| 摘要 |
PROBLEM TO BE SOLVED: To prevent interference of radio waves, and to miniaturize an apparatus. SOLUTION: The radio sensor apparatus 10 includes: first and second polarization antennas composed so that polarization surfaces of radiation waves mutually cross at right angles; a first mixer circuit 14a connected to the first polarization antenna and receiving a first reception signal received by the first polarization antenna; a second mixer circuit 14b connected to the second polarization antenna and receiving a second reception signal received by the second polarization antenna; a signal generation circuit 11 that feeds power to the first and second polarization antennas and generates a pulse signal supplied to the first and second mixer circuits 14a, 14b; and a differential amplification circuit 15 for differentially amplifying mixed output obtained by allowing the first mixer circuit 14a to mix the first reception signal and the pulse signal, and mixed output obtained by allowing the second mixer circuit 14b to mix the second reception signal with the pulse signal. COPYRIGHT: (C)2011,JPO&INPIT |
