The results of a power amplifier chip set for future radar systems are discussed. Excellent broadband frequency behaviour is shown. A driver amplifier with 50% band width and an output power of more than 1.3 Watt is discussed. A high power amplifier with 30% bandwidth, 5 Watt output power and a Power Added Efficiency of more than 30% is demonstrated. The driver amplifier results demonstrate the capabilities of the pseudomorphic HEMT technology for the development of broadband single chip power amplifiers for future radar systems.