03H 15/02
.
using analogue shift registers
H03H 15/023
. .
{
with parallel-input configuration
}
Collapse
H03H 17/00
Networks using digital techniques
Collapse
H03H 17/0009
.
{
Time-delay networks
}
Collapse
H03H 17/0018
. .
{
Realizing a fractional delay
}
H03H 17/0027
. . .
{
by means of a non-recursive filter
}
H03H 17/0036
. . .
{
by means of a recursive filter
}
H03H 17/0045
.
{
Impedance matching networks
}
H03H 17/0054
.
{
Attenuators
}
H03H 17/0063
.
{
R, L, C, simulating networks
}
Collapse
H03H 17/02
.
Frequency selective networks
{
( digital computers for complex mathematical operations G06F 17/10 )
}
H03H 17/0201
. .
{
Wave digital filters
}
H03H 17/0202
. .
{
Two or more dimensional filters; Filters for complex signals ( multidimensional convolutions G06F 17/153 )
}
Collapse
H03H 17/0211
. .
{
using specific transformation algorithms, e.g. WALSH functions, Fermat transforms, Mersenne transforms, polynomial transforms, Hilbert transforms ( correlation computation G06F 17/156 )
}
H03H 17/0213
. . .
{
Frequency domain filters using Fourier transforms
}
H03H 17/0216
. . .
{
Quefrency domain filters
}
H03H 17/0217
. . .
{
Number theoretic transforms
}
H03H 17/0219
. .
{
Compensation of undesirable effects, e.g. quantisation noise, overflow ( stability problems H03H 17/0461 )
}
Collapse
H03H 17/0223
. .
{
Computation saving measures; Accelerating measures ( computations per se G06F )
}
Collapse
H03H 17/0225
. . .
{
Measures concerning the multipliers
}
H03H 17/0226
. . . .
{
comprising look-up tables
}
Collapse
H03H 17/0227
. . .
{
Measures concerning the coefficients
}
H03H 17/0229
. . . .
{
reducing the number of taps
}
H03H 17/023
. . . .
{
reducing the wordlength, the possible values of coefficients
}
Collapse
H03H 17/0233
. . .
{
Measures concerning the signal representation
}
H03H 17/0235
. . . .
{
reducing the wordlength of signals
}
H03H 17/0236
. . . .
{
using codes
}
Collapse
H03H 17/0238
. . .
{
Measures concerning the arithmetic used ( performing computations G06F 7/60 )
}
H03H 17/0239
. . . .
{
Signed digit arithmetic
}
H03H 17/0241
. . . .
{
Distributed arithmetic
}
H03H 17/0242
. . . .
{
Residue number arithmetic
}
Collapse
H03H 17/0248
. .
{
Filters characterised by a particular frequency response or filtering method
}
H03H 17/025
. . .
{
Notch filters
}
H03H 17/0251
. . .
{
Comb filters
}
H03H 17/0252
. . .
{
Elliptic filters
}
H03H 17/0254
. . .
{
Matched filters
}
Collapse
H03H 17/0255
. . .
{
Filters based on statistics ( adaptive filters H03H 21/0029 )
}
H03H 17/0257
. . . .
{
KALMAN filters
}
H03H 17/0258
. . . .
{
ARMA filters
}
H03H 17/026
. . .
{
Averaging filters
}
Collapse
H03H 17/0261
. . .
{
Non linear filters
}
H03H 17/0263
. . . .
{
Rank order filters
}
Collapse
H03H 17/0264
. . .
{
Filter sets with mutual related characteristics
}
Collapse
H03H 17/0266
. . . .
{
Filter banks
}
H03H 17/0267
. . . . .
{
comprising non-recursive filters
}
H03H 17/0269
. . . . .
{
comprising recursive filters
}
H03H 17/027
. . . .
{
Complementary filters; Phase complementary filters
}
H03H 17/0272
. . . .
{
Quadrature mirror filters
}
Collapse
H03H 17/0273
. . . .
{
Polyphase filters
}
Collapse
H03H 17/0275
. . . . .
{
comprising non-recursive filters
}
H03H 17/0276
. . . . . .
{
having two phases
}
Collapse
H03H 17/0277
. . . . .
{
comprising recursive filters
}
H03H 17/0279
. . . . . .
{
having two phases
}
H03H 17/028
. . .
{
Polynomial filters
}
H03H 17/0282
. . .
{
Sinc or gaussian filters ( H03H 17/0671 takes precedence )
}
Collapse
H03H 17/0283
. .
