公开(公告)号：US20220131516A1

公开(公告)日：2022-04-28

申请号：US17570414

申请日：2022-01-07

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yuutarou YAMAZAKI ,  Hiroto MOTOYAMA ,  Tetsuo TANIGUCHI ,  Yuji KAMINISHI

IPC: H03H7/38 ,  H03H7/01

Abstract: A diplexer includes a low-band band pass filter between a common input/output terminal and a low-band input/output terminal and a high-band band pass filter between the common input/output terminal and a high-band input/output terminal, wherein the low-band band pass filter includes LC resonators including a first-stage LC resonator to a final-stage LC resonator in order from the common input/output terminal toward the low-band input/output terminal, the high-band band pass filter includes LC resonators including a first-stage LC resonator to a final-stage LC resonator in order from the common input/output terminal toward the high-band input/output terminal, a matching capacitor is between the common input/output terminal and the low-band band pass filter, and the capacitance of a capacitor of the first-stage LC resonator of the low-band band pass filter is smaller than the capacitance of a capacitor of the final-stage LC resonator.