Patent ID: 7098859

Claim:
An antenna apparatus, comprising: a reflector antenna part which receives a linear polarization signal from a satellite at a time of reception and transmits a linear polarization signal to the satellite at a time of transmission; an orthomode transducer which divides the linear polarization signal received by the reflector antenna part into two-channel polarized signals orthogonal to each other at the time of reception, and combines two-channel polarized signals orthogonal to each other to convert them into the linear polarization signal at the time of transmission; a variable power divider which includes a first 90° phase combiner, a second 90° phase combiner, and a phase-amplitude adjustment block provided with variable phase shifters and variable attenuators respectively corresponding to the two-channel polarized signals, adjusts, at the time of reception, phases and amplitudes of the two-channel polarization signals divided by the orthomode transducer and orthogonal to each other and outputs them as a V polarization and an H polarization, and adjusts, at the time of transmission, phases and amplitudes of the inputted two-channel polarized signals of a V polarization and an H polarization and inputs the polarized signals orthogonal to each other to the orthomode transducer; an antenna control unit which sets phase amounts of the variable phase shifters provided in the phase-amplitude adjustment block and corresponding to the two-channel polarized signals and attenuation amounts of the variable attenuators to desired values; and a phase shifter and an attenuator which are provided on at least one of two-channel signal lines between the orthomode transducer and the first 90° phase combiner, and equalizes amplitudes and phases of the two-channel polarized signals.