Wireless sensor apparatus
View Patent ↗A wireless sensor apparatus includes first and second polarization antennas whose polarization surfaces of radiation waves are mutually orthogonal, a first mixer circuit connected to the first polarization antenna and configured to input a first reception signal received by the first polarization antenna, a second mixer circuit connected to the second polarization antenna and configured to input a second reception signal received by the second polarization antenna, a signal generation circuit configured to generate pulse signals fed to the first and second polarization antennas and also supplied to the first and second mixer circuits, and a differential amplification circuit configured to perform a differential amplification on a mixed output obtained by mixing the first reception signal and the pulse signal by the first mixer circuit and a mixed output obtained by mixing the second reception signal and the pulse signal by the second mixer circuit.
1. A wireless sensor apparatus comprising:
first and second polarization antennas whose polarization surfaces of radiation waves are mutually orthogonal;
a first mixer circuit connected to the first polarization antenna and configured to input a first reception signal received by the first polarization antenna;
a second mixer circuit connected to the second polarization antenna and configured to input a second reception signal received by the second polarization antenna;
a signal generation circuit configured to generate pulse signals fed to the first and second polarization antennas and also supplied to the first and second mixer circuits; and
a differential amplification circuit configured to perform a differential amplification on a mixed output obtained by mixing the first reception signal and the pulse signal by the first mixer circuit and a mixed output obtained by mixing the second reception signal and the pulse signal by the second mixer circuit.
2. The wireless sensor apparatus according to claim 1 ,
wherein the first polarization antenna is composed of a vertical polarization antenna, and the second polarization antenna is composed of a horizontal polarization antenna.
3. The wireless sensor apparatus according to claim 1 ,
wherein the first polarization antenna is composed of a right-handed circularly polarized wave antenna, the second polarization antenna is composed of a left-handed circularly polarized wave antenna.
4. The wireless sensor apparatus according to claim 1 ,
wherein the first polarization antenna and the second polarization antenna are integrated into one antenna apparatus.
5. The wireless sensor apparatus according to claim 1 ,
wherein the first and second polarization antennas commonly use a transmission antenna and a reception antenna.
6. The wireless sensor apparatus according to claim 1 ,
wherein the first and second polarization antennas are respectively separately provided with a transmission antenna for radiating wireless waves by being fed with the pulse signal and a reception antenna for receiving a reflected wave reflected from an object and outputting first or second reception signal.