Title:
ANTENNA DEVICE, CARD-TYPE COMMUNICATIONS DEVICE, AND COMMUNICATIONS TERMINAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/114998
Kind Code:
A1
Abstract:
To suppress reduction in the Q values of a coil antenna, reduce noise, and avoid generation of a null state. An antenna device, comprising: an antenna resonance circuit (12) connected to a power supply circuit (11); and a variable frequency resonance element (21) including a resonance circuit that couples with the antenna resonance circuit (12) via an electromagnetic field, and having a resonance frequency for the resonance circuit that is variable within a prescribed frequency range.
Inventors:
IKEMOTO NOBUO (JP)
NAKAISO TOSHIYUKI (JP)
GOUCHI NAOKI (JP)
IKEDA NAOTO (JP)
NAKAISO TOSHIYUKI (JP)
GOUCHI NAOKI (JP)
IKEDA NAOTO (JP)
Application Number:
PCT/JP2013/051132
Publication Date:
August 08, 2013
Filing Date:
January 22, 2013
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H01Q3/44; G06K17/00; G06K19/07; G06K19/077; H01Q1/38; H01Q7/00
Foreign References:
| JPH032711U | 1991-01-11 | |||
| JP2006121444A | 2006-05-11 |
Attorney, Agent or Firm:
PROFIC PC (JP)
Patent business corporation pro フィック patent firm (JP)
Patent business corporation pro フィック patent firm (JP)
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Claims: