1. CPC Sections
  2. CPC Section H
  3. CPC Class H03
  4. CPC Subclass H03H
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CPC
COOPERATIVE PATENT CLASSIFICATION
​​
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) [2024-01]
NOTES

  • 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 "microstructural devices" and "microstructural systems".
  • In this subclass, main groups with a higher number take precedence.
WARNING

  • In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.
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) [2013-01]
H03H 1/0007
.
{of radio frequency interference filters} [2013-01]
H03H 2001/0014
.
{Capacitor filters, i.e. capacitors whose parasitic inductance is of relevance to consider it as filter} [2013-01]
H03H 2001/0021
.
{Constructional details} [2013-01]
H03H 2001/0028
. .
{RFI filters with housing divided in two bodies} [2013-01]
H03H 2001/0035
. .
{Wound magnetic core} [2013-01]
H03H 2001/0042
. .
{Wound, ring or feed-through type capacitor} [2013-01]
H03H 2001/005
. .
{Wound, ring or feed-through type inductor} [2013-01]
H03H 2001/0057
. .
{comprising magnetic material} [2013-01]
H03H 2001/0064
. .
{comprising semiconductor material} [2013-01]
H03H 2001/0071
. .
{comprising zig-zag inductor} [2013-01]
H03H 2001/0078
. .
{comprising spiral inductor on a substrate} [2013-01]
H03H 2001/0085
. .
{Multilayer, e.g. LTCC, HTCC, green sheets} [2024-08]
H03H 2001/0092
.
{Inductor filters, i.e. inductors whose parasitic capacitance is of relevance to consider it as filter} [2013-01]
H03H 1/02
.
of RC networks, e.g. integrated networks [2013-01]
H03H 2/00
Networks using elements or techniques not provided for in groups H03H 3/00 - H03H 21/00 [2016-05]
H03H 2/001
.
{comprising magnetostatic wave network elements} [2013-01]
H03H 2/003
.
{comprising optical fibre network elements (optical elements per se G02B, G02F; transmission systems using light waves H04B 10/00)} [2013-01]
H03H 2/005
.
{Coupling circuits between transmission lines or antennas and transmitters, receivers or amplifiers} [2013-01]
H03H 2/006
. .
{Transmitter or amplifier output circuits} [2013-01]
H03H 2/008
. .
{Receiver or amplifier input circuits} [2013-01]
H03H 3/00
Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators [2013-01]
H03H 3/007
.
for the manufacture of electromechanical resonators or networks [2013-01]
H03H 2003/0071
. .
{of bulk acoustic wave and surface acoustic wave elements in the same process} [2013-01]
H03H 3/0072
. .
{of microelectro-mechanical resonators or networks (micromembranes or microbeams B81B 2203/01; manufacture of microstructural devices in general B81C)} [2017-08]
H03H 3/0073
. . .
{Integration with other electronic structures} [2013-01]
H03H 3/0075
. . .
{Arrangements or methods specially adapted for testing microelecro-mechanical resonators or networks} [2017-08]
H03H 3/0076
. . .
{for obtaining desired frequency or temperature coefficients} [2013-01]
H03H 3/0077
. . . .
{by tuning of resonance frequency} [2013-01]
H03H 3/0078
. . . . .
{involving adjustment of the transducing gap} [2013-01]
H03H 3/013
. .
for obtaining desired frequency or temperature coefficient ({H03H 3/0076} H03H 3/04, H03H 3/10 take precedence) [2013-01]
H03H 3/02
. .
for the manufacture of piezoelectric or electrostrictive resonators or networks (H03H 3/08 takes precedence) [2023-08]
H03H 2003/021
. . .
{the resonators or networks being of the air-gap type} [2013-01]
H03H 2003/022
. . .
{the resonators or networks being of the cantilever type} [2013-01]
H03H 2003/023
. . .
{the resonators or networks being of the membrane type} [2013-01]
H03H 2003/025
. . .
{the resonators or networks comprising an acoustic mirror} [2013-01]
H03H 2003/026
. . .
{the resonators or networks being of the tuning fork type} [2013-01]
H03H 2003/027
. . .
{the resonators or networks being of the microelectro-mechanical [MEMS] type} [2017-08]
H03H 2003/028
. . .
{for obtaining desired values of other parameters} [2013-01]
H03H 3/04
. . .
for obtaining desired frequency or temperature coefficient [2013-01]
H03H 2003/0407
. . . .
{Temperature coefficient} [2013-01]
H03H 2003/0414
. . . .
{Resonance frequency} [2013-01]
H03H 2003/0421
. . . . .
{Modification of the thickness of an element} [2013-01]
H03H 2003/0428
. . . . . .
{of an electrode} [2013-01]
H03H 2003/0435
. . . . . .
{of a piezoelectric layer} [2013-01]
H03H 2003/0442
. . . . . .
{of a non-piezoelectric layer} [2013-01]
H03H 2003/045
. . . . .
{Modification of the area of an element} [2013-01]
H03H 2003/0457
. . . . . .
{of an electrode} [2013-01]
H03H 2003/0464
. . . . .
{operating on an additional circuit element, e.g. a passive circuit element connected to the resonator} [2013-01]
H03H 2003/0471
. . . . .
{of a plurality of resonators at different frequencies} [2013-01]
H03H 2003/0478
. . . . .
{in a process for mass production} [2013-01]
H03H 2003/0485
. . . . .
{during the manufacture of a cantilever} [2013-01]
H03H 2003/0492
. . . . .
{during the manufacture of a tuning-fork} [2013-01]
H03H 3/06
. .
for the manufacture of magnetostrictive resonators or networks [2013-01]
H03H 3/08
. .
for the manufacture of resonators or networks using surface acoustic waves [2013-01]
H03H 3/10
. . .
for obtaining desired frequency or temperature coefficient [2013-01]
H03H 5/00
One-port networks comprising only passive electrical elements as network components [2013-01]
H03H 5/003
.
{comprising distributed impedance elements together with lumped impedance elements} [2013-01]
H03H 5/006
.
{comprising simultaneously tunable inductance and capacitance} [2013-01]
H03H 5/02
.
without voltage- or current-dependent elements [2013-01]
H03H 5/10
. .
comprising at least one element with prescribed temperature coefficient [2013-01]
H03H 5/12
.
with at least one voltage- or current-dependent element [2013-01]
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) [2013-01]
H03H 7/002
.
{Gyrators} [2013-01]
H03H 7/004
.
{Capacitive coupling circuits not otherwise provided for} [2013-01]
H03H 2007/006
.
{MEMS} [2013-01]
H03H 2007/008
. .
{the MEMS being trimmable} [2013-01]
H03H 7/01
.
Frequency selective two-port networks [2013-01]
H03H 7/0107
. .
{Non-linear filters} [2013-01]
H03H 7/0115
. .
{comprising only inductors and capacitors (H03H 7/075, H03H 7/09, H03H 7/12, H03H 7/13 take precedence)} [2013-01]
H03H 7/0123
. .
{comprising distributed impedance elements together with lumped impedance elements} [2013-01]
H03H 2007/013
. .
{Notch or bandstop filters} [2013-01]
H03H 7/0138
. .
{Electrical filters or coupling circuits} [2013-01]
H03H 7/0146
. . .
{Coupling circuits between two tubes, not otherwise provided for} [2013-01]
H03H 7/0153
. .
{Electrical filters; Controlling thereof} [2013-01]
H03H 7/0161
. . .
{Bandpass filters (H03H 7/12 takes precedence)} [2013-01]
H03H 7/0169
. . . .
{Intermediate frequency filters} [2013-01]
H03H 7/0176
. . . . .
{witout magnetic core} [2013-01]
H03H 7/0184
. . . . .
{with ferromagnetic core} [2013-01]
H03H 2007/0192
. .
{Complex filters} [2013-01]
H03H 7/03
. .
comprising means for compensation of loss [2013-01]
H03H 7/06
. .
including resistors (H03H 7/075, H03H 7/09, H03H 7/12, H03H 7/13 take precedence) [2013-01]
H03H 7/065
. . .
Parallel T-filters [2013-01]
H03H 7/07
. . .
Bridged T-filters [2013-01]
H03H 7/075
. .
Ladder networks, e.g. electric wave filters [2013-01]
H03H 7/09
. .
Filters comprising mutual inductance [2013-01]
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) [2013-01]
H03H 7/13
. .
using electro-optic elements [2013-01]
H03H 7/17
. .
{Structural details of sub-circuits of frequency selective networks} [2019-01]
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)} [2013-01]
H03H 7/1716
. . .
{Comprising foot-point elements} [2013-01]
H03H 7/1725
. . . .
