Title:
MULTIPLEXER
Document Type and Number:
WIPO Patent Application WO/2021/200700
Kind Code:
A1
Abstract:
Provided is a multiplexer in which intermodulation distortion (IMD) is reduced and degradation of sensitivity of a reception filter is suppressed. In a multiplexer 1, a first transmission filter 11, a second transmission filter 13, and a first reception filter 12 each comprising a plurality of resonators are commonly connected to a common terminal 2. When the first transmission filter has a passband Tx1, the second transmission filter has a passband Tx2, the first reception filter has a passband Rx1, and the passbands have a central frequency of Tx1c, Tx2c, and Rx1c, respectively, Tx1c < Rx1c < Tx2c. The resonator of the first reception filter 12 that is the closest to the common terminal 2 is a series-arm resonator S11. When the resonator of the second transmission filter 13 that is the closest to the common terminal 2 has an electrode finger pitch p(Tx2) of an IDT electrode, and the series-arm resonator S11 of the first reception filter 12 that is the closest to the common terminal 2 has an electrode finger pitch pS1(Rx1) of an IDT electrode, a pitch ratio expressed by pS1(Rx1)/p(Tx2) is greater than 1 and not greater than 1.035.
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Inventors:
TANIGUCHI YASUMASA (JP)
Application Number:
PCT/JP2021/013004
Publication Date:
October 07, 2021
Filing Date:
March 26, 2021
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/145; H03H9/64; H03H9/72
Domestic Patent References:
| WO2018003297A1 | 2018-01-04 | |||
| WO2018070273A1 | 2018-04-19 | |||
| WO2017073425A1 | 2017-05-04 | |||
| WO2019188007A1 | 2019-10-03 |
Foreign References:
| JP2019041307A | 2019-03-14 |
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (JP)
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