Microwave Sensor
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United States of America Patent
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N/A
Issued Date -
Jul 10, 2008
app pub date -
Dec 26, 2005
filing date -
Jan 7, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
According to one embodiment, a microwave sensor includes: a first directional coupler (DC1) connected on a path of a transmission antenna unit (A1); a second directional coupler (DC2) connected on a path of a reception antenna unit (A2), and a determination unit (4) that obtains, based on monitor outputs from these, a scattering parameter S.sub.11 corresponding to a reflectance property at the transmission antenna unit (A1) and a scattering parameter S.sub.21 corresponding to a transmission property from the transmission antenna unit (A1) to the reception antenna unit (A2), and outputs an alarm signal (Dout2) when at least one of the scattering parameter S.sub.11 and the scattering parameter S.sub.21 continuously exhibits a value outside its respective pre-set range over a predetermined period of time.
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