{Element to ground being common to different shunt paths, i.e. Y-structure} [2013-01]
H03H 7/1733
. . . .
{Element between different shunt or branch paths (H03H 7/425 takes precedence)} [2013-01]
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 - H03H 7/07)} [2016-05]
H03H 7/175
. . . .
{Series LC in series path (H03H 7/1783 takes precedence)} [2013-01]
H03H 7/1758
. . . .
{Series LC in shunt or branch path (H03H 7/1791 takes precedence)} [2013-01]
H03H 7/1766
. . . .
{Parallel LC in series path (H03H 7/1783 takes precedence)} [2013-01]
H03H 7/1775
. . . .
{Parallel LC in shunt or branch path (H03H 7/1791 takes precedence)} [2013-01]
H03H 7/1783
. . . .
{Combined LC in series path} [2013-01]
H03H 7/1791
. . . .
{Combined LC in shunt or branch path} [2013-01]
H03H 7/18
.
Networks for phase shifting [2013-01]
H03H 7/185
. .
{comprising distributed impedance elements together with lumped impedance elements} [2013-01]
H03H 7/19
. .
Two-port phase shifters providing a predetermined phase shift, e.g. "all-pass" filters [2013-01]
H03H 7/20
. .
Two-port phase shifters providing an adjustable phase shift [2013-01]
H03H 7/21
. .
providing two or more phase shifted output signals, e.g. n-phase output [2013-01]
H03H 7/24
.
Frequency- independent attenuators [2013-01]
H03H 7/25
. .
comprising an element controlled by an electric or magnetic variable (H03H 7/27 takes precedence) [2013-01]
H03H 7/251
. . .
{the element being a thermistor} [2013-01]
H03H 7/253
. . .
{the element being a diode} [2013-01]
H03H 7/255
. . . .
{the element being a PIN diode} [2013-01]
H03H 7/256
. . . .
{the element being a VARACTOR diode} [2013-01]
H03H 7/258
. . .
{using a galvano-magnetic device} [2013-01]
H03H 7/27
. .
comprising a photo-electric element [2013-01]
H03H 7/30
.
Time-delay networks {(analogue shift registers G11C 27/04)} [2013-01]
H03H 7/32
. .
with lumped inductance and capacitance [2013-01]
H03H 7/325
. . .
{Adjustable networks} [2013-01]
H03H 7/34
. .
with lumped and distributed reactance [2013-01]
H03H 7/345
. . .
{Adjustable networks} [2013-01]
H03H 7/38
.
Impedance-matching networks [2013-01]
H03H 7/383
. .
{comprising distributed impedance elements together with lumped impedance elements} [2013-01]
H03H 2007/386
. .
{Multiple band impedance matching} [2013-01]
H03H 7/40
. .
Automatic matching of load impedance to source impedance [2013-01]
H03H 7/42
.
Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns [2024-01]
H03H 7/422
. .
{comprising distributed impedance elements together with lumped impedance elements} [2013-01]
H03H 7/425
. .
{Balance-balance networks} [2019-01]
H03H 7/427
. . .
{Common-mode filters (H02J 3/01 and H02M 1/126 takes precedence)} [2019-01]
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) [2013-01]
H03H 7/461
. .
{particularly adapted for use in common antenna systems} [2013-01]
H03H 7/463
. .
{Duplexers} [2013-01]
H03H 7/465
. . .
{having variable circuit topology, e.g. including switches} [2013-01]
H03H 7/466
. .
{particularly adapted as input circuit for receivers} [2013-01]
H03H 7/468
. .
{particularly adapted as coupling circuit between transmitters and antennas} [2013-01]
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) [2013-01]
H03H 7/482
. .
{particularly adapted for use in common antenna systems} [2013-01]
H03H 7/485
. .
{particularly adapted as input circuit for receivers} [2013-01]
H03H 7/487
. .
{particularly adapted as coupling circuit between transmitters and antennas} [2013-01]
H03H 7/52
.
One-way transmission networks, i.e. unilines [2013-01]
H03H 7/54
.
Modifications of networks to reduce influence of variations of temperature [2013-01]
H03H 9/00
Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators (making single crystals C30B; selection of materials thereof H01L; electromechanical transducers H04R; piezoelectric, electrostrictive or magnetostrictive devices per se H10N 30/00) [2023-08]
H03H 9/0004
.
{Impedance-matching networks (H03H 9/145 takes precedence)} [2013-01]
H03H 9/0009
. .
{using surface acoustic wave devices} [2013-01]
H03H 9/0014
. .
{using bulk acoustic wave devices} [2013-01]
H03H 2009/0019
.
{Surface acoustic wave multichip} [2013-01]
H03H 9/0023
.
{Balance-unbalance or balance-balance networks} [2013-01]
H03H 9/0028
. .
{using surface acoustic wave devices} [2013-01]
H03H 9/0033
. . .
{having one acoustic track only} [2013-01]
H03H 9/0038
. . . .
{the balanced terminals being on the same side of the track} [2013-01]
H03H 9/0042
. . . .
{the balanced terminals being on opposite sides of the track} [2013-01]
H03H 9/0047
. . .
{having two acoustic tracks (H03H 9/008, H03H 9/0085 take precedence)} [2013-01]
H03H 9/0052
. . . .
{being electrically cascaded} [2013-01]
H03H 9/0057
. . . . .
{the balanced terminals being on the same side of the tracks} [2013-01]
H03H 9/0061
. . . . .
{the balanced terminals being on opposite sides of the tracks} [2013-01]
H03H 9/0066
. . . .
{being electrically parallel} [2013-01]
H03H 9/0071
. . . . .
{the balanced terminals being on the same side of the tracks} [2013-01]
H03H 9/0076
. . . . .
{the balanced terminals being on opposite sides of the tracks} [2013-01]
H03H 9/008
. . .
{having three acoustic tracks (H03H 9/0085 takes precedence)} [2013-01]
H03H 9/0085
. . .
{having four acoustic tracks} [2013-01]
H03H 9/009
. . . .
{Lattice filters} [2013-01]
H03H 9/0095
. .
{using bulk acoustic wave devices} [2013-01]
H03H 9/02
.
Details [2013-01]
H03H 9/02007
. .
{of bulk acoustic wave devices} [2013-01]
H03H 9/02015
. . .
{Characteristics of piezoelectric layers, e.g. cutting angles} [2013-01]
H03H 9/02023
. . . .
{consisting of quartz} [2013-01]
H03H 9/02031
. . . .
{consisting of ceramic} [2013-01]
H03H 9/02039
. . . .
{consisting of a material from the crystal group 32, e.g. langasite, langatate, langanite} [2013-01]
H03H 9/02047
. . .
{Treatment of substrates} [2013-01]
H03H 9/02055
. . . .
{of the surface including the back surface} [2013-01]
H03H 9/02062
. . .
{Details relating to the vibration mode} [2013-01]
H03H 9/0207
. . . .
{the vibration mode being harmonic} [2013-01]
H03H 9/02078
. . . .
{the vibration mode being overmoded} [2013-01]
H03H 9/02086
. . .
{Means for compensation or elimination of undesirable effects} [2013-01]
H03H 9/02094
. . . .
{of adherence} [2013-01]
H03H 9/02102
. . . .
{of temperature influence (cutting angles H03H 9/02015)} [2013-01]
H03H 9/0211
. . . .
{of reflections} [2013-01]
H03H 9/02118
. . . .
{of lateral leakage between adjacent resonators} [2013-01]
H03H 9/02125
. . . .
{of parasitic elements} [2013-01]
H03H 9/02133
. . . .
{of stress} [2013-01]
H03H 9/02141
. . . .
{of electric discharge due to pyroelectricity} [2013-01]
H03H 9/02149
. . . .
{of ageing changes of characteristics, e.g. electro-acousto-migration} [2013-01]
H03H 9/02157
. . .
{Dimensional parameters, e.g. ratio between two dimension parameters, length, width or thickness} [2013-01]
H03H 2009/02165
. .
{Tuning} [2013-01]
H03H 2009/02173
. . .
{of film bulk acoustic resonators [FBAR]} [2013-01]
H03H 2009/02181
. . . .
{by application of heat from a heat source} [2013-01]
H03H 2009/02188
. . . .
{Electrically tuning} [2013-01]
H03H 2009/02196
. . . . .
{operating on the FBAR element, e.g. by direct application of a tuning DC voltage} [2013-01]
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} [2013-01]
H03H 2009/02212
. . . .
{Magnetically tuning} [2013-01]
H03H 9/0222
. .
{of interface-acoustic, boundary, pseudo-acoustic or Stonely wave devices} [2013-01]
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} [2013-01]
H03H 9/02236
. .
{of surface skimming bulk wave devices} [2013-01]
H03H 9/02244
. .
