Ku-band Power Amplifier Synthesis Research

Firstly, application theory,research,design and testing of Ku-band microwave solid-state high power amplifier system have been presented in this paper. Secondly, theory analyzing, emulation testing, fabrication and experimentation of a broadband 10-way power divider/combiner that employed a coaxial probe array radial waveguide and several rectangular waveguides, also have been described in this paper.Microwave solid-state power amplifier system, as the key portion of all solid-state radar transmitter, determines the performance of radar transmitter. In the recent years, microwave solid-state power device has a great development, the operating principle of bipolar microwave power transistors, metallic oxide semiconductor field effect microwave power transistors and GaAs field effect microwave power transistors, also design principle of biasing circuit of microwave power amplifier, application of power FET and cooling design of circuit also have been discussed in the chapter 2. At last in the chapter 4, under the independent experimental verification of three different (power output from low to high) power amplifier, a three-stage Ku-band power amplifier system had been rearched and developed.Because of demanding of high power output of radar transmitter, independent power amplifier system can't supply enough output power for radar transmitter. So it needs to be divided, amplified and combined in order to obtain high output power. A novel 10-way power divider/combiner that employed racial waveguide and rectangular waveguide are introduced in the chapter 3, the topology, the transition of different electromagnetic field modes and equivalent circuit of this 10-way power divider/combiner was described. At last in chapter 5, under the results of emulation testing of the 10-way power divider, the fabrication and experimentation of power divider was accomplished. Testing results: the measured 15-dB return loss bandwidth of the power divider is found to be 1.5 GHz (15~16.5GHz), and insertion loss is less than 1.5dB in this bandwidth.