Patent ID: 7315728

Claim:
A polarized wave measuring apparatus comprising: a first antenna and a second antenna whose planes of reception polarization are orthogonal to each other; band restricting means for attenuating any component other than a desired frequency component from a first received signal received from said first antenna and a second received signal received from said second antenna; first mixing means for mixing said first received signal and said second received signal to generate a first mixed signal; second mixing means for mixing said first received signal and the second received signal, which is phase-shifted by one-quarter wavelength to generate a second mixed signal; low pass filtering means for eliminating high-frequency areas other than a baseband area from said first mixed signal and said second mixed signal; phase difference calculating means for calculating a phase difference between said first received signal and second received signal from the first mixed signal and the second mixed signal stripped of these high-frequency areas; field intensity measuring means for measuring the field intensities of said first received signal and said second received signal with components other than the desired frequency component attenuated; and polarization calculating means for calculating polarization of the received signal from the field intensities of said first received signal and second received signal and said phase difference.