Invention Grant
- Patent Title: Filter device, multiplexer, radio frequency front end circuit, and communication device
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Application No.: US16546827Application Date: 2019-08-21
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Publication No.: US11146242B2Publication Date: 2021-10-12
- Inventor: Tadashi Sugahara , Hirotsugu Mori , Koji Nosaka
- Applicant: Murata Manufacturing Co., Ltd.
- Applicant Address: JP Kyoto
- Assignee: Murata Manufacturing Co., Ltd.
- Current Assignee: Murata Manufacturing Co., Ltd.
- Current Assignee Address: JP Kyoto
- Agency: Peame & Gordon LLP
- Priority: JPJP2017-036603 20170228
- Main IPC: H03H9/54
- IPC: H03H9/54 ; H03H7/01 ; H03H9/205 ; H03H9/64 ; H03H9/76

Abstract:
A filter (10) has a first passband and a second passband on a higher frequency side than the first passband and includes a series arm circuit (11) and a parallel arm circuit (12), wherein the parallel arm circuit (12) includes a parallel arm resonator (p1) connected between a node (x1) and ground and having a resonant frequency frp located between a first passband and a second passband, an inductor (L1) connected between the node (x1) and the ground, and an inductor (L2) connected between the node (x1) and the ground and connected in series to the parallel arm resonator (p1), and a circuit in which the parallel arm resonator (p1) and the inductor (L2) are connected in series is connected in parallel to the inductor (L1).
Information query
IPC分类: