| 摘要 |
Provided is a variable filter circuit in which the amplitude and center frequency of the passband can be controlled, steep damping characteristics can be obtained in the region near the passband, and the total number of variable reactance parts can be minimized. The variable filter circuit (10) is provided with an inductor (Ls1) and a capacitor (Cs1) serially connected between a first input/output terminal (P1) and a second input/output terminal (P2), and resonators (Re_p1, Re_p2, Re_p3, Re_p4) and variable capacitors (Cc1, Cc2, Cc3, Cc4) serially connected between the two terminal parts and ground connection terminals. |
