Title:
MULTIPLEXER, HIGH-FREQUENCY FRONT-END CIRCUIT, AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/181111
Kind Code:
A1
Abstract:
In the present invention, harmonic distortion of a transmission signal is reduced while manufacturing variation is suppressed. A multiplexer (1) is provided with an antenna common terminal (11), a first filter (transmission filter (2)), and a second filter (reception filter (3)). The first filter is a ladder type filter that includes a plurality of resonators (first to fourth serial arm resonators (21)-(24) and first to third parallel arm resonators (25)-(27)) having IDT electrodes. The IDT electrode of a resonator (first serial arm resonator (21)) connected closest to the antenna common terminal (11), of the plurality of resonators in the first filter, has a plurality of electrode finger blocks. Of the plurality of electrode finger blocks, at least two electrode finger blocks have mutually different electrode finger duty ratios that indicate the ratio of the width of an electrode finger with respect to an electrode finger pitch.
Inventors:
KANAZAWA TOMIO
SHIMIZU HIROSHI
SHIMIZU HIROSHI
Application Number:
PCT/JP2018/012005
Publication Date:
October 04, 2018
Filing Date:
March 26, 2018
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/145; H03H9/64; H03H9/72
Domestic Patent References:
| WO2015080278A1 | 2015-06-04 |
Foreign References:
| JP2010104031A | 2010-05-06 | |||
| JP2014013959A | 2014-01-23 |
Attorney, Agent or Firm:
HOKUTO PATENT ATTORNEYS OFFICE (JP)
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