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.
