| 摘要 |
In a variable power divider including a first 90° phase combiner ( 30 ), a second 90° phase combiner ( 40 ), and a phase-amplitude adjustment block ( 50 ), the phase-amplitude adjustment block ( 50 ) includes, correspondingly to two-channel polarized signals, variable phase shifters ( 51, 52 ) for adjusting their phase amounts and variable attenuators ( 55, 56 ) for adjusting amplitudes (attenuation amounts), and the phase amounts and the amplitudes of the two-channel polarized signals can be adjusted by an antenna control unit ( 60 ). Further, there are included a phase shifter ( 53 ) and an attenuator ( 57 ) provided on two-channel signal lines between an orthomode transducer ( 20 ) and a first 90° phase combiner ( 30 ) and for equalizing the amplitudes and phases of the two-channel polarized signals. By this, an antenna apparatus can be inexpensively provided which uses a reflector antenna ( 10 ) to perform transmission/reception of a signal to/from a satellite at high accuracy, and is miniaturized to be suitable for mounting on an aircraft or the like.
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