| US 7,538,628 B2 | ||
| Harmonic oscillator using transmission line resonator | ||
| Masayoshi Aikawa, Saga (Japan); Takayuki Tanaka, Saga (Japan); Fumio Asamura, Saitama (Japan); Kenji Kawahata, Saitama (Japan); and Katsuaki Sakamoto, Saitama (Japan) | ||
| Assigned to Nihon Dempa Kogyo Co., Ltd., (Japan); and Saga University, (Japan) | ||
| Filed on Jan. 17, 2007, as Appl. No. 11/654,360. | ||
| Claims priority of application No. 2006-010531 (JP), filed on Jan. 18, 2006. | ||
| Prior Publication US 2007/0164830 A1, Jul. 19, 2007 | ||
| Int. Cl. H03B 5/18 (2006.01); H03B 9/14 (2006.01) | ||
| U.S. Cl. 331—107SL [331/53; 331/107 P] | 15 Claims |
| 1. A harmonic oscillator comprising:
a transmission line resonator in which an oscillation frequency depends on an electrical length of a transmission line and
both ends of the transmission line are electrical open ends; and
an active element for oscillation as a negative resistance connecting to the transmission line resonator, the harmonic oscillator
using the transmission line resonator in which
each standing wave of a fundamental wave of the oscillation frequency and odd-order harmonics related to the fundamental wave
has a minimum voltage displacement portion at a midpoint portion of the transmission line resonator and maximum voltage displacement
portions in opposite phase to each other at both ends and the standing wave has a voltage displacement distribution which
is odd-symmetric with respect to the midpoint portion;
each standing wave of even-order harmonics related to the fundamental wave has a maximum voltage displacement portion at the
midpoint portion of the transmission line resonator and maximum voltage displacement portions in phase or opposite phase in
relation to the midpoint portion at both ends and the standing wave has a voltage displacement distribution which is symmetric
with respect to the midpoint portion; and
an output line is connected to the midpoint portion of the transmission line resonator to suppress output levels of the fundamental
wave and odd-order harmonics, and the even-order harmonics are obtained on the output line, wherein
in the transmission line resonator, suppressing means is provided for suppressing a voltage displacement distribution of second
harmonic among the even-order harmonics; and
the suppressing means is provided at a position between the midpoint portion and either ends of the transmission line resonator,
the position being at least a minimum voltage displacement portion for the second harmonic.
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