{of microelectro-mechanical resonators} [2017-08]
H03H 2009/02251
. . .
{Design} [2013-01]
H03H 9/02259
. . .
{Driving or detection means} [2013-01]
H03H 2009/02267
. . . .
{having dimensions of atomic scale, e.g. involving electron transfer across vibration gap} [2013-01]
H03H 9/02275
. . . .
{Comb electrodes} [2013-01]
H03H 2009/02283
. . .
{Vibrating means} [2013-01]
H03H 2009/02291
. . . .
{Beams} [2013-01]
H03H 2009/02299
. . . . .
{Comb-like, i.e. the beam comprising a plurality of fingers or protrusions along its length} [2013-01]
H03H 2009/02307
. . . . .
{Dog-bone-like structure, i.e. the elongated part of the "bone" is doubly clamped} [2013-01]
H03H 2009/02314
. . . . .
{forming part of a transistor structure} [2013-01]
H03H 2009/02322
. . . . .
{Material} [2013-01]
H03H 2009/0233
. . . .
{comprising perforations} [2013-01]
H03H 9/02338
. . .
{Suspension means} [2013-01]
H03H 2009/02346
. . . .
{Anchors for ring resonators} [2013-01]
H03H 2009/02354
. . . . .
{applied along the periphery, e.g. at nodal points of the ring} [2013-01]
H03H 9/02362
. . . .
{Folded-flexure} [2013-01]
H03H 2009/0237
. . . . .
{applied at the center} [2013-01]
H03H 9/02377
. . . . .
{Symmetric folded-flexure} [2013-01]
H03H 2009/02385
. . . .
{Anchors for square resonators, i.e. resonators comprising a square vibrating membrane} [2013-01]
H03H 9/02393
. . .
{Post-fabrication trimming of parameters, e.g. resonance frequency, Q factor} [2013-01]
H03H 9/02401
. . . .
{by annealing} [2013-01]
H03H 9/02409
. . . .
{by application of a DC-bias voltage (H03H 9/02417 takes precedence)} [2013-01]
H03H 9/02417
. . . .
{involving adjustment of the transducing gap} [2013-01]
H03H 9/02425
. . . . .
{by electrostatically pulling the beam} [2013-01]
H03H 9/02433
. . .
{Means for compensation or elimination of undesired effects} [2013-01]
H03H 2009/0244
. . . .
{Anchor loss} [2013-01]
H03H 9/02448
. . . .
{of temperature influence} [2013-01]
H03H 2009/02456
. . . .
{Parasitic elements or effects, e.g. parasitic capacitive coupling between input and output} [2013-01]
H03H 2009/02464
. . . .
{Pull-in} [2013-01]
H03H 2009/02472
. . . .
{Stiction} [2013-01]
H03H 2009/0248
. . . .
{Strain} [2013-01]
H03H 2009/02488
. . .
{Vibration modes} [2013-01]
H03H 2009/02496
. . . .
{Horizontal, i.e. parallel to the substrate plane} [2013-01]
H03H 2009/02503
. . . . .
{Breath-like, e.g. Lam? mode, wine-glass mode} [2013-01]
H03H 2009/02511
. . . .
{Vertical, i.e. perpendicular to the substrate plane} [2013-01]
H03H 2009/02519
. . . .
{Torsional} [2013-01]
H03H 2009/02527
. . . .
{Combined} [2013-01]
H03H 9/02535
. .
{of surface acoustic wave devices} [2013-01]
H03H 9/02543
. . .
{Characteristics of substrate, e.g. cutting angles} [2013-01]
H03H 9/02551
. . . .
{of quartz substrates} [2013-01]
H03H 9/02559
. . . .
{of lithium niobate or lithium-tantalate substrates} [2013-01]
H03H 9/02566
. . . .
{of semiconductor substrates} [2013-01]
H03H 9/02574
. . . .
{of combined substrates, multilayered substrates, piezoelectrical layers on not-piezoelectrical substrate} [2023-08]
H03H 9/02582
. . . .
{of diamond substrates} [2013-01]
H03H 9/0259
. . . .
{of langasite substrates} [2013-01]
H03H 9/02598
. . . .
{of langatate substrates} [2013-01]
H03H 9/02606
. . . .
{of langanite substrates} [2013-01]
H03H 9/02614
. . .
{Treatment of substrates, e.g. curved, spherical, cylindrical substrates ensuring closed round-about circuits for the acoustical waves} [2013-01]
H03H 9/02622
. . . .
{of the surface, including back surface} [2013-01]
H03H 9/02629
. . . .
{of the edges} [2013-01]
H03H 9/02637
. . .
{Details concerning reflective or coupling arrays} [2013-01]
H03H 9/02645
. . . .
{Waffle-iron or dot arrays} [2013-01]
H03H 9/02653
. . . .
{Grooves or arrays buried in the substrate} [2013-01]
H03H 9/02661
. . . . .
{being located inside the interdigital transducers} [2013-01]
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} [2013-01]
H03H 9/02677
. . . . .
{having specially shaped edges, e.g. stepped, U-shaped edges} [2013-01]
H03H 9/02685
. . . .
{Grating lines having particular arrangements} [2013-01]
H03H 9/02692
. . . . .
{Arched grating lines} [2013-01]
H03H 9/027
. . . . . .
{U-shaped grating lines} [2013-01]
H03H 9/02708
. . . . .
{Shifted grating lines} [2013-01]
H03H 9/02716
. . . . .
{Tilted, fan shaped or slanted grating lines} [2013-01]
H03H 9/02724
. . . . .
{Comb like grating lines} [2013-01]
H03H 9/02732
. . . . . .
{Bilateral comb like grating lines} [2013-01]
H03H 9/0274
. . . . .
{Intra-transducers grating lines} [2013-01]
H03H 9/02748
. . . . . .
{Dog-legged reflectors} [2013-01]
H03H 9/02755
. . . . . .
{Meandering floating or grounded grating lines} [2013-01]
H03H 9/02763
. . . . .
{Left and right side electrically coupled reflectors} [2013-01]
H03H 9/02771
. . . . .
{Reflector banks} [2013-01]
H03H 9/02779
. . . .
{Continuous surface reflective arrays} [2013-01]
H03H 9/02787
. . . . .
{having wave guide like arrangements} [2013-01]
H03H 9/02795
. . . .
{Multi-strip couplers as track changers} [2013-01]
H03H 9/02803
. . . .
{Weighted reflective structures} [2013-01]
H03H 9/02811
. . . . .
{Chirped reflective or coupling arrays} [2013-01]
H03H 9/02818
. . .
{Means for compensation or elimination of undesirable effects} [2013-01]
H03H 9/02826
. . . .
{of adherence} [2013-01]
H03H 9/02834
. . . .
{of temperature influence (cut angles H03H 9/02543)} [2013-01]
H03H 9/02842
. . . .
{of reflections (H03H 9/6406 takes precedence)} [2013-01]
H03H 9/0285
. . . . .
{of triple transit echo} [2013-01]
H03H 9/02858
. . . .
{of wave front distortion} [2013-01]
H03H 9/02866
. . . .
{of bulk wave excitation and reflections} [2013-01]
H03H 9/02874
. . . .
{of direct coupling between input and output transducers} [2013-01]
H03H 9/02881
. . . .
{of diffraction of wave beam} [2013-01]
H03H 9/02889
. . . .
{of influence of mass loading} [2013-01]
H03H 9/02897
. . . .
{of strain or mechanical damage, e.g. strain due to bending influence} [2013-01]
H03H 9/02905
. . . .
{Measures for separating propagation paths on substrate} [2013-01]
H03H 9/02913
. . . .
{Measures for shielding against electromagnetic fields (shielding of electrical components in general H05K 9/00)} [2013-01]
H03H 9/02921
. . . .
{Measures for preventing electric discharge due to pyroelectricity} [2013-01]
H03H 9/02929
. . . .
{of ageing changes of characteristics, e.g. electro-acousto-migration} [2013-01]
H03H 9/02937
. . . .
{of chemical damage, e.g. corrosion} [2013-01]
H03H 9/02944
. . . .
{of ohmic loss} [2013-01]
H03H 9/02952
. . . .
{of parasitic capacitance} [2013-01]
H03H 9/0296
. . .
{Surface acoustic wave [SAW] devices having both acoustic and non-acoustic properties} [2013-01]
H03H 9/02968
. . . .
{with optical devices (mounting in enclosures H03H 9/12)} [2013-01]
H03H 9/02976
. . . .
{with semiconductor devices} [2013-01]
H03H 9/02984
. . .
{Protection measures against damaging} [2013-01]
H03H 9/02992
. . .
