A reception frequency band is selected at 11.7 GHz 12.2 GHz, the local oscillating frequencies of local oscillators are determined at 10.75 GHz and 13.85 GHz, respectively, and each intermediate frequency band is selected at 950 MHz 1450 MHz and 1650 MHz 2150 MHz, respectively, so that the harmonic component of the frequency difference between local oscillation signals output from each local oscillator is not present in the frequency band of each intermediate frequency signal output from each mixer and in the reception band of polarization signals applied to input terminals.