ANTENNA COIL AND RFID-USE TAG USING IT, TRANSPONDER-USE ANTENNA

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(11)

EP 1 439 608 A8

(12)	CORRECTED EUROPEAN PATENT APPLICATION
	published in accordance with Art. 158(3) EPC

(48)	Corrigendum issued on:
	20.10.2004 Bulletin 2004/43

(43)	Date of publication:
	21.07.2004 Bulletin 2004/30

(21)	Application number: 02800249.1

(22)	Date of filing: 26.09.2002

(51)	International Patent Classification (IPC)⁷: H01Q 7/06, H01Q 1/38, B42D 15/10, G06K 19/00, G08B 13/24

(86)	International application number:
	PCT/JP2002/009955

(87)	International publication number:
	WO 2003/030300 (10.04.2003 Gazette 2003/15)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

28.09.2001 JP 2001303050
03.12.2001 JP 2001368241

(71)	Applicant: MITSUBISHI MATERIALS CORPORATION
	Chiyoda-ku, Tokyo 100-8117 (JP)

(72)	Inventors:
	ENDO, Takanori, Mitsubishi Materials Corporation Bunkyo-ku, Tokyo 112-0002 (JP) YAHATA, Seiro, Mitsubishi Materials Corporation Bunkyo-ku, Tokyo 112-0002 (JP) TSUCHIDA, Takashi, Mitsubishi Materials Corp. Bunkyo-ku, Tokyo 112-0002 (JP) YONEZAWA, Tadashi, Mitsubishi Materials Corp. Bunkyo-ku, Tokyo 112-0002 (JP)

(74)	Representative: HOFFMANN - EITLE
	Patent- und Rechtsanwälte Arabellastrasse 4 81925 München 81925 München (DE)

(54)	ANTENNA COIL AND RFID-USE TAG USING IT, TRANSPONDER-USE ANTENNA

(57) An antenna coil 10 comprises an air-core coil 12 which is wound helically in a plane and a plate magnetic core member 13 which is inserted in the air-core coil 12 so as to be approximately parallel with a plane of the air-core coil 12. The magnetic core member 13 is formed by a soft magnetic metal, an amorphous or ferrite, or a composite member of a powder, flake and plastic, or rubber. The magnetic core member 13 is formed by performing an injection molding operation or a compressing molding operation of the composite member. Alternatively, the magnetic core member 13 is a magnetic coating which is formed by applying and drying the composite member. A non-magnetic conductive plate 14 which has a conductivity is layered on a surface of the air-core coil 12 through which the magnetic core member 13 is inserted. The conductive plate 14 is made of a copper, a copper alloy, an aluminum or an aluminum alloy having 0.01 to 2 mm thickness. By doing this, it is operated by relatively high frequency while it is rigid relatively.