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1. (WO2013161608) COIL ANTENNA AND COMMUNICATION TERMINAL DEVICE

Pub. No.:    WO/2013/161608    International Application No.:    PCT/JP2013/061185
Publication Date: Fri Nov 01 00:59:59 CET 2013 International Filing Date: Tue Apr 16 01:59:59 CEST 2013
IPC: H01Q 7/08
H01Q 1/24
H04M 1/02
Applicants: MURATA MANUFACTURING CO., LTD.
株式会社村田製作所
Inventors: TSUBAKI Nobuhito
椿 信人
NOMA Takashi
野間 隆嗣
KATO Noboru
加藤 登
Title: COIL ANTENNA AND COMMUNICATION TERMINAL DEVICE
Abstract:
In order to make it possible to minimize conductor loss and obtain a sufficient communication distance at the same time, a coil antenna is provided with: a magnetic body core (1) having a first peripheral surface including at least a first principal surface; a first coil conductor (2) formed on the first peripheral surface so as to be wound around a predetermined winding axis; a first base material layer (3), which is layered on the first principal surface, has at least a first surface substantially parallel to the first principal surface, and comprises a material having a lower permeability than that of the magnetic body core; and a second coil conductor (4) formed on at least the first surface. Both ends of the second coil conductor (4) are connected to the first coil conductor (2) on the first principal surface, and the direction in which a current flows through the first coil conductor (2) on the first principal surface and the direction in which a current flows through the second coil conductor on the first surface are substantially identical.