{
Filters characterised by the filter structure ( H03H 17/0202 , H03H 17/0219 to H03H 17/0248 take precedence )
}
H03H 17/0285
. . .
{
Ladder or lattice filters
}
Collapse
H03H 17/0286
. . .
{
Combinations of filter structures
}
H03H 17/0288
. . . .
{
Recursive, non-recursive, ladder, lattice structures
}
H03H 17/0289
. . . .
{
Digital and active filter structures
}
H03H 17/0291
. . . .
{
Digital and sampled data filters
}
H03H 17/0292
. . .
{
Time multiplexed filters; Time sharing filters
}
H03H 17/0294
. .
{
Variable filters; Programmable filters
}
Collapse
H03H 17/04
. .
Recursive filters
H03H 17/0405
. . .
{
comprising a ROM addressed by the input and output data signals
}
H03H 17/0411
. . .
{
using DELTA modulation
}
Collapse
H03H 17/0416
. . .
{
with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing
}
H03H 17/0422
. . . .
{
the input and output signals being derived from two separate clocks, i.e. asynchronous sample rate conversion
}
Collapse
H03H 17/0427
. . . .
{
characterized by the ratio between the input-sampling and output-delivery frequencies
}
H03H 17/0433
. . . . .
{
the ratio being arbitrary or irrational
}
Collapse
H03H 17/0438
. . . . .
{
the ratio being integer
}
H03H 17/0444
. . . . . .
{
where the output-delivery frequency is higher than the input sampling frequency, i.e. interpolation
}
H03H 17/045
. . . . . .
{
where the output-delivery frequency is lower than the input sampling frequency, i.e. decimation
}
H03H 17/0455
. . . . .
{
the ratio being rational
}
H03H 17/0461
. . .
{
Quantisation; Rounding; Truncation; Overflow oscillations or limit cycles eliminating measures
}
Collapse
H03H 17/06
. .
Non-recursive filters
H03H 17/0607
. . .
{
comprising a ROM addressed by the input data signals
}
H03H 17/0614
. . .
{
using Delta-modulation
}
Collapse
H03H 17/0621
. . .
{
with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing
}
H03H 17/0628
. . . .
{
the input and output signals being derived from two separate clocks, i.e. asynchronous sample rate conversion
}
Collapse
H03H 17/0635
. . . .
{
characterized by the ratio between the input-sampling and output-delivery frequencies
}
H03H 17/0642
. . . . .
{
the ratio being arbitrary or irrational
}
Collapse
H03H 17/065
. . . . .
{
the ratio being integer
}
H03H 17/0657
. . . . . .
{
where the output-delivery frequency is higher than the input sampling frequency, i.e. interpolation
}
H03H 17/0664
. . . . . .
{
where the output-delivery frequency is lower than the input sampling frequency, i.e. decimation
}
H03H 17/0671
. . . . .
{
Cascaded integrator-comb [CIC
}
 filters]
H03H 17/0685
. . . . .
{
the ratio being rational
}
H03H 17/08
.
Networks for phase shifting
Collapse
H03H 19/00
Networks using time-varying elements, e.g. N-path filters
H03H 19/002
.
{
N-path filters
}
Collapse
H03H 19/004
.
{
Switched capacitor networks
}
H03H 19/006
. .
{
simulating one-port networks
}
H03H 19/008
.
{
with variable switch closing time
}
Collapse
H03H 21/00
Adaptive networks
Collapse
H03H 21/0001
.
{
Analogue adaptive filters
}
H03H 21/0003
. .
{
comprising CCD devices
}
H03H 21/0005
. .
{
comprising SAW devices
}
H03H 21/0007
. .
{
comprising switched capacitor [SC
}
 devices]
Collapse
H03H 21/0012
.
{
Digital adaptive filters
}
H03H 21/0014
. .
{
Lattice filters
}
H03H 21/0016
. .
{
Non linear filters
}
H03H 21/0018
. .
{
Matched filters
}
Collapse
H03H 21/002
. .
{
Filters with a particular frequency response ( H03H 21/0014 to H03H 21/0018 take precedence )
}
H03H 21/0021
. . .
{
Notch filters
}
H03H 21/0023
. . .
{
Comb filters
}
Collapse
H03H 21/0025
. .
{
Particular filtering methods
}
H03H 21/0027
. . .
{
filtering in the frequency domain
}
Collapse
H03H 21/0029
. . .
{
based on statistics
}
H03H 21/003
. . . .
