Warning apparatus using microwaves
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United States of America Patent
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Jun 8, 1982
Grant Date -
N/A
app pub date -
Jun 18, 1980
filing date -
Jun 29, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A warning apparatus comprises a Gunn oscillator, a transmitting antenna, a receiving antenna, a detector, and a comparator which produces a detecting signal when the output signal from the detector is belowed a reference level. The warning apparatus further comprises a drive circuit for applying a rectangular pulse voltage to the Gunn oscillator, a band-pass filter allowing only a microwave with the transmitting frequency band of microwaves received by the receiving antenna to pass therethrough, and a signal generator for applying the reference signal, which changes in accordance with the output signal of the detector, to the comparator.
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