Title:
ELASTIC WAVE FILTER DEVICE, MULTIPLEXER, HIGH-FREQUENCY FRONT END CIRCUIT, AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/003268
Kind Code:
A1
Abstract:
Provided is a ladder-type elastic wave filter device (21) comprising parallel resonators (151-154) and series resonators (101-105) configured from an IDT electrode (22) that is formed on a substrate (220) having a piezoelectric layer (227). In the parallel resonators (152 and 153) excluding the parallel resonator (151) connected closest to an input power terminal (100) and the parallel resonator (154) connected closet to an output power terminal (120) among the parallel resonators (151-154), the anti-resonance frequency fap152 of the parallel resonator (152) is lower than the anti-resonances frequencies fap151 and fap154 of the parallel resonators (151 and 154), and the anti-resonance frequency fap153 of the parallel resonator (153) is higher than the anti-resonance frequencies fap151 and fap154 of the parallel resonators (151 and 154).
Inventors:
TAKAMINE YUICHI (JP)
Application Number:
PCT/JP2017/016619
Publication Date:
January 04, 2018
Filing Date:
April 26, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H9/145; H03H9/72; H04B1/50
Domestic Patent References:
| WO2015080045A1 | 2015-06-04 |
Foreign References:
| JP2011114826A | 2011-06-09 | |||
| JP2005045475A | 2005-02-17 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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