{Details of bus bars, contact pads or other electrical connections for finger electrodes} [2013-01]
H03H 9/05
. .
Holders; Supports [2013-01]
H03H 9/0504
. . .
{for bulk acoustic wave devices} [2013-01]
H03H 9/0509
. . . .
{consisting of adhesive elements} [2013-01]
H03H 9/0514
. . . .
{consisting of mounting pads or bumps} [2013-01]
H03H 9/0519
. . . . .
{for cantilever (H03H 9/1021 takes precedence)} [2013-01]
H03H 9/0523
. . . . .
{for flip-chip mounting} [2013-01]
H03H 9/0528
. . . .
{consisting of clips} [2013-01]
H03H 9/0533
. . . .
{consisting of wire} [2013-01]
H03H 9/0538
. . .
{Constructional combinations of supports or holders with electromechanical or other electronic elements} [2013-01]
H03H 9/0542
. . . .
{consisting of a lateral arrangement (H03H 9/0566 takes precedence)} [2013-01]
H03H 9/0547
. . . .
{consisting of a vertical arrangement (H03H 9/0566 takes precedence)} [2013-01]
H03H 9/0552
. . . . .
{the device and the other elements being mounted on opposite sides of a common substrate} [2013-01]
H03H 9/0557
. . . . .
{the other elements being buried in the substrate} [2013-01]
H03H 9/0561
. . . . .
{consisting of a multilayered structure} [2013-01]
H03H 9/0566
. . . .
{for duplexers} [2013-01]
H03H 9/0571
. . . . .
{including bulk acoustic wave [BAW] devices} [2013-01]
H03H 9/0576
. . . . .
{including surface acoustic wave [SAW] devices} [2013-01]
H03H 9/058
. . .
{for surface acoustic wave devices} [2013-01]
H03H 9/0585
. . . .
{consisting of an adhesive layer} [2013-01]
H03H 9/059
. . . .
{consisting of mounting pads or bumps} [2013-01]
H03H 9/0595
. . .
{the holder support and resonator being formed in one body} [2013-01]
H03H 9/08
. . .
Holders with means for regulating temperature [2013-01]
H03H 9/09
. . .
Elastic or damping supports [2013-01]
H03H 9/10
. . .
Mounting in enclosures {(constructional combinations of enclosure with electromechanical and other electronic elements H03H 9/0538)} [2013-01]
H03H 9/1007
. . . .
{for bulk acoustic wave [BAW] devices} [2013-01]
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} [2013-01]
H03H 9/1021
. . . . . .
{the BAW device being of the cantilever type} [2013-01]
H03H 9/1028
. . . . . .
{the BAW device being held between spring terminals} [2013-01]
H03H 9/1035
. . . . .
{the enclosure being defined by two sealing substrates sandwiching the piezoelectric layer of the BAW device} [2013-01]
H03H 9/1042
. . . . .
{the enclosure being defined by a housing formed by a cavity in a resin} [2013-01]
H03H 9/105
. . . . .
{the enclosure being defined by a cover cap mounted on an element forming part of the BAW device} [2013-01]
H03H 9/1057
. . . .
{for microelectro-mechanical devices} [2017-08]
H03H 9/1064
. . . .
{for surface acoustic wave [SAW] devices} [2013-01]
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} [2013-01]
H03H 9/1078
. . . . .
{the enclosure being defined by a foil covering the non-active sides of the SAW device} [2013-01]
H03H 9/1085
. . . . .
{the enclosure being defined by a non-uniform sealing mass covering the non-active sides of the BAW device} [2013-01]
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} [2013-01]
H03H 9/12
. . . .
for networks with interaction of optical and acoustic waves [2013-01]
H03H 9/125
. .
Driving means, e.g. electrodes, coils [2013-01]
H03H 9/13
. . .
for networks consisting of piezoelectric or electrostrictive materials (H03H 9/145 takes precedence) [2023-08]
H03H 9/131
. . . .
{consisting of a multilayered structure} [2013-01]
H03H 9/132
. . . .
{characterized by a particular shape} [2013-01]
H03H 9/133
. . . .
{for electromechanical delay lines or filters} [2013-01]
H03H 9/135
. . .
for networks consisting of magnetostrictive materials (H03H 9/145 takes precedence) [2013-01]
H03H 9/145
. . .
for networks using surface acoustic waves [2013-01]
H03H 9/14502
. . . .
{Surface acoustic wave [SAW] transducers for a particular purpose} [2013-01]
H03H 9/14505
. . . . .
{Unidirectional SAW transducers} [2013-01]
H03H 9/14508
. . . . .
{Polyphase SAW transducers} [2013-01]
H03H 9/14511
. . . . .
{SAW transducers for non-piezoelectric substrates} [2013-01]
H03H 9/14514
. . . . .
{Broad band transducers} [2013-01]
H03H 9/14517
. . . .
{Means for weighting} [2013-01]
H03H 9/1452
. . . . .
{by finger overlap length, apodisation} [2013-01]
H03H 9/14523
. . . . .
{Capacitive tap weighted transducers} [2013-01]
H03H 9/14526
. . . . .
{Finger withdrawal} [2013-01]
H03H 9/14529
. . . . .
{Distributed tap} [2013-01]
H03H 9/14532
. . . . . .
{Series weighting; Transverse weighting} [2013-01]
H03H 9/14535
. . . . . .
{Position weighting} [2013-01]
H03H 9/14538
. . . .
{Formation} [2013-01]
H03H 9/14541
. . . . .
{Multilayer finger or busbar electrode} [2013-01]
H03H 9/14544
. . . .
{Transducers of particular shape or position (weighting H03H 9/14517)} [2013-01]
H03H 9/14547
. . . . .
{Fan shaped; Tilted; Shifted; Slanted; Tapered; Arched; Stepped finger transducers} [2013-01]
H03H 9/1455
. . . . .
{constituted of N parallel or series transducers} [2013-01]
H03H 9/14552
. . . . .
{comprising split fingers} [2013-01]
H03H 9/14555
. . . . .
{Chirped transducers (H03H 9/6406 takes precedence)} [2013-01]
H03H 9/14558
. . . . .
{Slanted, tapered or fan shaped transducers (H03H 9/14561, H03H 9/14564 take precedence)} [2013-01]
H03H 9/14561
. . . . .
{Arched, curved or ring shaped transducers} [2013-01]
H03H 9/14564
. . . . .
{Shifted fingers transducers} [2013-01]
H03H 9/14567
. . . . . .
{Stepped-fan shaped transducers} [2013-01]
H03H 9/1457
. . . . .
{Transducers having different finger widths} [2013-01]
H03H 9/14573
. . . . .
{Arrow type transducers} [2013-01]
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} [2013-01]
H03H 9/14579
. . . . . .
{the last fingers having a different shape} [2013-01]
H03H 9/14582
. . . . . .
{the last fingers having a different pitch} [2013-01]
H03H 9/14585
. . . . . .
{the last fingers being split} [2013-01]
H03H 9/14588
. . . . .
{Horizontally-split transducers} [2013-01]
H03H 9/14591
. . . . .
{Vertically-split transducers} [2013-01]
H03H 9/14594
. . . . .
{Plan-rotated or plan-tilted transducers} [2013-01]
H03H 9/14597
. . . .
{Matching SAW transducers to external electrical circuits} [2013-01]
H03H 9/15
.
Constructional features of resonators consisting of piezoelectric or electrostrictive material (H03H 9/25 takes precedence) [2023-08]
H03H 2009/155
. .
{using MEMS techniques} [2013-01]
H03H 9/17
. .
having a single resonator (crystal tuning forks H03H 9/21) [2013-01]
H03H 9/171
. . .
{implemented with thin-film techniques, i.e. of the film bulk acoustic resonator [FBAR] type} [2013-01]
H03H 9/172
. . . .
{Means for mounting on a substrate, i.e. means constituting the material interface confining the waves to a volume} [2013-01]
H03H 9/173
. . . . .
{Air-gaps} [2013-01]
H03H 9/174
. . . . .
{Membranes} [2013-01]
H03H 9/175
. . . . .
{Acoustic mirrors} [2013-01]
H03H 9/176
. . .
{consisting of ceramic material (H03H 9/177, H03H 9/178 take precedence)} [2013-01]
H03H 9/177
. . .
{of the energy-trap type} [2013-01]
H03H 9/178
. . .
{of a laminated structure of multiple piezoelectric layers with inner electrodes} [2013-01]
H03H 9/19
. . .
consisting of quartz [2013-01]
H03H 9/205
. .
having multiple resonators (crystal tuning forks H03H 9/21) [2013-01]
H03H 9/21
. .
Crystal tuning forks [2013-01]
H03H 9/215
. . .
consisting of quartz [2013-01]
H03H 9/22
.
