Communications: electrical – Vehicle detectors
Reexamination Certificate
2005-05-17
2005-05-17
La, Anh V. (Department: 2636)
Communications: electrical
Vehicle detectors
C340S572500, C340S010100, C340S010300, C340S010400
Reexamination Certificate
active
06894624
ABSTRACT:
A passive transponder identification system and credit card type transponder are disclosed, particularly, the transponder identification system to utilize a transmitting manner of two different RF signals is provided. The present invention directly relates to a passive transponder without any kind of power source. Therefore, the present invention has advantages of having a constant gain value by developing a high-gain dual polarizing antenna for a small credit card type passive transponder to identify at long distance, independently to any direction of the transponder; improving gain values than conventional transponder tag antenna by 6-9 dB to ensure a sub-permanent life time by providing the desired identification performance by a small credit card type passive transponder without power supply; and being applicable to any systems to identify and distinguish high-speed moving objects.
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patent: 6144332 (2000-11-01), Reindl et al.
patent: 6483427 (2002-11-01), Werb
Jeong Dong-Seog
Kim Ji-Tae
Credipass Co., Ltd.
La Anh V.
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