Title:
MULTIPLEXER, HIGH-FREQUENCY FRONT END CIRCUIT, AND COMMUNICATION TERMINAL
Document Type and Number:
WIPO Patent Application WO/2018/012275
Kind Code:
A1
Abstract:
According to the present invention, an attenuation amount necessary for a specific frequency band outside a passband is obtained even when frequency characteristics are changed according to a plurality of communication bands. A multiplexer (1) is provided with a transmission filter (10), a reception filter (60), and a common connection point (PC). At the common connection point (PC), an antenna-side end of the transmission filter (10) and an antenna-side end of the reception filter (60) are connected to each other. The transmission filter (10) is provided with: a plurality of resonators including a parallel arm resonator (121); and a variable capacitor connected in series with the parallel arm resonator (121). An inductor (80) for forming an attenuation pole is provided between the antenna-side end of the reception filter (60) and the common connection point (PC). The inductor (80) for forming an attenuation pole and the reception filter (60) which is capacitive form an attenuation pole at a frequency close to or identical to a specific frequency outside the passband of a transmission signal.
Inventors:
TANI MASAKAZU (JP)
Application Number:
PCT/JP2017/023482
Publication Date:
January 18, 2018
Filing Date:
June 27, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/72; H03H7/46; H04B1/52
Domestic Patent References:
| WO2010058544A1 | 2010-05-27 |
Foreign References:
| JP2010021914A | 2010-01-28 | |||
| JP2016504872A | 2016-02-12 | |||
| US20140355497A1 | 2014-12-04 | |||
| JP2014511626A | 2014-05-15 | |||
| JP2014502803A | 2014-02-03 | |||
| JP2009207116A | 2009-09-10 |
Attorney, Agent or Firm:
KAEDE PATENT ATTORNEYS' OFFICE (JP)
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