Constructional features of resonators consisting of magnetostrictive material [2013-01]
H03H 9/24
.
Constructional features of resonators of material which is not piezoelectric, electrostrictive, or magnetostrictive [2023-08]
H03H 9/2405
. .
{of microelectro-mechanical resonators} [2017-08]
H03H 2009/241
. . .
{Bulk-mode MEMS resonators} [2013-01]
H03H 2009/2415
. . . .
{with concave shape [CBAR]} [2013-01]
H03H 2009/2421
. . . .
{with I shape [IBAR]} [2013-01]
H03H 9/2426
. . .
{in combination with other electronic elements} [2013-01]
H03H 9/2431
. . .
{Ring resonators} [2013-01]
H03H 9/2436
. . .
{Disk resonators} [2013-01]
H03H 2009/2442
. . .
{Square resonators} [2013-01]
H03H 9/2447
. . .
{Beam resonators (H03H 9/2468 takes precedence)} [2013-01]
H03H 9/2452
. . . .
{Free-free beam resonators} [2013-01]
H03H 9/2457
. . . .
{Clamped-free beam resonators} [2013-01]
H03H 9/2463
. . . .
{Clamped-clamped beam resonators} [2013-01]
H03H 9/2468
. . .
{Tuning fork resonators} [2013-01]
H03H 9/2473
. . . .
{Double-Ended Tuning Fork [DETF] resonators} [2013-01]
H03H 9/2478
. . . .
{Single-Ended Tuning Fork resonators} [2013-01]
H03H 9/2484
. . . . .
{with two fork tines, e.g. Y-beam cantilever} [2013-01]
H03H 9/2489
. . . . .
{with more than two fork tines} [2013-01]
H03H 9/2494
. . . .
{H-shaped, i.e. two tuning forks with common base} [2013-01]
H03H 9/25
.
Constructional features of resonators using surface acoustic waves {(devices for manipulating acoustic surface waves in general G10K 11/36)} [2013-01]
H03H 9/30
.
Time-delay networks [2013-01]
H03H 9/36
. .
with non-adjustable delay time (H03H 9/40, H03H 9/42 take precedence) [2013-01]
H03H 9/38
. .
with adjustable delay time (H03H 9/40, H03H 9/42 take precedence) [2013-01]
H03H 9/40
. .
Frequency dependent delay lines, e.g. dispersive delay lines (H03H 9/42 takes precedence) [2013-01]
H03H 9/42
. .
using surface acoustic waves {(devices for manipulating acoustic surface waves in general G10K 11/36)} [2013-01]
H03H 9/423
. . .
{with adjustable delay time} [2013-01]
H03H 9/426
. . .
{Magneto-elastic surface waves} [2013-01]
H03H 9/44
. . .
Frequency dependent delay lines, e.g. dispersive delay lines [2013-01]
H03H 9/46
.
Filters (multiple-port electromechanical filters H03H 9/70) [2013-01]
H03H 9/462
. .
{Microelectro-mechanical filters} [2017-08]
H03H 9/465
. . .
{in combination with other electronic elements} [2013-01]
H03H 9/467
. . .
{Post-fabrication trimming of parameters, e.g. center frequency} [2013-01]
H03H 9/48
. .
Coupling means therefor [2013-01]
H03H 9/485
. . .
{for microelectro-mechanical filters} [2017-08]
H03H 9/50
. . .
Mechanical coupling means [2013-01]
H03H 9/505
. . . .
{for microelectro-mechanical filters} [2017-08]
H03H 9/52
. . .
Electric coupling means [2013-01]
H03H 9/525
. . . .
{for microelectro-mechanical filters} [2017-08]
H03H 9/54
. .
comprising resonators of piezoelectric or electrostrictive material (H03H 9/64 takes precedence) [2024-01]
H03H 9/542
. . .
{including passive elements (H03H 9/545 takes precedence)} [2013-01]
H03H 9/545
. . .
{including active elements} [2013-01]
H03H 9/547
. . .
{Notch filters, e.g. notch BAW or thin film resonator filters} [2013-01]
H03H 9/56
. . .
Monolithic crystal filters [2013-01]
H03H 9/562
. . . .
{comprising a ceramic piezoelectric layer} [2013-01]
H03H 9/564
. . . .
{implemented with thin-film techniques} [2013-01]
H03H 9/566
. . . .
{Electric coupling means therefor (H03H 9/0095 takes precedence)} [2013-01]
H03H 9/568
. . . . .
{consisting of a ladder configuration} [2013-01]
H03H 9/58
. . .
Multiple crystal filters [2013-01]
H03H 9/581
. . . .
{comprising ceramic piezoelectric layers} [2013-01]
H03H 9/582
. . . .
{implemented with thin-film techniques} [2013-01]
H03H 9/583
. . . . .
{comprising a plurality of piezoelectric layers acoustically coupled} [2013-01]
H03H 9/584
. . . . . .
{Coupled Resonator Filters [CFR]} [2013-01]
H03H 9/585
. . . . . .
{Stacked Crystal Filters [SCF]} [2013-01]
H03H 9/586
. . . . .
{Means for mounting to a substrate, i.e. means constituting the material interface confining the waves to a volume} [2013-01]
H03H 9/587
. . . . . .
{Air-gaps} [2013-01]
H03H 9/588
. . . . . .
{Membranes} [2013-01]
H03H 9/589
. . . . . .
{Acoustic mirrors} [2013-01]
H03H 9/60
. . . .
Electric coupling means therefor {(H03H 9/0095 takes precedence)} [2013-01]
H03H 9/605
. . . . .
{consisting of a ladder configuration} [2013-01]
H03H 9/62
. .
comprising resonators of magnetostrictive material (H03H 9/64 takes precedence) [2013-01]
H03H 9/64
. .
using surface acoustic waves [2013-01]
H03H 9/6403
. . .
{Programmable filters} [2013-01]
H03H 9/6406
. . .
{Filters characterised by a particular frequency characteristic} [2013-01]
H03H 9/6409
. . . .
{SAW notch filters} [2013-01]
H03H 9/6413
. . . .
{SAW comb filters} [2013-01]
H03H 9/6416
. . . .
{SAW matched filters, e.g. surface acoustic wave compressors, chirped or coded surface acoustic wave filters} [2013-01]
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)} [2013-01]
H03H 9/6423
. . .
{Means for obtaining a particular transfer characteristic} [2013-01]
H03H 9/6426
. . . .
{Combinations of the characteristics of different transducers} [2013-01]
H03H 9/643
. . . .
{the transfer characteristic being determined by reflective or coupling array characteristics} [2013-01]
H03H 9/6433
. . . .
{Coupled resonator filters} [2013-01]
H03H 9/6436
. . . . .
{having one acoustic track only} [2013-01]
H03H 9/644
. . . . .
{having two acoustic tracks} [2013-01]
H03H 9/6443
. . . . . .
{being acoustically coupled} [2013-01]
H03H 9/6446
. . . . . . .
{by floating multistrip couplers (H03H 9/645, H03H 9/6453 take precedence)} [2013-01]
H03H 9/645
. . . . . . .
{by grating reflectors overlapping both tracks} [2013-01]
H03H 9/6453
. . . . . . .
{by at least an interdigital transducer overlapping both tracks} [2013-01]
H03H 9/6456
. . . . . .
{being electrically coupled} [2013-01]
H03H 9/6459
. . . . . . .
{via one connecting electrode} [2013-01]
H03H 9/6463
. . . . . . . .
{the tracks being electrically cascaded} [2013-01]
H03H 9/6466
. . . . . . . . .
{each track containing more than two transducers} [2013-01]
H03H 9/6469
. . . . . . .
{via two connecting electrodes} [2013-01]
H03H 9/6473
. . . . . . . .
{the electrodes being electrically interconnected} [2013-01]
H03H 9/6476
. . . . . . . .
{the tracks being electrically parallel} [2013-01]
H03H 9/6479
. . . . .
{Capacitively coupled SAW resonator filters} [2013-01]
H03H 9/6483
. . . . .
{Ladder SAW filters} [2013-01]
H03H 9/6486
. . . . .
{having crossing or intersecting acoustic tracks, e.g. intersection in a perpendicular or diagonal orientation} [2013-01]
H03H 9/6489
. . .
{Compensation of undesirable effects} [2013-01]
H03H 9/6493
. . . .
{Side lobe suppression} [2013-01]
H03H 9/6496
. . . .
{Reducing ripple in transfer characteristic} [2013-01]
H03H 9/66
.
Phase shifters [2013-01]
H03H 9/68
. .
using surface acoustic waves [2013-01]
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 [2013-01]
H03H 9/703
. .
