Title:
ANTENNA DEVICE AND ELECTRONIC INSTRUMENT
Document Type and Number:
WIPO Patent Application WO/2018/180149
Kind Code:
A1
Abstract:
An antenna device (101A) comprising: a primary-side circuit (1) that is connected to a transceiver (IC9) having a reader/writer function, and has a primary coil (L1); and a secondary-side circuit (2) that has an electrically conductive member (20), a secondary coil, and a secondary-side capacitor (C2). Magnetic field coupling is carried out for the primary coil (L1) and the secondary coil (L2). Each of the electrically conductive member (20), the secondary coil (L2), and the secondary-side capacitor (C2) is connected in parallel, and as seen from two branch points (CN1, CN2) of the parallel connection, the reactance of a current path (CP) passing through the secondary coil (L2) is inductive, and the inductance of the secondary coil (L2) is greater than the inductance of the electrically conductive member (20). The inductance of the electrically conductive member (20) and the secondary-side capacitor (C2) constitute a secondary-side resonance circuit (RC2).
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Inventors:
ICHIKAWA KEIICHI (JP)
SUESADA TSUYOSHI (JP)
NASU TAKAFUMI (JP)
SUESADA TSUYOSHI (JP)
NASU TAKAFUMI (JP)
Application Number:
PCT/JP2018/007489
Publication Date:
October 04, 2018
Filing Date:
February 28, 2018
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H01Q7/00; G06K7/10; H04B5/02
Domestic Patent References:
| WO2017006921A1 | 2017-01-12 | |||
| WO2014003163A1 | 2014-01-03 | |||
| WO2000027137A1 | 2000-05-11 |
Foreign References:
| JP2009171070A | 2009-07-30 | |||
| EP1760629A2 | 2007-03-07 | |||
| JP2011228841A | 2011-11-10 |
Attorney, Agent or Firm:
KAEDE PATENT ATTORNEYS' OFFICE (JP)
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