Title:
ANTENNA DEVICE AND ELECTRONIC APPARATUS
Document Type and Number:
WIPO Patent Application WO/2017/187862
Kind Code:
A1
Abstract:
An antenna device is provided with: a first coupling conductor that is connected to a power feeding circuit; a second coupling conductor that is at least magnetically coupled to the first coupling conductor; a first capacitor (C1) that is series-connected to the second coupling conductor; a second capacitor (C2) that is parallel-connected to a series circuit including the second coupling conductor and the first capacitor (C1); and a conductive member that is connected to the second capacitor (C2), and together with the second capacitor (C2), constitutes part or all of a closed loop. The capacitance of the first capacitor (C1) is smaller than the capacitance of the second capacitor (C2). Consequently, a coefficient of coupling to a coil antenna of a communication counterpart is increased and a good communication characteristic is obtained.
Inventors:
TENNO NOBUYUKI (JP)
ITO HIROMITSU (JP)
ITO HIROMITSU (JP)
Application Number:
PCT/JP2017/012282
Publication Date:
November 02, 2017
Filing Date:
March 27, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H01Q7/00; H01Q1/24
Domestic Patent References:
| WO2007119310A1 | 2007-10-25 | |||
| WO2012111430A1 | 2012-08-23 | |||
| WO2007125683A1 | 2007-11-08 | |||
| WO2014098024A1 | 2014-06-26 | |||
| WO2012153691A1 | 2012-11-15 |
Foreign References:
| JP2013168756A | 2013-08-29 |
Attorney, Agent or Firm:
KAEDE PATENT ATTORNEYS' OFFICE (JP)
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