Antenna circuit for non-contact IC card and method of manufactur

Details Antenna circuit for non-contact IC card and method of manufactur Antenna circuit for non-contact IC card and method of manufactur

1992-04-13

1994-08-09

Hajec, Donald

Communications: radio wave antennas

Antennas

High frequency type loops

343745, 343895, H01Q 1112

Patent

active

053370635

ABSTRACT:
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.

REFERENCES:
patent: 3956751 (1976-05-01), Herman
patent: 4021705 (1977-05-01), Lichtblau
patent: 4864280 (1989-09-01), Meij
patent: 4922261 (1990-05-01), O'Farrell
patent: 4947180 (1990-08-01), Schotz
patent: 4947180 (1990-08-01), Schotz
patent: 5108822 (1992-04-01), Imaichi et al.
patent: 5128686 (1992-07-01), Tan et al.

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