Arrangement interrogation unit for transponder
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United States of America Patent
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Aug 22, 1995
Issued Date -
N/A
app pub date -
Jan 19, 1993
filing date -
Jul 31, 1987
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An interrogation unit which has a control circuit and an RF oscillator is described. The interrogation unit further has a transmitter which receives the output of the RF oscillator and transmits at least one RF interrogation pulse of a first frequency for interrogating the responder unit, causing the responder unit to return read data in the form of a RF response. Also in the interrogation unit is a switch for disabling the output of said transmitter and enabling reception of the RF response upon termination of the RF interrogation signal. The interrogation unit still further has a receiver for receiving the RF response upon termination of the RF interrogation pulse and an interrogation unit demodulator for demodulation of the read data from said RF response.
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