Satellite broadcasting receiving tuner which inhibits interference caused by satellite broadcast signals having one octave higher frequency band

摘要

A disturbance may be prevented from being caused in a satellite broadcasting signal of a reception target by a satellite broadcasting signal in which a frequency is higher by 1 octave. This satellite broadcasting receiving tuner includes first and second tuners to which satellite broadcasting signals of a plurality of channels arranged within a frequency band higher than 1 octave are inputted, a local oscillator which oscillates at the same frequency as the frequency of a desired reception satellite broadcasting signal and a higher harmonic wave attenuating device for passing a fundamental wave of a local oscillation signal from the local oscillator and which attenuated a higher harmonic wave, wherein the local oscillation signal is inputted through the higher harmonic wave attenuating device to the first and second demodulators, a phase of the local oscillation signal inputted to the first demodulator and a phase of the local oscillation signal inputted to the second demodulator are shifted from each other by 90 degrees, and baseband signals are respectively outputted from the first and second demodulators.