Interrogator circuit arrangement
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United States of America Patent
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-
Apr 4, 2000
Grant Date -
N/A
app pub date -
Aug 7, 1997
filing date -
Aug 8, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An interrogator circuit (2) for use with a semi-passive transponder (30) of a type which reflectively modulates an incoming signal (28) is described. The circuit (2) comprises an antenna (4), a transistor (8), a matching network (6) connecting to the antenna (4) to an input of the transistor and means (12, 14) for operating the transistor such that it self-oscillates and radiates power (28) from the antenna (4) and simultaneously acts as a self-oscillating mixer to produce an output (40) which is representative of the modulation of a signal 32 received at the antenna. For an efficient conversion gain the reflection coefficient of the antenna (4) is configured to be low when the circuit is in a stable self-oscillating condition.
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