{
KALMAN filters
}
H03H 21/0032
. . . .
{
ARMA filters
}
H03H 21/0043
. .
{
Adaptive algorithms
}
H03H 21/0067
. .
{
Means or methods for compensation of undesirable effects
}
Collapse
H03H 2001/00
Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network ( constructional details of electromechanical transducers H03H 9/00 )
H03H 2001/0014
.
Capacitor filters, i.e. capacitors whose parasitic inductance is of relevance to consider it as filter
Collapse
H03H 2001/0021
.
Constructional details
H03H 2001/0028
. .
RFI filters with housing divided in two bodies
H03H 2001/0035
. .
Wound magnetic core
H03H 2001/0042
. .
Wound, ring or feed-through type capacitor
H03H 2001/005
. .
Wound, ring or feed-through type inductor
H03H 2001/0057
. .
comprising magnetic material
H03H 2001/0064
. .
comprising semiconductor material
H03H 2001/0071
. .
comprising zig-zag inductor
H03H 2001/0078
. .
comprising spiral inductor on a substrate
H03H 2001/0085
. .
Multilayer, e.g. LTCC, HTCC, green sheets ( inside PCB filters H05K )
H03H 2001/0092
.
Inductor filters, i.e. inductors whose parasitic capacitance is of relevance to consider it as filter
Collapse
H03H 2003/00
Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
Collapse
H03H 2003/007
.
for the manufacture of electromechanical resonators or networks
H03H 2003/0071
. .
of bulk acoustic wave and surface acoustic wave elements in the same process
Collapse
H03H 2003/02
. .
for the manufacture of piezo-electric or electrostrictive resonators or networks ( H03H 3/08 takes precedence )
H03H 2003/021
. . .
the resonators or networks being of the air-gap type
H03H 2003/022
. . .
the resonators or networks being of the cantilever type
H03H 2003/023
. . .
the resonators or networks being of the membrane type
H03H 2003/025
. . .
the resonators or networks comprising an acoustic mirror
H03H 2003/026
. . .
the resonators or networks being of the tuning fork type
H03H 2003/027
. . .
the resonators or networks being of the micro-electro-mechanical [MEMS] type
H03H 2003/028
. . .
for obtaining desired values of other parameters
Collapse
H03H 2003/04
. . .
for obtaining desired frequency or temperature coefficient
H03H 2003/0407
. . . .
Temperature coefficient
Collapse
H03H 2003/0414
. . . .
Resonance frequency
Collapse
H03H 2003/0421
. . . . .
Modification of the thickness of an element
H03H 2003/0428
. . . . . .
of an electrode
H03H 2003/0435
. . . . . .
of a piezoelectric layer
H03H 2003/0442
. . . . . .
of a non-piezoelectric layer
Collapse
H03H 2003/045
. . . . .
Modification of the area of an element
H03H 2003/0457
. . . . . .
of an electrode
H03H 2003/0464
. . . . .
operating on an additional circuit element, e.g. a passive circuit element connected to the resonator
H03H 2003/0471
. . . . .
of a plurality of resonators at different frequencies
H03H 2003/0478
. . . . .
in a process for mass production
H03H 2003/0485
. . . . .
during the manufacture of a cantilever
H03H 2003/0492
. . . . .
during the manufacture of a tuning-fork
Collapse
H03H 2007/00
Multiple-port networks comprising only passive electrical elements as network components ( receiver input circuits H04B 1/18 ; networks simulating a length of communication cable H04B 3/40 )
Collapse
H03H 2007/006
.
MEMS
H03H 2007/008
. .
the MEMS being trimmable
Collapse
H03H 2007/01
.
Frequency selective two-port networks
H03H 2007/013
. .
Notch or bandstop filters
H03H 2007/0192
. .
Complex filters
Collapse
H03H 2007/38
.
Impedance-matching networks
H03H 2007/386
. .
Multiple band impedance matching
Collapse
H03H 2009/00
Networks comprising electromechanical or electro-acoustic devices ; Electromechanical resonators ( making single crystals C30B; selection of materials thereof H01L; piezo-electric, electrostrictive or magnetostrictive devices per se H01L 41/00 ; electromechanical transducers H04R )
H03H 2009/0019
.
Surface acoustic wave multichip
Collapse
H03H 2009/02
.
Details
Collapse
H03H 2009/02165
. .
Tuning
Collapse
H03H 2009/02173
. . .
of film bulk acoustic resonators [FBAR]
H03H 2009/02181
. . . .
by application of heat from a heat source
Collapse
H03H 2009/02188
. . . .
