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Title:
ELASTIC WAVE DEVICE AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2018/043496
Kind Code:
A1
Abstract:
Provided is an elastic wave device that can easily perform frequency adjustment of a plurality of band-pass-type filers configured on the same piezoelectric substrate. An elastic wave device 1 is provided with: a first band-pass-type filter configured on a piezoelectric substrate 7, having a plurality of first IDT electrodes 9A and a first dielectric film 16A, a first transmission band or a first reception band being used as a pass band; and a second band-pass-type filter configured on the piezoelectric substrate 7, having a plurality of second IDT electrodes 9B and a second dielectric film 16B, a second transmission band or a second reception band being used as the pass band. At least one of the first and second IDT electrodes 9A, 9B or the first and second dielectric films 16A, 16B, have the same film thickness, and comprise the same material. When the frequency of the end part of the first transmission band is Tx1, the frequency of the end part of the first reception band is Rx1, the center frequency of the pass band of the first band-pass-type filter is f1, the frequency of the end part of the second transmission band is Tx2, the frequency of the end part of the second reception band is Rx2, and the center frequency of the pass band of the second band-pass-type filter is f2, |Tx1 – Rx1|/f1 > |Tx2 – Rx2|/f2, and the weighted average value of the duty of the plurality of first IDT electrodes 9A is greater than the weighted average value of the duty of the plurality of second IDT electrodes 9B.

Inventors:
YASUDA, Junpei (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
Application Number:
JP2017/030969
Publication Date:
March 08, 2018
Filing Date:
August 29, 2017
Export Citation:
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Assignee:
MURATA MANUFACTURING CO., LTD. (10-1, Higashikotari 1-chome Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
International Classes:
H03H9/145; H03H3/10; H03H9/64; H03H9/72
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (Chuo Odori FN Bldg, 3-8 Tokiwamachi 1-chome, Chuo-ku, Osaka-sh, Osaka 28, 〒5400028, JP)
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