{Networks using bulk acoustic wave devices} [2013-01]
H03H 9/706
. . .
{Duplexers} [2013-01]
H03H 9/72
. .
Networks using surface acoustic waves [2013-01]
H03H 9/725
. . .
{Duplexers} [2013-01]
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) [2013-01]
H03H 9/76
. .
Networks using surface acoustic waves [2013-01]
H03H 11/00
Networks using active elements [2015-10]
H03H 11/02
.
Multiple-port networks [2013-01]
H03H 11/025
. .
{using current conveyors} [2013-01]
H03H 11/04
. .
Frequency selective two-port networks [2013-01]
H03H 11/0405
. . .
{Non-linear filters} [2013-01]
H03H 2011/0411
. . . .
{Rank order or median filters} [2013-01]
H03H 11/0416
. . .
{using positive impedance converters (H03H 11/08 takes precedence)} [2013-01]
H03H 11/0422
. . .
{using transconductance amplifiers, e.g. gmC filters} [2013-01]
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 - H03H 11/0472 take precedence)} [2016-05]
H03H 11/0433
. . . .
{Two integrator loop filters (H03H 11/0455 takes precedence)} [2013-01]
H03H 11/0438
. . . . .
{Tow-Thomas biquad} [2013-01]
H03H 11/0444
. . . .
{Simulation of ladder networks} [2013-01]
H03H 11/045
. . . . .
{Leapfrog structures} [2013-01]
H03H 11/0455
. . . .
{Multiple integrator loop feedback filters} [2013-01]
H03H 11/0461
. . . .
{Current mode filters} [2013-01]
H03H 11/0466
. . . .
{Filters combining transconductance amplifiers with other active elements, e.g. operational amplifiers, transistors, voltage conveyors} [2013-01]
H03H 11/0472
. . . .
{Current or voltage controlled filters} [2013-01]
H03H 2011/0477
. . .
{using current feedback operational amplifiers} [2013-01]
H03H 2011/0483
. . .
{using operational transresistance amplifiers [OTRA]} [2013-01]
H03H 2011/0488
. . .
{Notch or bandstop filters} [2013-01]
H03H 2011/0494
. . .
{Complex filters} [2013-01]
H03H 11/06
. . .
comprising means for compensation of loss [2013-01]
H03H 11/08
. . .
using gyrators [2013-01]
H03H 11/10
. . .
using negative impedance converters (H03H 11/08 takes precedence) [2013-01]
H03H 11/11
. . .
{using current conveyors} [2013-01]
H03H 11/12
. . .
using amplifiers with feedback ({H03H 11/0422} , H03H 11/08, H03H 11/10 take precedence) [2013-01]
H03H 11/1204
. . . .
{Distributed RC filters} [2013-01]
H03H 11/1208
. . . .
{comprising an electromechanical resonator} [2013-01]
H03H 11/1213
. . . .
{using transistor amplifiers (H03H 11/1204 takes precedence; parallel-T filters H03H 11/1295)} [2013-01]
H03H 11/1217
. . . .
{using a plurality of operational amplifiers (H03H 11/1204 takes precedence; parallel-T filters H03H 11/1295)} [2013-01]
H03H 11/1221
. . . . .
{Theory; Synthesis (H03H 11/1226 - H03H 11/1252 take precedence)} [2016-05]
H03H 11/1226
. . . . .
{Filters using operational amplifier poles} [2013-01]
H03H 11/123
. . . . .
{Modifications to reduce sensitivity} [2013-01]
H03H 11/1234
. . . . .
{Modifications to reduce detrimental influences of amplifier imperfections, e.g. limited gain-bandwith product, limited input impedance} [2013-01]
H03H 11/1239
. . . . .
{Modifications to reduce influence of variations of temperature} [2013-01]
H03H 11/1243
. . . . .
{Simulation of ladder networks} [2013-01]
H03H 11/1247
. . . . . .
{Leapfrog structures} [2020-05]
H03H 11/1252
. . . . .
{Two integrator-loop-filters} [2013-01]
H03H 11/1256
. . . . . .
{Tow-Thomas biquad} [2020-05]
H03H 11/126
. . . .
{using a single operational amplifier (H03H 11/1204 takes precedence; parallel-T filters H03H 11/1295)} [2013-01]
H03H 11/1265
. . . . .
{Synthesis (H03H 11/1269 - H03H 11/1282 take precedence)} [2016-05]
H03H 11/1269
. . . . .
{Filters using the operational amplifier pole} [2013-01]
H03H 11/1273
. . . . .
{Modifications to reduce sensitivity} [2013-01]
H03H 11/1278
. . . . .
{Modifications to reduce detrimental influences of amplifier imperfections, e.g. limited gain-bandwith product, limited input impedance} [2013-01]
H03H 11/1282
. . . . .
{Modifications to reduce influence of variations of temperature} [2013-01]
H03H 11/1286
. . . . .
{Sallen-Key biquad} [2020-05]
H03H 11/1291
. . . .
{Current or voltage controlled filters} [2013-01]
H03H 11/1295
. . . .
{Parallel-T filters} [2013-01]
H03H 11/14
. . .
using electro-optic devices [2013-01]
H03H 11/16
. .
Networks for phase shifting [2013-01]
H03H 11/18
. . .
Two-port phase shifters providing a predetermined phase shift, e.g. "all-pass" filters [2013-01]
H03H 11/20
. . .
Two-port phase shifters providing an adjustable phase shift [2013-01]
H03H 11/22
. . .
providing two or more phase shifted output signals, e.g. n-phase output [2013-01]
H03H 11/24
. .
Frequency-independent attenuators [2013-01]
H03H 11/245
. . .
{using field-effect transistor} [2013-01]
H03H 11/26
. .
Time-delay networks (analogue shift registers G11C 27/04) [2013-01]
H03H 11/265
. . .
{with adjustable delay} [2013-01]
H03H 11/28
. .
Impedance matching networks [2013-01]
H03H 11/30
. . .
Automatic matching of source impedance to load impedance [2013-01]
H03H 11/32
. .
Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns [2024-01]
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) [2013-01]
H03H 11/342
. . .
{particularly adapted for use in common antenna systems} [2013-01]
H03H 11/344
. . .
{Duplexers} [2013-01]
H03H 11/346
. . .
{particularly adapted as input circuit for receivers} [2013-01]
H03H 11/348
. . .
{particularly adapted as coupling circuit between transmitters and antenna} [2013-01]
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) [2013-01]
H03H 11/362
. . .
{particularly adapted for use in common antenna systems} [2013-01]
H03H 11/365
. . .
{particularly adapted as input circuit for receivers} [2013-01]
H03H 11/367
. . .
{particularly adapted as coupling circuit between transmitters and antenna} [2013-01]
H03H 11/38
. .
One-way transmission networks, i.e. unilines [2013-01]
H03H 11/40
. .
Impedance converters [2013-01]
H03H 11/405
. . .
{Positive impedance converters (H03H 11/42 takes precedence; used in frequency selective networks H03H 11/0416)} [2013-01]
H03H 11/42
. . .
Gyrators (used in frequency selective networks H03H 11/08) [2013-01]
H03H 11/44
. . .
Negative impedance converters (H03H 11/42 takes precedence; used in frequency selective networks H03H 11/10) [2013-01]
H03H 11/46
.
One-port networks [2013-01]
H03H 11/48
. .
simulating reactances [2013-01]
H03H 11/481
. . .
{Simulating capacitances} [2020-05]
H03H 11/483
. . .
{Simulating capacitance multipliers} [2020-05]
H03H 11/485
. . .
{Simulating inductances using operational amplifiers} [2020-05]
H03H 11/486
. . .
{Simulating inductances using transconductance amplifiers} [2020-05]
H03H 11/488
. . .
{Simulating inductances using current conveyors} [2020-05]
H03H 11/50
. . .
using gyrators [2013-01]
H03H 11/52
. .
simulating negative resistances [2013-01]
H03H 11/525
. . .
{Simulating frequency dependent negative resistance [FDNR]} [2020-05]
H03H 11/53
. .
{simulating resistances; simulating resistance multipliers} [2020-05]
H03H 11/54
.
Modifications of networks to reduce influence of variations of temperature [2013-01]
H03H 15/00
Transversal filters (electromechanical filters H03H 9/46, H03H 9/70) [2013-01]
H03H 2015/002
.
{Computation saving measures} [2013-01]
H03H 2015/005
.
{comprising capacitors implemented with MEMS technology} [2013-01]
H03H 2015/007
.
{Programmable filters} [2013-01]
H03H 15/02
.
using analogue shift registers [2013-01]
H03H 15/023
. .
{with parallel-input configuration} [2013-01]
H03H 2015/026
.
