Metal compensated radio frequency identification reader
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Oct 23, 2001
Grant Date -
N/A
app pub date -
Jun 13, 2000
filing date -
Jun 13, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention features an improved radio frequency identification (RFID) reader which operates with a low power consumption and which may tolerate a wide fluctuation in input voltages. The RFID reader is housed so that the influence of its physical surroundings, especially metallic objects, on system performance is minimized. A pre-compensation metal plate is used to stabilize the self-resonant frequency of the reader, even in the presence of large metal masses. The pre-compensation plate may be formed from aluminum or another non-ferrous material or, for long-range RFID readers, from ferrite or another similar, high magnetically permeable material. In addition, the RFID reader features improved sensitivity so that the effective operating distance is maximized. Also, the operating frequency is dynamically controlled in discrete steps of 10 Hz or less so that the effects of component parameter drift, temperature change, or other external factors are minimized. The RFID reader also automatically adapts itself to the requirements of an external access control system to which it is attached.
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