Title:
MULTIPLEXER, HIGH-FREQUENCY FRONT END CIRCUIT, AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/003296
Kind Code:
A1
Abstract:
A quadplexer (1) is provided with a filter (12) and a filter (22) having a higher passband frequency than the filter (12). The filter (12) has a ladder-type filter structure configured from series resonators (121s-125s) arranged on a first route and parallel resonators (121p-124p) arranged on a route connecting the first route and a ground. The series resonator (121s) closest to a shared terminal (Port1) among the series resonators (121s-125s) comprises IDT electrodes (32a and 32b) for exciting elastic waves and a reflector (32c) for reflecting the elastic waves excited by the IDT electrodes (32a and 32b). When the wavelength of the elastic waves determined by the electrode cycle of the IDT electrodes (32a and 32b) is denoted by λ, the distance between the IDT electrodes (32a and 32b) and the reflector (32c) is 0.44λ or more but less than 0.5λ.
Inventors:
TAKAMINE YUICHI (JP)
Application Number:
PCT/JP2017/017556
Publication Date:
January 04, 2018
Filing Date:
May 09, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/72; H03H9/145; H03H9/64; H04B1/00; H04B1/52
Domestic Patent References:
| WO2015080045A1 | 2015-06-04 |
Foreign References:
| JP2003032080A | 2003-01-31 | |||
| JPH10215144A | 1998-08-11 | |||
| JP2000261288A | 2000-09-22 |
Other References:
"Addressing Carrier Aggregation Challenges Using Multiplexer Solutions", WHITE PAPER, January 2016 (2016-01-01), XP055450575, Retrieved from the Internet [retrieved on 20170623]
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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