HIGH-FREQUENCY FILTER, HIGH-FREQUENCY CIRCUIT, ANTENNA DUPLEXER, AND RADIO TERMINAL

摘要

PROBLEM TO BE SOLVED: To provide a high-frequency filter which can be made small in size. SOLUTION: This high-frequency filter has a ladder-type resonator filter 16, where a plurality of first surface acoustic wave resonators or film bulk resonators are connected in the shape of a ladder circuit, a first terminal and a second terminal 7, a series arm inductance 2 and a parallel arm capacitance 3, which are connected between the ladder-type resonator filter 6 and the first terminal 7, and a series arm capacitance 4 and parallel arm inductance 5 which are connected between the ladder-type resonator filter 16 and the second terminal 7.