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Title:
ELASTIC WAVE FILTER DEVICE AND COMPLEX FILTER DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/021949
Kind Code:
A1
Abstract:
An elastic wave filter device is provided that achieves both improvement in filter characteristics, such as the amount of out-of-band attenuation, and reduction of insertion loss.　A bandpass filter 1 is constructed on a piezoelectric substrate 3. The bandpass filter 1 includes first and second vertically coupled resonator-type elastic wave filters 11, 12. A second vertically coupled resonator-type elastic wave filter 12 is vertically connected to a first vertically coupled resonator-type elastic wave filter 11. A first ground electrode 7 and a second ground electrode 8 are provided on the piezoelectric substrate 3. The first ground electrode 7 and the second ground electrode 8 are not electrically connected on the piezoelectric substrate 3. In at least one of the first and second vertically coupled resonator-type elastic wave filters 11, 12, an IDT electrode 12c positioned at the center of a plurality of IDT electrodes includes a first interdigitated electrode 12c1 connected to a signal potential, and second and third interdigitated electrodes 12c2, 12c3 connected to a ground potential. The second interdigitated electrode 12c2 is connected to the first ground electrode 7. The third interdigitated electrode 12c3 is connected to the second ground electrode 8.

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Inventors:
NAKAMURA SHINICHI (JP)
Application Number:
PCT/JP2022/028890
Publication Date:
February 23, 2023
Filing Date:
July 27, 2022
Export Citation:
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Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H9/145; H03H9/25; H03H9/72
Domestic Patent References:
WO2007129548A12007-11-15
Foreign References:
JP2007123992A2007-05-17
JP2007124085A2007-05-17
JP2015002375A2015-01-05
Attorney, Agent or Firm:
OSAKA FRONT (JP)
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