Patent ID: 7292831

Claim:
A radio communication method for radio communications between a transmitter and a receiver, the transmitter obtaining an intermediate frequency (IF)-band modulated signal through modulation of input data, obtaining a radio-frequency-band modulated signal from a product between the IF-band modulated signal and a local oscillation signal, mixing the radio-frequency-band modulated signal and a portion of power of the local oscillation signal used for the frequency conversion, and transmitting a resultant mixture signal from a transmission antenna, the receiver comprising a detection circuit for detecting the mixture signal, transmitted from the transmitter and received by means of a reception antenna, so as to obtain an IF-band modulated signal, and an intermediate frequency (IF) signal demodulation section for demodulating reception data from the IF-band modulated signal, the method comprising: disposing a plurality of planar circuits in the receiver as constituent elements, each planar circuit, which serves as a single constituent element, including a planar printed reception antenna element and a planar reception circuit connected to the planar printed reception antenna element in a one-to-one relation, the planar reception circuit including an amplifier circuit and a square-law detector, wherein the plurality of planar circuits are arrayed; receiving the radio-frequency-band modulated signal transmitted from the transmitter, along with the local oscillation signal having a phase noise characteristic coherent with the radio-frequency-band modulated signal, and producing a product component of the two components to thereby restore an IF-band transmission source signal as a detection output; power-mixing detection outputs from the individual planar circuits; and feeding the mixed detection outputs to the IF signal demodulation section.