Radio frequency antenna for an object interrogation device...

Details Radio frequency antenna for an object interrogation device... Radio frequency antenna for an object interrogation device...

2005-05-17

2005-05-17

Ho, Tan (Department: 2821)

Communications: radio wave antennas

Antennas

Spiral or helical type

C343S787000, C340S572200

Reexamination Certificate

active

06894660

ABSTRACT:
A transmission/reception radio-wave aerial for an interrogation device for electronic labels carried by objects, the transmission/reception radio-wave aerial being tuned to an F0frequency and each electronic label including a radio-wave aerial tuned to the F0frequency and being associated with an electronic circuit, wherein the transmission/reception radio-wave aerial is arranged to create a magnetic field which modifies the tuning frequency for the radio-wave aerials for the electronic labels in such a way to retune towards the F0frequency of the aerial of the interrogation device.

REFERENCES:
patent: 4745401 (1988-05-01), Montean
patent: 5420579 (1995-05-01), Urbas et al.
patent: 5623271 (1997-04-01), Ponnapalli
patent: 6164551 (2000-12-01), Altwasser
patent: 6252508 (2001-06-01), Vega et al.
patent: 6335686 (2002-01-01), Goff et al.
patent: 6480110 (2002-11-01), Lee et al.
patent: 6714120 (2004-03-01), Blama et al.
patent: 0 610 546 (1994-08-01), None
patent: WO 9805171 (1998-02-01), None

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