Electrically tuning
H03H 2009/02196
. . . . .
operating on the FBAR element, e.g. by direct application of a tuning DC voltage
H03H 2009/02204
. . . . .
operating on an additional circuit element, e.g. applying a tuning DC voltage to a passive circuit element connected to the resonator
H03H 2009/02212
. . . .
Magnetically tuning
Collapse
H03H 2009/02244
. .
{
of micro-electro-mechanical resonators
}
H03H 2009/02251
. . .
Design
Collapse
H03H 2009/02259
. . .
{
Driving or detection means
}
H03H 2009/02267
. . . .
having dimensions of atomic scale, e.g. involving electron transfer across vibration gap
Collapse
H03H 2009/02283
. . .
Vibrating means
Collapse
H03H 2009/02291
. . . .
Beams
H03H 2009/02299
. . . . .
Comb-like, i.e. the beam comprising a plurality of fingers or protrusions along its length
H03H 2009/02307
. . . . .
Dog-bone-like structure, i.e. the elongated part of the "bone" is doubly clamped
H03H 2009/02314
. . . . .
forming part of a transistor structure
H03H 2009/02322
. . . . .
Material
H03H 2009/0233
. . . .
comprising perforations
Collapse
H03H 2009/02338
. . .
{
Suspension means
}
Collapse
H03H 2009/02346
. . . .
Anchors for ring resonators
H03H 2009/02354
. . . . .
applied along the periphery, e.g. at nodal points of the ring
Collapse
H03H 2009/02362
. . . .
{
Folded-flexure
}
H03H 2009/0237
. . . . .
applied at the center
H03H 2009/02385
. . . .
Anchors for square resonators, i.e. resonators comprising a square vibrating membrane
Collapse
H03H 2009/02433
. . .
{
Means for compensation or elimination of undesired effects
}
H03H 2009/0244
. . . .
Anchor loss
H03H 2009/02456
. . . .
Parasitic elements or effects, e.g. parasitic capacitive coupling between input and output
H03H 2009/02464
. . . .
Pull-in
H03H 2009/02472
. . . .
Stiction
H03H 2009/0248
. . . .
Strain
Collapse
H03H 2009/02488
. . .
Vibration modes
Collapse
H03H 2009/02496
. . . .
Horizontal, i.e. parallel to the substrate plane
H03H 2009/02503
. . . . .
Breath-like, e.g. Lam? mode, wine-glass mode
H03H 2009/02511
. . . .
Vertical, i.e. perpendicular to the substrate plane
H03H 2009/02519
. . . .
Torsional
H03H 2009/02527
. . . .
Combined
Collapse
H03H 2009/15
.
Constructional features of resonators consisting of piezo-electric or electrostrictive material ( H03H 9/25 takes precedence )
H03H 2009/155
. .
using MEMS techniques
Collapse
H03H 2009/24
.
Constructional features of resonators of material which is not piezo-electric, electrostrictive, or magnetostrictive
Collapse
H03H 2009/2405
. .
{
of micro-electro-mechanical resonators
}
Collapse
H03H 2009/241
. . .
Bulk-mode MEMS resonators
H03H 2009/2415
. . . .
with concave shape [CBAR]
H03H 2009/2421
. . . .
with I shape [IBAR]
H03H 2009/2442
. . .
Square resonators
Collapse
H03H 2011/00
Networks using active elements
WARNING
-
Group H03H 11/11 does not correspond to former or current IPC groups. Concordance CPC : IPC for these groups is as follows: - H03H 11/11 - H03H 11/04

Collapse
H03H 2011/02
.
Multiple-port networks
Collapse
H03H 2011/04
. .
Frequency selective two-port networks
Collapse
H03H 2011/0405
. . .
{
Non-linear filters
}
H03H 2011/0411
. . . .
Rank order or median filters
H03H 2011/0477
. . .
using current feedback operational amplifiers
H03H 2011/0483
. . .
using operational transresistance amplifiers [OTRA]
H03H 2011/0488
. . .
Notch or bandstop filters
H03H 2011/0494
. . .
Complex filters
Collapse
H03H 2015/00
Transversal filters ( electromechanical filters H03H 9/46 , H03H 9/70 )
H03H 2015/002
.
Computation saving measures
H03H 2015/005
.
comprising capacitors implemented with MEMS technology
H03H 2015/007
.
Programmable filters
H03H 2015/026
.
