'150W S-band gallium nitride solid state power amplifier (GaN SSPA) has been developed for satellite use. GaN devices have been already used for various fields in lower frequency bands (L-band and S-band) such as ground station amplifier and radar system. For space application, there is great interest in realizing high power solid state power amplifier using GaN devices to achieve higher output power compare with current GaAs devices.'
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