Title:
アンテナ装置および通信端末装置
Document Type and Number:
Japanese Patent JP5454742
Kind Code:
B2
Abstract:
An antenna device includes an antenna element and an impedance conversion circuit connected to the antenna element. The impedance conversion circuit is inserted between the antenna element and a feeding circuit, and includes a first series circuit where a first coil conductor and a second coil conductor are connected in series, and a second series circuit where a third coil conductor and a fourth coil conductor are connected in series. The first and second coil conductors define a closed magnetic circuit through which a closed loop of a first magnetic flux passes, and the third and fourth coil conductors define a closed magnetic circuit through which a closed loop of a second magnetic flux passes. Consequently, the antenna device performs impedance matching with the feeding circuit in a wide frequency band.
Inventors:
Tokiko Kato
Tsutomu Ieki
Tsutomu Ieki
Application Number:
JP2013517954A
Publication Date:
March 26, 2014
Filing Date:
May 17, 2012
Export Citation:
Assignee:
MURATA MANUFACTURING CO.,LTD.
International Classes:
H03H7/38; H01F19/00; H04B1/04
Domestic Patent References:
| JP2010510706A | 2010-04-02 | |||
| JPH0380509A | 1991-04-05 | |||
| JP2012085305A | 2012-04-26 | |||
| JP2012084833A | 2012-04-26 | |||
| JP2012085250A | 2012-04-26 | |||
| JP2010510706A | 2010-04-02 | |||
| JPH0380509A | 1991-04-05 | |||
| JP2012085305A | 2012-04-26 | |||
| JP2012084833A | 2012-04-26 | |||
| JP2012085250A | 2012-04-26 |
Attorney, Agent or Firm:
Kaede International Patent Office