Matched filters in charge domain
Collapse
H03H 2017/00
Networks using digital techniques
Collapse
H03H 2017/0072
.
Theoretical filter design
H03H 2017/0081
. .
of FIR filters
H03H 2017/009
. .
of IIR filters
Collapse
H03H 2017/02
.
Frequency selective networks
{
( digital computers for complex mathematical operations G06F 17/10 )
}
Collapse
H03H 2017/0202
. .
{
Two or more dimensional filters; Filters for complex signals ( multidimensional convolutions G06F 17/153 )
}
H03H 2017/0204
. . .
Comb filters
H03H 2017/0205
. . .
Kalman filters
H03H 2017/0207
. . .
Median filters
H03H 2017/0208
. . .
using neural networks
H03H 2017/021
. . .
Wave digital filters
Collapse
H03H 2017/0211
. .
{
using specific transformation algorithms, e.g. WALSH functions, Fermat transforms, Mersenne transforms, polynomial transforms, Hilbert transforms ( correlation computation G06F 17/156 )
}
Collapse
H03H 2017/0213
. . .
{
Frequency domain filters using Fourier transforms
}
H03H 2017/0214
. . . .
with input-sampling frequency and output-delivery frequency which differ, e.g. interpolation, extrapolation ; anti-aliasing
Collapse
H03H 2017/0219
. .
{
Compensation of undesirable effects, e.g. quantisation noise, overflow ( stability problems H03H 17/0461 )
}
H03H 2017/022
. . .
Rounding error
H03H 2017/0222
. . .
Phase error
Collapse
H03H 2017/0223
. .
{
Computation saving measures; Accelerating measures ( computations per se G06F )
}
Collapse
H03H 2017/0227
. . .
{
Measures concerning the coefficients
}
Collapse
H03H 2017/023
. . . .
{
reducing the wordlength, the possible values of coefficients
}
H03H 2017/0232
. . . . .
Canonical signed digit [CSD] or power of 2 coefficients
H03H 2017/0244
. . .
Measures to reduce settling time
H03H 2017/0245
. . .
Measures to reduce power consumption ( H03H 17/0223 takes preference )
H03H 2017/0247
. . .
Parallel structures using a slower clock
Collapse
H03H 2017/0294
. .
{
Variable filters; Programmable filters
}
H03H 2017/0295
. . .
Changing between two filter characteristics
H03H 2017/0297
. . .
Coefficients derived from input parameters
H03H 2017/0298
. .
DSP implementation
Collapse
H03H 2017/04
. .
Recursive filters
Collapse
H03H 2017/0461
. . .
{
Quantisation; Rounding; Truncation; Overflow oscillations or limit cycles eliminating measures
}
H03H 2017/0466
. . . .
Reduction of limit cycle oscillation
H03H 2017/0472
. . .
based on allpass structures
Collapse
H03H 2017/0477
. . .
Direct form I
H03H 2017/0483
. . . .
Transposed
Collapse
H03H 2017/0488
. . .
Direct form II
H03H 2017/0494
. . . .
Transposed
Collapse
H03H 2017/06
. .
Non-recursive filters
Collapse
H03H 2017/0621
. . .
{
with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing
}
Collapse
H03H 2017/0635
. . . .
{
characterized by the ratio between the input-sampling and output-delivery frequencies
}
Collapse
H03H 2017/0671
. . . . .
{
Cascaded integrator-comb [CIC
}
 filters]
H03H 2017/0678
. . . . . .
with parallel structure, i.e. parallel CIC [PCIC]
H03H 2017/0692
. . .
Transposed
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H03H 2021/00
Adaptive networks
Collapse
H03H 2021/0001
.
{
Analogue adaptive filters
}
Collapse
H03H 2021/0009
. .
Details
H03H 2021/001
. . .
Analog multipliers
Collapse
H03H 2021/0012
.
{
Digital adaptive filters
}
Collapse
H03H 2021/0025
. .
{
Particular filtering methods
}
Collapse
H03H 2021/0034
. . .
Blind source separation
H03H 2021/0036
. . . .
of convolutive mixtures
H03H 2021/0038
. . . .
of instantaneous mixtures
H03H 2021/004
. . . .
using state space representation
H03H 2021/0041
. . .
Subband decomposition
Collapse
H03H 2021/0043
. .
{
Adaptive algorithms
}
Collapse
H03H 2021/0045
. . .
Equation error
H03H 2021/0047
. . . .
Combined output and equation error
Collapse
H03H 2021/0049
. . .