{Matched filters in charge domain} [2013-01]
H03H 17/00
Networks using digital techniques [2013-01]
H03H 17/0009
.
{Time-delay networks} [2013-01]
H03H 17/0018
. .
{Realizing a fractional delay} [2013-01]
H03H 17/0027
. . .
{by means of a non-recursive filter} [2013-01]
H03H 17/0036
. . .
{by means of a recursive filter} [2013-01]
H03H 17/0045
.
{Impedance matching networks} [2013-01]
H03H 17/0054
.
{Attenuators} [2013-01]
H03H 17/0063
.
{R, L, C, simulating networks} [2013-01]
H03H 2017/0072
.
{Theoretical filter design} [2013-01]
H03H 2017/0081
. .
{of FIR filters} [2013-01]
H03H 2017/009
. .
{of IIR filters} [2013-01]
H03H 17/02
.
Frequency selective networks {(digital computers for complex mathematical operations G06F 17/10)} [2013-01]
H03H 17/0201
. .
{Wave digital filters} [2013-01]
H03H 17/0202
. .
{Two or more dimensional filters; Filters for complex signals (multidimensional convolutions G06F 17/153)} [2013-01]
H03H 2017/0204
. . .
{Comb filters} [2013-01]
H03H 2017/0205
. . .
{Kalman filters} [2013-01]
H03H 2017/0207
. . .
{Median filters} [2013-01]
H03H 2017/0208
. . .
{using neural networks} [2013-01]
H03H 2017/021
. . .
{Wave digital filters} [2013-01]
H03H 17/0211
. .
{using specific transformation algorithms, e.g. WALSH functions, Fermat transforms, Mersenne transforms, polynomial transforms, Hilbert transforms (correlation computation G06F 17/156)} [2013-01]
H03H 17/0213
. . .
{Frequency domain filters using Fourier transforms} [2013-01]
H03H 2017/0214
. . . .
{with input-sampling frequency and output-delivery frequency which differ, e.g. interpolation, extrapolation; anti-aliasing} [2013-01]
H03H 17/0216
. . .
{Quefrency domain filters} [2013-01]
H03H 17/0217
. . .
{Number theoretic transforms} [2013-01]
H03H 17/0219
. .
{Compensation of undesirable effects, e.g. quantisation noise, overflow (stability problems H03H 17/0461)} [2013-01]
H03H 2017/022
. . .
{Rounding error} [2013-01]
H03H 2017/0222
. . .
{Phase error} [2013-01]
H03H 17/0223
. .
{Computation saving measures; Accelerating measures (computations per se G06F)} [2013-01]
H03H 17/0225
. . .
{Measures concerning the multipliers} [2013-01]
H03H 17/0226
. . . .
{comprising look-up tables} [2013-01]
H03H 17/0227
. . .
{Measures concerning the coefficients} [2013-01]
H03H 17/0229
. . . .
{reducing the number of taps} [2013-01]
H03H 17/023
. . . .
{reducing the wordlength, the possible values of coefficients} [2013-01]
H03H 2017/0232
. . . . .
{Canonical signed digit [CSD] or power of 2 coefficients} [2013-01]
H03H 17/0233
. . .
{Measures concerning the signal representation} [2013-01]
H03H 17/0235
. . . .
{reducing the wordlength of signals} [2013-01]
H03H 17/0236
. . . .
{using codes} [2013-01]
H03H 17/0238
. . .
{Measures concerning the arithmetic used (performing computations G06F 7/60)} [2013-01]
H03H 17/0239
. . . .
{Signed digit arithmetic} [2013-01]
H03H 17/0241
. . . .
{Distributed arithmetic} [2013-01]
H03H 17/0242
. . . .
{Residue number arithmetic} [2013-01]
H03H 2017/0244
. . .
{Measures to reduce settling time} [2013-01]
H03H 2017/0245
. . .
{Measures to reduce power consumption (H03H 17/0223 takes precedence)} [2015-09]
H03H 2017/0247
. . .
{Parallel structures using a slower clock} [2013-01]
H03H 17/0248
. .
{Filters characterised by a particular frequency response or filtering method} [2013-01]
H03H 17/025
. . .
{Notch filters} [2013-01]
H03H 17/0251
. . .
{Comb filters} [2013-01]
H03H 17/0252
. . .
{Elliptic filters} [2013-01]
H03H 17/0254
. . .
{Matched filters} [2013-01]
H03H 17/0255
. . .
{Filters based on statistics (adaptive filters H03H 21/0029)} [2013-01]
H03H 17/0257
. . . .
{KALMAN filters} [2013-01]
H03H 17/0258
. . . .
{ARMA filters} [2013-01]
H03H 17/026
. . .
{Averaging filters} [2013-01]
H03H 17/0261
. . .
{Non linear filters} [2013-01]
H03H 17/0263
. . . .
{Rank order filters} [2013-01]
H03H 17/0264
. . .
{Filter sets with mutual related characteristics} [2013-01]
H03H 17/0266
. . . .
{Filter banks} [2013-01]
H03H 17/0267
. . . . .
{comprising non-recursive filters} [2013-01]
H03H 17/0269
. . . . .
{comprising recursive filters} [2013-01]
H03H 17/027
. . . .
{Complementary filters; Phase complementary filters} [2013-01]
H03H 17/0272
. . . .
{Quadrature mirror filters} [2013-01]
H03H 17/0273
. . . .
{Polyphase filters} [2013-01]
H03H 17/0275
. . . . .
{comprising non-recursive filters} [2013-01]
H03H 17/0276
. . . . . .
{having two phases} [2013-01]
H03H 17/0277
. . . . .
{comprising recursive filters} [2013-01]
H03H 17/0279
. . . . . .
{having two phases} [2013-01]
H03H 17/028
. . .
{Polynomial filters} [2013-01]
H03H 17/0282
. . .
{Sinc or gaussian filters (H03H 17/0671 takes precedence)} [2013-01]
H03H 17/0283
. .
{Filters characterised by the filter structure (H03H 17/0202, H03H 17/0219 - H03H 17/0248 take precedence)} [2016-05]
H03H 17/0285
. . .
{Ladder or lattice filters} [2013-01]
H03H 17/0286
. . .
{Combinations of filter structures} [2013-01]
H03H 17/0288
. . . .
{Recursive, non-recursive, ladder, lattice structures} [2013-01]
H03H 17/0289
. . . .
{Digital and active filter structures} [2013-01]
H03H 17/0291
. . . .
{Digital and sampled data filters} [2013-01]
H03H 17/0292
. . .
{Time multiplexed filters; Time sharing filters} [2013-01]
H03H 17/0294
. .
{Variable filters; Programmable filters} [2013-01]
H03H 2017/0295
. . .
{Changing between two filter characteristics} [2013-01]
H03H 2017/0297
. . .
{Coefficients derived from input parameters} [2013-01]
H03H 2017/0298
. .
{DSP implementation} [2013-01]
H03H 17/04
. .
Recursive filters [2013-01]
H03H 17/0405
. . .
{comprising a ROM addressed by the input and output data signals} [2013-01]
H03H 17/0411
. . .
{using DELTA modulation} [2013-01]
H03H 17/0416
. . .
{with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing} [2013-01]
H03H 17/0422
. . . .
{the input and output signals being derived from two separate clocks, i.e. asynchronous sample rate conversion} [2013-01]
H03H 17/0427
. . . .
{characterized by the ratio between the input-sampling and output-delivery frequencies} [2013-01]
H03H 17/0433
. . . . .
{the ratio being arbitrary or irrational} [2013-01]
H03H 17/0438
. . . . .
{the ratio being integer} [2013-01]
H03H 17/0444
. . . . . .
{where the output-delivery frequency is higher than the input sampling frequency, i.e. interpolation} [2013-01]
H03H 17/045
. . . . . .
{where the output-delivery frequency is lower than the input sampling frequency, i.e. decimation} [2013-01]
H03H 17/0455
. . . . .
{the ratio being rational} [2013-01]
H03H 17/0461
. . .
{Quantisation; Rounding; Truncation; Overflow oscillations or limit cycles eliminating measures} [2013-01]
H03H 2017/0466
. . . .
{Reduction of limit cycle oscillation} [2013-01]
H03H 2017/0472
. . .
{based on allpass structures} [2013-01]
H03H 2017/0477
. . .
{Direct form I} [2013-01]
H03H 2017/0483
. . . .
{Transposed} [2013-01]
H03H 2017/0488
. . .
{Direct form II} [2013-01]
H03H 2017/0494
. . . .
{Transposed} [2013-01]
H03H 17/06
. .
Non-recursive filters [2013-01]
H03H 17/0607
. . .
{comprising a ROM addressed by the input data signals} [2013-01]
H03H 17/0614
. . .
