Loop antenna and electronic equipment including loop antenna

Details Loop antenna and electronic equipment including loop antenna Loop antenna and electronic equipment including loop antenna

2006-03-08

2008-12-02

Kim, Ahshik (Department: 2876)

Registers

Records

Conductive

C235S487000, C235S488000

Reexamination Certificate

active

07458518

ABSTRACT:
The present invention is intended to improve the receiving performance of a loop antenna to be connected to an IC chip that is incorporated in an IC card or a portable cellular phone. A loop antenna that is connected to an IC chip which has a CPU and a memory mounted thereon and which is incorporated in a casing, and that transmits or receives predetermined electromagnetic waves to or from a reader writer includes a main loop antenna and at least one sub-loop antenna disposed away from the main loop antenna. The sub-loop antenna is connected to the IC chip in parallel with or in series with the main loop antenna. A transmission/reception frequency at which the sub-loop antenna transmits or receives electromagnetic waves may be different from the one at which the main loop antenna transmits or receives electromagnetic waves.

REFERENCES:
patent: 5422650 (1995-06-01), Hill
patent: 2005/0264460 (2005-12-01), Sunaga
patent: 2000-269725 (2000-09-01), None
patent: 2003-085519 (2003-03-01), None
Youbok Lee—“Antenna Circuit Design for RFID Applications” published by Microchip Technologies Inc. on 2003.

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