WIRELESS SENSOR DEVICE
First Claim
1. A wireless sensor device comprising:
- a transmission signal generation unit configured to generate a frequency-spread high frequency transmission signal such that a transmission frequency is continuously increased and decreased with a predetermined period;
a transmitter antenna configured to radiate the high frequency transmission signal generated by the transmission signal generation unit;
a receiver antenna configured to receive a reflected wave from an object having received the high frequency transmission signal radiated from the transmitter antenna, and output a frequency-spread high frequency reception signal;
a mixer circuit configured to receive a part of the high frequency transmission signal, which is input to the transmitter antenna, as a first frequency-spread high frequency signal, receive the high frequency reception signal, which is output from the receiver antenna, as a second frequency-spread high frequency signal, and output a DC beat signal by operating as a phase detector when a frequency of the first frequency-spread high frequency signal coincides with a frequency of the second frequency-spread high frequency signal; and
a DC component extraction circuit configured to extract the DC beat signal from an output signal of the mixer circuit.
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Accused Products
Abstract
A wireless sensor device includes a transmission signal generation unit that generates a frequency-spread high frequency transmission signal such that a transmission frequency is continuously increased and decreased with a predetermined period, a transmitter antenna that radiates the high frequency transmission signal, a receiver antenna that receives a reflected wave from an object having received the high frequency transmission signal, and outputs a frequency-spread high frequency reception signal, a mixer circuit that receives a part of the high frequency transmission signal as a first frequency-spread high frequency signal, receives the high frequency reception signal as a second frequency-spread high frequency signal, and outputs a DC beat signal by operating as a phase detector when frequencies of the first and second signals coincide with each other, and a DC component extraction circuit that extracts the DC beat signal from an output signal of the mixer circuit.
19 Citations
10 Claims
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1. A wireless sensor device comprising:
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a transmission signal generation unit configured to generate a frequency-spread high frequency transmission signal such that a transmission frequency is continuously increased and decreased with a predetermined period; a transmitter antenna configured to radiate the high frequency transmission signal generated by the transmission signal generation unit; a receiver antenna configured to receive a reflected wave from an object having received the high frequency transmission signal radiated from the transmitter antenna, and output a frequency-spread high frequency reception signal; a mixer circuit configured to receive a part of the high frequency transmission signal, which is input to the transmitter antenna, as a first frequency-spread high frequency signal, receive the high frequency reception signal, which is output from the receiver antenna, as a second frequency-spread high frequency signal, and output a DC beat signal by operating as a phase detector when a frequency of the first frequency-spread high frequency signal coincides with a frequency of the second frequency-spread high frequency signal; and a DC component extraction circuit configured to extract the DC beat signal from an output signal of the mixer circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification