Center antenna elements (small circles) of the SARs use a phase conjugation circuit (PCC) for retrodirective control, while the other six elements (dots) use only phase shifters. The PCC gives an output of the conjugated phase of the received pilot signal. Each antenna element is a micro-strip antenna connected to the high power amplifier through a digital phase shifter. The HPA consists of seven transmission amplifiers, each with an output of 12 W at maximum.
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