Signal processing circuit, and non-contact IC card and tag...

Details Signal processing circuit, and non-contact IC card and tag... Signal processing circuit, and non-contact IC card and tag...

2006-04-28

2008-10-21

Wimer, Michael C (Department: 2821)

Communications: radio wave antennas

Antennas

Spiral or helical type

C340S572700, C235S492000

Reexamination Certificate

active

07439933

ABSTRACT:
To provide an RFID (a signal processing circuit) equipped with a single rectangular spiral antenna and being capable of transmitting and receiving an electric power and signal by a plurality of frequency bands therewith, the present invention limits a longitudinal dimension (long sides) of the rectangular spiral antenna designed for transmission and reception of carrier of the HF band thereby to the length suitable for transmission and reception of carrier of the UHF band thereby as well as a widthwise dimension thereof so as to prevent a current waveform due to the carrier of the UHF band from reversing in phase at one of the long sides thereof.

REFERENCES:
patent: 6295029 (2001-09-01), Chen
patent: 7212124 (2007-05-01), Ohkawa et al.
patent: 2002/0005809 (2002-01-01), Manteuffel
patent: 2003/0117325 (2003-06-01), Jo, et al.
patent: 2005/0011961 (2005-01-01), Uesaka
patent: 0 886 232 (1998-12-01), None
patent: 05-290229 (1993-11-01), None
patent: 2004-240899 (2004-08-01), None
patent: 2004-297499 (2004-10-01), None

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