{using Delta-modulation} [2013-01]
H03H 17/0621
. . .
{with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing} [2013-01]
H03H 17/0628
. . . .
{the input and output signals being derived from two separate clocks, i.e. asynchronous sample rate conversion} [2013-01]
H03H 17/0635
. . . .
{characterized by the ratio between the input-sampling and output-delivery frequencies} [2013-01]
H03H 17/0642
. . . . .
{the ratio being arbitrary or irrational} [2013-01]
H03H 17/065
. . . . .
{the ratio being integer} [2013-01]
H03H 17/0657
. . . . . .
{where the output-delivery frequency is higher than the input sampling frequency, i.e. interpolation} [2013-01]
H03H 17/0664
. . . . . .
{where the output-delivery frequency is lower than the input sampling frequency, i.e. decimation} [2013-01]
H03H 17/0671
. . . . .
{Cascaded integrator-comb [CIC] filters} [2013-01]
H03H 2017/0678
. . . . . .
{with parallel structure, i.e. parallel CIC [PCIC]} [2013-01]
H03H 17/0685
. . . . .
{the ratio being rational} [2013-01]
H03H 2017/0692
. . .
{Transposed} [2013-01]
H03H 17/08
.
Networks for phase shifting [2013-01]
H03H 19/00
Networks using time-varying elements, e.g. N-path filters [2013-01]
H03H 19/002
.
{N-path filters} [2013-01]
H03H 19/004
.
{Switched capacitor networks} [2013-01]
H03H 19/006
. .
{simulating one-port networks} [2013-01]
H03H 19/008
.
{with variable switch closing time} [2013-01]
H03H 21/00
Adaptive networks [2013-01]
H03H 21/0001
.
{Analogue adaptive filters} [2013-01]
H03H 21/0003
. .
{comprising CCD devices} [2013-01]
H03H 21/0005
. .
{comprising SAW devices} [2013-01]
H03H 21/0007
. .
{comprising switched capacitor [SC] devices} [2013-01]
H03H 2021/0009
. .
{Details} [2013-01]
H03H 2021/001
. . .
{Analog multipliers} [2013-01]
H03H 21/0012
.
{Digital adaptive filters} [2013-01]
H03H 21/0014
. .
{Lattice filters} [2013-01]
H03H 21/0016
. .
{Non linear filters} [2013-01]
H03H 21/0018
. .
{Matched filters} [2013-01]
H03H 21/002
. .
{Filters with a particular frequency response (H03H 21/0014 - H03H 21/0018 take precedence)} [2016-05]
H03H 21/0021
. . .
{Notch filters} [2013-01]
H03H 21/0023
. . .
{Comb filters} [2013-01]
H03H 21/0025
. .
{Particular filtering methods} [2013-01]
H03H 21/0027
. . .
{filtering in the frequency domain} [2013-01]
H03H 21/0029
. . .
{based on statistics} [2013-01]
H03H 21/003
. . . .
{KALMAN filters} [2013-01]
H03H 21/0032
. . . .
{ARMA filters} [2013-01]
H03H 2021/0034
. . .
{Blind source separation} [2013-01]
H03H 2021/0036
. . . .
{of convolutive mixtures} [2013-01]
H03H 2021/0038
. . . .
{of instantaneous mixtures} [2013-01]
H03H 2021/004
. . . .
{using state space representation} [2013-01]
H03H 2021/0041
. . .
{Subband decomposition} [2013-01]
H03H 21/0043
. .
{Adaptive algorithms} [2013-01]
H03H 2021/0045
. . .
{Equation error} [2013-01]
H03H 2021/0047
. . . .
{Combined output and equation error} [2013-01]
H03H 2021/0049
. . .
{Recursive least squares algorithm} [2013-01]
H03H 2021/005
. . . .
{with forgetting factor} [2013-01]
H03H 2021/0052
. . . .
{combined with stochastic gradient algorithm} [2013-01]
H03H 2021/0054
. . . . .
{Affine projection} [2013-01]
H03H 2021/0056
. . .
{Non-recursive least squares algorithm [LMS]} [2013-01]
H03H 2021/0058
. . . .
{Block LMS, i.e. in frequency domain} [2013-01]
H03H 2021/0059
. . . .
{Delayed LMS} [2013-01]
H03H 2021/0061
. . . .
{Normalized LMS [NLMS]} [2013-01]
H03H 2021/0063
. . . . .
{Proportionate NLMS} [2013-01]
H03H 2021/0065
. . . .
{Sign-sign LMS} [2013-01]
H03H 21/0067
. .
{Means or methods for compensation of undesirable effects} [2013-01]
H03H 2021/0069
. . .
{Finite wordlength} [2013-01]
H03H 2021/007
. .
{Computation saving measures; Accelerating measures} [2013-01]
H03H 2021/0072
. . .
{Measures relating to the coefficients} [2013-01]
H03H 2021/0074
. . . .
{Reduction of the update frequency} [2013-01]
H03H 2021/0076
. . .
{Measures relating to the convergence time (H03H 2021/0072 takes precedence)} [2015-09]
H03H 2021/0078
. . . .
{varying the step size} [2013-01]
H03H 2021/0079
. . .
{using look-up tables} [2013-01]
H03H 2021/0081
. .
{Details} [2013-01]
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} [2013-01]
H03H 2021/0085
. .
{Applications} [2013-01]
H03H 2021/0087
. . .
{Prediction} [2013-01]
H03H 2021/0089
. . .
{System identification, i.e. modeling} [2013-01]
H03H 2021/009
. . . .
{with recursive filters} [2013-01]
H03H 2021/0092
. . .
{Equalization, i.e. inverse modeling} [2013-01]
H03H 2021/0094
. . .
{Interference Cancelling} [2013-01]
H03H 2021/0096
. .
{with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; anti-aliasing} [2013-01]
H03H 2021/0098
.
{Adaptive filters comprising analog and digital structures} [2013-01]
H03H 2210/00
Indexing scheme relating to details of tunable filters [2013-01]
H03H 2210/01
.
Tuned parameter of filter characteristics [2013-01]
H03H 2210/012
. .
Centre frequency; Cut-off frequency [2013-01]
H03H 2210/015
. .
Quality factor or bandwidth [2013-01]
H03H 2210/017
. .
Amplitude, gain or attenuation [2013-01]
H03H 2210/02
.
Variable filter component [2013-01]
H03H 2210/021
. .
Amplifier, e.g. transconductance amplifier [2013-01]
H03H 2210/023
. . .
Tuning of transconductance via tail current source [2013-01]
H03H 2210/025
. .
Capacitor [2013-01]
H03H 2210/026
. .
Inductor [2013-01]
H03H 2210/028
. .
Resistor [2013-01]
H03H 2210/03
.
Type of tuning [2013-01]
H03H 2210/033
. .
Continuous [2013-01]
H03H 2210/036
. .
Stepwise [2013-01]
H03H 2210/04
.
Filter calibration method [2013-01]
H03H 2210/043
. .
by measuring time constant [2013-01]
H03H 2210/046
. .
Master -slave [2013-01]
H03H 2218/00
Indexing scheme relating to details of digital filters [2013-01]
H03H 2218/02
.
Coefficients [2013-01]
H03H 2218/025
. .
updated selectively, e.g. by, in the presence of noise, temporally cancelling the update and outputting a predetermined value [2013-01]
H03H 2218/04
.
In-phase and quadrature [I/Q] signals [2013-01]
H03H 2218/06
.
Multiple-input, multiple-output [MIMO]; Multiple-input, single-output [MISO] [2013-01]
H03H 2218/08
.
Resource sharing [2013-01]
H03H 2218/085
. .
Multipliers [2013-01]
H03H 2218/10
.
Multiplier and or accumulator units [2013-01]
H03H 2218/12
.
Signal conditioning [2013-01]
H03H 2218/14
.
Non-uniform sampling [2013-01]
H03H 2220/00
Indexing scheme relating to structures of digital filters [2013-01]
H03H 2220/02
.
Modular, e.g. cells connected in cascade [2013-01]
H03H 2220/04
.
Pipelined [2013-01]
H03H 2220/06
.
Systolic [2013-01]
H03H 2220/08
.
Variable filter length [2013-01]
H03H 2222/00
Indexing scheme relating to digital filtering methods [2013-01]
H03H 2222/02
.
using fuzzy logic [2013-01]
H03H 2222/04
.
using neural networks [2013-01]
H03H 2222/06
.
using wavelets [2013-01]
H03H 2240/00
Indexing scheme relating to filter banks [2013-01]
H03H 2250/00
Indexing scheme relating to dual- or multi-band filters [2013-01]
H03H 2260/00
Theory relating to impedance networks [2013-01]