Loop antenna device

Details Loop antenna device Loop antenna device

2006-11-28

2006-11-28

Le, Hoanganh (Department: 2821)

Communications: radio wave antennas

Antennas

High frequency type loops

C343S867000, C343S842000

Reexamination Certificate

active

07142163

ABSTRACT:
A plurality of small loop antenna cells61, 62and63are magnetically coupled to an antenna coil8of a non-contact type data carrier3.In the plurality of small loop antenna cells, the directions of the magnetic moments of the signals transmitted to the non-contact type data carrier3are opposite to each other, the sum of the magnetic moments generated from all the small loop antenna cells61to63is zero and a conductor forming a short ring pattern67is provided collectively for the plurality of small loop antenna cells. Thus, imbalance caused between the small loop antenna cells61to63can be compensated for by the short ring pattern67.

REFERENCES:
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patent: 4751516 (1988-06-01), Lichtblau
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patent: 5602556 (1997-02-01), Bowers
patent: 5663738 (1997-09-01), Mueller
patent: 5963173 (1999-10-01), Lian et al.
patent: 2164824 (1986-03-01), None
patent: 10-209737 (1998-08-01), None

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