Patent ID: 8120420

Claim:
A demodulator, comprising: a splitting/matching section for carrying out a matching process of making the amplitude and phase of a first modulated signal match respectively the amplitude and phase of a second modulated signal; and a demodulation section for generating a demodulated signal on the basis of said first modulated signal and said second modulated signal, which have been subjected to said matching process carried out by said splitting/matching section, wherein said splitting/matching section has a splitting section for splitting a modulated signal, which has been obtained by modulating a carrier signal having a predetermined frequency on the basis of an original signal to be generated later by said demodulation section as said demodulated signal, into said first modulated signal and said second modulated signal, a first matching section for receiving said first modulated signal from said splitting section at a first input impedance determined by first predetermined circuit-element constants of said first matching section, and a second matching section for receiving said second modulated signal from said splitting section at a second input impedance determined by second predetermined circuit-element constants of said second matching section, said first circuit-element constants determining said first input impedance of said first matching section and said second circuit-element constants determining said second input impedance of said second matching section are set at values determined in advance in order to make said first input impedance equal to said second input impedance.