BANDPASS FILTER AND MULTIPLEXER/DEMULTIPLEXER

摘要

PROBLEM TO BE SOLVED: To provide a small and wide-band bandpass filter having a microwave band, and a multiplexer/demultiplexer.SOLUTION: A bandpass filter comprises: a first parallel resonator arranged on a signal transmission path between a first terminal and a second terminal; a second parallel resonator arranged between the first parallel resonator and the second terminal; a third parallel resonator arranged between the second parallel resonator and the second terminal; a first capacitor in which a first electrode is connected between the first parallel resonator and the second parallel resonator, and a second electrode is connected to a reference potential node; a second capacitor arranged between the second parallel resonator and the second terminal and connected in series to the third parallel resonator; a series resonator connected between a connection node between the second parallel resonator and the third parallel resonator and the reference potential node; and a fourth parallel resonator connected between the connection node between the second parallel resonator and the third parallel resonator and the prescribed reference potential node.SELECTED DRAWING: Figure 1