05337063 is referenced by 254 patents and cites 12 patents.

An antenna circuit for a non-contact IC card exchanges signals with an external device utilizing electromagnetic waves. The antenna circuit includes a coil and a capacitor connected to form a resonant circuit. The coil includes a main coil having a spiral conductive pattern disposed on a peripheral portion of a substrate and a plurality of adjusting patterns, each electrically connecting a portion of the conductive pattern corresponding to a desired number of turns of the main coil to an end of the main coil. The plurality of adjusting patterns are disconnected from the main coil, except for one adjusting pattern, to obtain a coil of desired inductance.

Title
Antenna circuit for non-contact IC card and method of manufacturing the same
Application Number
7/867538
Publication Number
5337063
Application Date
April 13, 1992
Publication Date
August 9, 1994
Inventor
Kenichi Takahira
Itami
JP
Agent
Leydig Voit & Mayer
Assignee
Mitsubishi Denki Kabushiki Kaisha
JP
IPC
H01Q 11/12
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