Patent ID: 8380140

Claim:
A microwave/millimeter wave communication apparatus, comprising: a radiation type oscillator formed by integrating a three-electrode high-frequency amplifying device to generate negative resistance at a resonating cavity, and share a function to emit an electromagnetic wave to space; wherein during transmission, an oscillation frequency of the radiation type oscillator is varied in accordance with a baseband signal amplitude to frequency modulate a radiation wave as a transmit RF signal, and during reception, demodulation operation is performed by the oscillation of the radiation type oscillator being injection-locked on a receive RF signal arriving from outside that is frequency modulated in accordance with baseband signal amplitude, generating a change in oscillation frequency of the radiation type oscillator that is a same as a frequency change of the receive RF signal, and obtaining a baseband signal amplitude from a change in bias of the three-electrode high-frequency amplifying device due to the oscillation frequency change.