RESONANT CIRCUIT AND HIGH-FREQUENCY FILTER

摘要

A resonant circuit includes a resonator. An inductor is connected in parallel with the resonator. An inductor is connected in series with the parallel circuit formed of the resonator and the inductor. Further, a variable capacitor is connected in parallel with a series circuit formed of the inductor and the parallel circuit formed of the resonator and the inductor. The variable capacitor is connected in series with these circuits. As a result, a resonant circuit and a high-frequency filter supporting more communication signals are provided.

主权项

1. A resonant circuit comprising:
a resonator, a first inductor, and a first variable capacitor connected in series between a first input/output (IO) terminal and a second IO terminal, wherein the resonator is connected at one end to the first IO terminal and the first variable capacitor is connected at one end to the second IO terminal; a second inductor connected in parallel with at least the resonator; and a second variable capacitor connected in parallel with at least the resonator and the first inductor.