Recursive least squares algorithm
H03H 2021/005
. . . .
with forgetting factor
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H03H 2021/0052
. . . .
combined with stochastic gradient algorithm
H03H 2021/0054
. . . . .
Affine projection
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H03H 2021/0056
. . .
Non-recursive least squares algorithm [LMS]
H03H 2021/0058
. . . .
Block LMS, i.e. in frequency domain
H03H 2021/0059
. . . .
Delayed LMS
Collapse
H03H 2021/0061
. . . .
Normalized LMS [NLMS]
H03H 2021/0063
. . . . .
Proportionate NLMS
H03H 2021/0065
. . . .
Sign-sign LMS
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H03H 2021/0067
. .
{
Means or methods for compensation of undesirable effects
}
H03H 2021/0069
. . .
Finite wordlength
Collapse
H03H 2021/007
. .
Computation saving measures ; Accelerating measures
Collapse
H03H 2021/0072
. . .
Measures relating to the coefficients
H03H 2021/0074
. . . .
Reduction of the update frequency
Collapse
H03H 2021/0076
. . .
Measures relating to the convergence time ( H03H 2021/0072 takes preference )
H03H 2021/0078
. . . .
varying the step size
H03H 2021/0079
. . .
using look-up tables
Collapse
H03H 2021/0081
. .
Details
H03H 2021/0083
. . .
Shadow filter, i.e. one of two filters which are simultaneously adapted, wherein the results of adapting the shadow filter are used for adapting the other filter
Collapse
H03H 2021/0085
. .
Applications
H03H 2021/0087
. . .
Prediction
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H03H 2021/0089
. . .
System identification, i.e. modeling
H03H 2021/009
. . . .
with recursive filters
H03H 2021/0092
. . .
Equalization, i.e. inverse modeling
H03H 2021/0094
. . .
Interference Cancelling
H03H 2021/0096
. .
with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation ; anti-aliasing
H03H 2021/0098
.
Adaptive filters comprising analog and digital structures
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H03H 2210/00
Indexing scheme relating to details of tunable filters
Collapse
H03H 2210/01
.
Tuned parameter of filter characteristics
H03H 2210/012
. .
Centre frequency ; Cut-off frequency
H03H 2210/015
. .
Quality factor or bandwidth
H03H 2210/017
. .
Amplitude, gain or attenuation
Collapse
H03H 2210/02
.
Variable filter component
Collapse
H03H 2210/021
. .
Amplifier, e.g. transconductance amplifier
H03H 2210/023
. . .
Tuning of transconductance via tail current source
H03H 2210/025
. .
Capacitor
H03H 2210/026
. .
Inductor
H03H 2210/028
. .
Resistor
Collapse
H03H 2210/03
.
Type of tuning
H03H 2210/033
. .
Continuous
H03H 2210/036
. .
Stepwise
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H03H 2210/04
.
Filter calibration method
H03H 2210/043
. .
by measuring time constant
H03H 2210/046
. .
Master -slave
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H03H 2218/00
Indexing scheme relating to details of digital filters
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H03H 2218/02
.
Coefficients
H03H 2218/025
. .
updated selectively, e.g. by, in the presence of noise, temporally cancelling the update and outputting a predetermined value
H03H 2218/04
.
In-phase and quadrature [I/Q] signals
H03H 2218/06
.
Multiple-input, multiple-output [MIMO] ; Multiple-input, single-output [MISO]
Collapse
H03H 2218/08
.
Resource sharing
H03H 2218/085
. .
Multipliers
H03H 2218/10
.
Multiplier and or accumulator units
H03H 2218/12
.
Signal conditioning
H03H 2218/14
.
Non-uniform sampling
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H03H 2220/00
Indexing scheme relating to structures of digital filters
H03H 2220/02
.
Modular, e.g. cells connected in cascade
H03H 2220/04
.
Pipelined
H03H 2220/06
.
Systolic
H03H 2220/08
.
Variable filter length
Collapse
H03H 2222/00
Indexing scheme relating to digital filtering methods
H03H 2222/02
.
using fuzzy logic
H03H 2222/04
.
using neural networks
H03H 2222/06
.
using wavelets
H03H 2240/00
Indexing scheme relating to filter banks
H03H 2250/00
Indexing scheme relating to dual- or multi-band filters
H03H 2260/00
Theory relating to impedance networks
This page is owned by Office of Patent Classification.
Last Modified: 04/16/2013 4:31:16 PM