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1. (WO2018180149) ANTENNA DEVICE AND ELECTRONIC INSTRUMENT

Pub. No.:    WO/2018/180149    International Application No.:    PCT/JP2018/007489
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Thu Mar 01 00:59:59 CET 2018
IPC: H01Q 7/00
G06K 7/10
H04B 5/02
Applicants: MURATA MANUFACTURING CO., LTD.
株式会社村田製作所
Inventors: ICHIKAWA Keiichi
市川 敬一
SUESADA Tsuyoshi
末定 剛
NASU Takafumi
那須 貴文
Title: ANTENNA DEVICE AND ELECTRONIC INSTRUMENT
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).