WIRELESS SENSOR DEVICE
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United States of America Patent
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N/A
app pub date -
Mar 26, 2015
filing date -
Sep 27, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The wireless sensor device includes an antenna that radiates a transmission signal and receives a reflected signal caused by the transmission signal reflected by a detection target, a transmission circuit that includes an output terminal connected to the antenna and generates the transmission signal, a detector circuit in which part of the transmission signal and the reflected signal are input thereinto and detected while the transmission signal is transmitted, a signal processing circuit that processes a signal output from the detector circuit, and a control circuit that controls the transmission circuit, wherein, between the antenna and the output terminal, transmission lines whose line lengths are different and switching means for switching between the transmission lines and connecting the antenna and the output terminal are provided, and differences in line length between the transmission lines are less than one-fourth of a wavelength of the transmission signal.
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