| 摘要 |
A resonant circuit including a resonator provided on the surface of a circuit board and a main line connected to a negative resistance circuit. The resonator is structured such that a resonant electrode is formed on a dielectric substrate, and a coupling electrode coupled to the resonant electrode is provided on the dielectric substrate. A branch line extends toward the resonator from a main line, and bonding wires are used to connect a leading end of the branch line and the coupling electrode. With this structure, it is possible to use the branch line to shift an unnecessary resonant frequency due to the ground capacitance of the coupling electrode and the inductance of the bonding wires toward a frequency band lower than the resonant frequency of the resonator.
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