ANTENNA COIL AND TRANSMISSION ANTENNA

WIPO Patent Application WO/2003/036760

A1

In a transmission antenna comprising an antenna coil that has a core around which a coil wire are wound and a capacitor that is connected to the coil wire and forms a series resonant circuit along with the inductance of the antenna coil, the antenna coil has a coupling member comprising a screw that is a small−sized core smaller than the foregoing core and a screw hole that magnetically couples the screw with the foregoing core. The screw hole is a nonmagnetic distance adjusting unit capable of adjusting the distance between the screw and the foregoing core. The antenna coil establishes a resonant frequency by adjusting the amount by which the screw is screwed.

WO/2000/030210	SMARTCARD MODULE AND METHOD OF ATTACHING ANTENNA WIRES THERETO
JP4633019	Antenna built-in plate
JP2000508490	[Title of the Invention] A small RF transmitter without an external antenna.

OKAMURA SHINJI (JP)

PCT/JP2001/009251

May 01, 2003

October 22, 2001

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SUMIDA CORP (JP)
SUMIDA TECNOLOGIES INC (JP)
OKAMURA SHINJI (JP)

H01Q1/22; H01Q1/24; H01Q1/32; H01Q1/36; H01Q7/00; H01Q7/06; H01Q7/08; H01Q11/08; H01Q21/29; (IPC1-7): H01Q7/06

JPS59152703A	1984-08-31
JP2001257526A	2001-09-21
JPS59191905A	1984-10-31

Honda, Takashi (8F 1-17 Akasaka 1-chome Minato-ku, Tokyo, JP)

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