Title:
ELASTIC WAVE FILTER AND MULTIPLEXER
Document Type and Number:
WIPO Patent Application WO/2023/037925
Kind Code:
A1
Abstract:
This elastic wave filter (1) comprises: a first filter circuit (10) provided to a first route (r1) linking a first terminal (T1) and a second terminal (T2); and an additional circuit (20) provided to a second route (r2) connected in parallel to the first route (r1). A longitudinally-coupled elastic wave resonator (25) of the additional circuit (20) has a plurality of IDT electrodes (31-34). Where a frequency calculated from the arrangement pitch (p) of electrode fingers (36) of the IDT electrodes (31, 33) connected toward the first terminal (T1) is fix, a frequency calculated from the arrangement pitch (p) of electrode fingers (36) of the IDT electrodes (32, 34) connected toward the second terminal (T2) is fox, the highest frequency in a passband of the first filter circuit (10) is fH1, and a prescribed frequency in an attenuation band of the first filter circuit (10) is fH2, the variables have the relationship wherein 1.055 × fH1 < fix and the relationship where 1.035 × fH1 < fox < fH2.
Inventors:
YAMAJI, Toru (JP)
MATSUI, Hideki (JP)
MATSUI, Hideki (JP)
Application Number:
PCT/JP2022/032490
Publication Date:
March 16, 2023
Filing Date:
August 30, 2022
Export Citation:
Assignee:
MURATA MANUFACTURING CO., LTD. (JP)
International Classes:
H03H9/145; H03H9/64; H03H9/72
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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