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Digital transmit/receive modules (digital T/R modules) play a vital role in active phased array antennas for electronic warfare applications. High power amplifier (HPA) chain is the key component in the next generation of T/R modules for the future S band phased array antenna. Today GaAs MMIC HPA is widely used in most of T/R modules. However, the drawbacks of GaAs MMIC HPA such as low efficiency...
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