Title:
ANTENNA MATCHING CIRCUIT, ANTENNA DEVICE, AND COMMUNICATION TERMINAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2016/114182
Kind Code:
A1
Abstract:
This antenna device (101) is provided with: an impedance conversion circuit (2) connected to a power supply circuit (9); an impedance-conversion-ratio adjustment circuit (3); and an antenna (1). The impedance conversion circuit (2) includes a first inductance element (L1) and a second inductance element (L2) which are magnetic field coupled to each other, and forms an autotransformer-type circuit. The impedance-conversion-ratio adjustment circuit (3) includes a third inductance element (L3) connected in series between the impedance conversion circuit (2) and an antenna port (P2), and a capacitance element (C3) shunt connected between the antenna port (P2) and a ground, and corrects the impedance conversion ratio of the impedance conversion circuit (2) in accordance with the frequency band.
Inventors:
ISHIZUKA KENICHI (JP)
Application Number:
PCT/JP2016/050184
Publication Date:
July 21, 2016
Filing Date:
January 06, 2016
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H04B1/40; H01Q1/50; H03H7/38; H04B1/04; H04B1/18
Domestic Patent References:
| WO2012114983A1 | 2012-08-30 | |||
| WO2012153654A1 | 2012-11-15 |
Foreign References:
| JP2013168892A | 2013-08-29 |
Attorney, Agent or Firm:
Kaede Patent Attorneys' Office (JP)
Patent business corporation Kaede Patent Attorneys' Office (JP)
Patent business corporation Kaede Patent Attorneys' Office (JP)
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