Title:
HIGH-FREQUENCY FILTER CIRCUIT, MULTIPLEXER, HIGH-FREQUENCY FRONT END CIRCUIT AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/204346
Kind Code:
A1
Abstract:
A filter (22A) is provided with a series arm circuit connected between an input/output terminal (22n) and an input/output terminal (22m), and a parallel arm circuit (120A) connected between a node (x) and the ground. The parallel arm circuit (120A) comprises a first circuit (10) having a parallel arm resonator (22p1), and a second circuit (20) that is connected in parallel to the first circuit (10) and has a parallel arm resonator (22p2). At least one circuit among the first circuit (10) and the second circuit (20) further comprises a frequency variable circuit (22T) comprising an impedance element and a switch (22SW) that are connected in parallel to each other and are connected in series to the parallel arm resonator (22p1) or the parallel arm resonator (22p2) in the one circuit. The the parallel arm resonator (22p2) comprises a resonance frequency that is different to the resonance frequency of the parallel arm resonator (22p1), and an anti-resonance frequency that is different to the anti-resonance frequency of the parallel arm resonator (22p1).
Inventors:
NOSAKA KOJI (JP)
Application Number:
PCT/JP2017/019787
Publication Date:
November 30, 2017
Filing Date:
May 26, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H7/46; H03H7/01; H03H9/64; H03H9/72; H04B1/38
Domestic Patent References:
| WO2014034222A1 | 2014-03-06 |
Foreign References:
| US20090251235A1 | 2009-10-08 | |||
| JP2016054374A | 2016-04-14 | |||
| JP2016072808A | 2016-05-09 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
Download PDF:
Previous Patent: POLYURETHANE COMPOSITION
Next Patent: HIGH-FREQUENCY FILTER DEVICE AND COMMUNICATION DEVICE
Next Patent: HIGH-FREQUENCY FILTER DEVICE AND COMMUNICATION DEVICE