Title:
MULTIPLEXER, HIGH-FREQUENCY FRONT END CIRCUIT, AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/003297
Kind Code:
A1
Abstract:
In this quadplexer (1), the filter (12) of a duplexer (10) has a lower passband frequency than the filter (22) of a duplexer (20), a series resonator (121s) closest to a shared terminal (Port1) of the filter (12) is configured from split resonators (121sa-121sc), each of the split resonators (121sa-121sc) is an elastic wave resonator comprising an IDT electrode (32a) and a reflector (32c), said split resonators (121sa-121sc) include first and second split resonators (121sa-121sc) having different ripples in impedance characteristics in a predetermined frequency range, the predetermined frequency range is in a range higher than the anti-resonance frequency of the series resonator (121s) closest to the shared terminal (Port1), and said predetermined frequency range is defined by the pitches of a plurality of electrode fingers (322c) constituting the reflectors (32c) and is included in the passband of the filter (22).
Inventors:
TAKAMINE YUICHI (JP)
Application Number:
PCT/JP2017/017560
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 | |||
| WO2012032832A1 | 2012-03-15 |
Foreign References:
| JP2000261288A | 2000-09-22 | |||
| JPH0576122U | 1993-10-15 | |||
| JPH07131291A | 1995-05-19 | |||
| JP2003032080A | 2003-01-31 |
Other References:
"Addressing Carrier Aggregation Challenges Using Multiplexer Solutions", WHITE PAPER, QORVO, January 2016 (2016-01-01), pages 3 - 6, Retrieved from the Internet [retrieved on 20170623]
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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