X-band power amplifier for active phased-array antennas

An amplifier is designed with P/sub 1/ /sub dB/>2 W and gain >30 dB in the frequency band of 8.1/spl plusmn/0.25 GHz. The gain variation is less than 1 dB, with controlled phase from 0/spl deg/ to 360/spl deg/, and efficiency of more than 20%. As an active element base we use crystals of the transistors A/spl Pi/608 and A/spl Pi/603, produced by the Pulsar plant.