البحث في مجموعات البراءات الوطنية والدولية

1. (WO2018061878) ELASTIC WAVE DEVICE, HIGH FREQUENCY FRONT END CIRCUIT, AND COMMUNICATION DEVICE

Pub. No.:    WO/2018/061878    International Application No.:    PCT/JP2017/033743
Publication Date: Fri Apr 06 01:59:59 CEST 2018 International Filing Date: Wed Sep 20 01:59:59 CEST 2017
IPC: H03H 9/145
H03H 9/72
H04B 1/00
H04B 1/18
H04B 1/40
Applicants: MURATA MANUFACTURING CO., LTD.
株式会社村田製作所
Inventors: NOSAKA, Koji
野阪 浩司
Title: ELASTIC WAVE DEVICE, HIGH FREQUENCY FRONT END CIRCUIT, AND COMMUNICATION DEVICE
Abstract:
A variable filter (10) is provided with a serial arm resonator (s1), and a parallel arm resonance circuit (21). The parallel arm resonance circuit (21) has a parallel arm resonator (p1), and a capacitive element (C1) connected to the parallel arm resonator (p1). The serial arm resonator (s1) and the parallel arm resonator (p1) respectively have IDT electrodes (111 and 121) comprising a plurality of electrode fingers formed on a substrate (102), and the film thickness of the plurality of electrode fingers of the parallel arm resonator (p1) is greater than the film thickness of the plurality of electrode fingers of the serial arm resonator (s1).