Title:
ELASTIC WAVE DEVICE, HIGH-FREQUENCY FRONT END CIRCUIT, AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/056224
Kind Code:
A1
Abstract:
A variable filter (10) is provided with a parallel arm resonance circuit and a series arm resonance circuit. The parallel arm resonance circuit is provided with: a parallel arm resonator (p1) having an IDT electrode (121); and a frequency variable circuit (11) connected to the parallel arm resonator (p1). The frequency variable circuit (11) is provided with a capacitance element (C1) and a switch (SW). The variable filter (10) is further provided with a capacitance element (C2) connected between a series arm and the ground. The IDT electrode (121), IDT wiring connected to the IDT electrode (121), and capacitance wiring connected to capacitance element (C1) are formed on the same substrate. Wiring (141 or 144) among the capacitance wiring, and wiring (143) among the IDT wiring intersect. Capacitance element (C2) is formed by the capacitance wiring and the IDT wiring in the intersecting area.
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Inventors:
NOSAKA KOJI (JP)
Application Number:
PCT/JP2017/033566
Publication Date:
March 29, 2018
Filing Date:
September 15, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/145; H03H9/72; H04B1/00
Domestic Patent References:
| WO2014167752A1 | 2014-10-16 | |||
| WO2016111315A1 | 2016-07-14 |
Foreign References:
| JP2001069031A | 2001-03-16 | |||
| JP2000323961A | 2000-11-24 | |||
| JP2007259023A | 2007-10-04 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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