Proximity detecting apparatus
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United States of America Patent
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Mar 24, 1992
Issued Date -
N/A
app pub date -
Dec 18, 1989
filing date -
Jul 18, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A proximity detection system which combines the advantages of an electrostatic (electric) field coupling mechanism with those of an electromagnetic coupling mechanism in order to overcome the disadvantages of the respective individual coupling mechanisms. The system includes a coded tag which is excited with an induction field, i.e., by using an electromagnetic coupling mechanism as has been done in the past in such proximity identification systems, but which transmits stored data back to the receiver using both an electric field coupling mechanism and an electromagnetic field coupling mechanism. The receiver, in turn, is provided with a novel preamplifier circuit arrangement, so that it can simultaneously receive signals via either or both of these coupling mechanisms.
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