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Patent Searching and Data


Title:
BIDIRECTIONAL COUPLER
Document Type and Number:
WIPO Patent Application WO/2018/174042
Kind Code:
A1
Abstract:
The purpose of the present invention is to perform bidirectional detection while suppressing an increase in return loss at an output terminal. A bidirectional coupler is provided with: a detection port; a main line connected to a first port and a second port; a sub-line; a terminal circuit; a switch circuit for connecting one end and another end of the sub-line respectively to the terminal circuit or the detection port; and a matching circuit which is disposed between the switch circuit and the detection port, and which includes a first variable capacitor, a first variable inductor, and/or a first variable resistor. In a first mode for detecting a first signal, the switch circuit connects the one end of the sub-line to the detection port and connects the other end to the terminal circuit. In a second mode for detecting a return signal of the first signal, the switch circuit connects the one end of the sub-line to the terminal circuit and connects the other end to the detection port. Depending on the operation mode or the frequency band of the first signal, the capacitance value of the first variable capacitor, the inductance value of the first variable inductor, and/or the resistance value of the first variable resistor is controlled.

Inventors:
KIM RYANGSU (JP)
SHIMIZU KATSUYA (JP)
SHIGENO YASUSHI (JP)
TOKUDA DAISUKE (JP)
FUKASAWA MIKIKO (JP)
Application Number:
PCT/JP2018/010963
Publication Date:
September 27, 2018
Filing Date:
March 20, 2018
Export Citation:
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Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H01P5/18; H04B1/04
Foreign References:
US20160065167A12016-03-03
JP2006157095A2006-06-15
US20170026020A12017-01-26
US20150091668A12015-04-02
Attorney, Agent or Firm:
INABA, Yoshiyuki et al. (JP)
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