Double superheterodyne type microwave detector capable of detecting leaked microwaves
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United States of America Patent
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Oct 24, 2000
Grant Date -
N/A
app pub date -
Sep 17, 1999
filing date -
Sep 24, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A double superheterodyne type microwave detector is constructed from a reception antenna; a first local oscillator; a second local oscillator; reception means for detecting microwaves having prescribed frequencies based on signals obtained by carrying out a first mixing in which the output of the first local oscillator is mixed with the microwaves picked up by the antenna, and a second mixing in which the signals obtained from the first mixing are mixed with the output of the second local oscillator; judgement means for judging whether or not an actual microwave signal which forms a detection target has been detected by the reception means; alarm means for outputting an alarm when the judgement means judges an actual microwave signal to have been received by the reception means; and first control means for suspending the first mixing when the reception means detects a microwave signal having a prescribed frequency; wherein the judgement of whether or not the prescribed frequency microwave signal detected by the reception means is an actual microwave signal is carried out based on information obtained by the judgement means after the first mixing is suspended.
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