Patent ID: 8358237

Claim:
A wireless sensor apparatus comprising: first and second antennas; a first mixer circuit which is connected to the first antenna and configured to input a first reception signal received by the first antenna; a second mixer circuit which is connected to the second antenna and configured to input a second reception signal received by the second antenna; a signal generation circuit for generating pulse signals to be fed to the first and second antennas and also supplied to the first and second mixer circuits; an integral differential amplification circuit for inputting a signal obtained by mixing the first reception signal with the pulse signal and output by the first mixer circuit and a signal obtained by mixing the second reception signal with the pulse signal and output by the second mixer circuit; and control means for controlling, in a case where wireless waves are radiated by feeding the pulse signals to the first and second antennas, an operation timing of the signal generation circuit and a path from the signal generation circuit to the first and second antennas in such a manner that after a prior pulse signal is fed to the first antenna and simultaneously supplied to the first mixer circuit, at a proximate timing which does not overlap with a pulse width of the prior pulse signal supplied to the first antenna and the first mixer circuit, a next pulse signal is fed to the second antenna and simultaneously supplied to the second mixer circuit.