| The rapid development of economy and society is inseparable from the rapid exchange of information,and higher transmission rate and more reliable communication system will also be based on higher working frequency and higher output power of electronic equipment.Power amplifier is a device that can convert DC energy into AC energy.It is a key part of communication equipment.It must be improved constantly to meet the needs of economic and social development.At present,the output capacity of single power amplifier is still unable to meet these requirements.Therefore,it is of great significance to study the solid-state power synthesis technology with lower loss and wider working frequency band to realize the wideband high power amplifier.In this thesis,the design of Ku band power synthesis amplifier as the research purpose,combined with the status quo of research and development at home and abroad,discuss the current power synthesis amplification technology,on the basis of a reasonable design of power distribution synthesis network finally realized a 12?18GHz pulse power amplifier.The main achievements of this thesis are as follows:1.Design a high performance pulse modulation circuit to ensure that the power synthesis amplifier can work in pulse mode and can be switched to continuous wave mode by external control.Pulse power amplifier technology can realize the compression and controllable release of output energy.Power amplifier generally works in the condition of high voltage and large current,so it must ensure the safety and reliability of the bias voltage,and the modulation circuit is required to realize fast and stable switching.Finally,NMOS is used to conduct drain modulation on the amplifier,and the driver is used to drive NMOS.The circuit design of this part is completed.2.Based on the gap waveguide theory,a passive power distribution synthetic network is designed to meet the requirements of this thesis.By comparing the power distribution/synthesis techniques commonly used at present,the advantages and disadvantages of each are analyzed,and the design objectives and ideas of the power divider/power combiner required in this thesis are determined.Finally,based on the characteristics of slot gap waveguide and the related theory of slot waveguide,a new four-channel power distribution synthetic network working in the Ku band is designed and implemented.3.On the basis of studying the pulse modulation circuit and the power distribution synthesis network,the design of the power synthesis amplifier is completed by using the two-step cascade and four-way distribution synthesis method with a suitable amplifier chip.Finally,the parameters of the processing model are derived to complete the processing of the real object,and it is assembled and tested.The actual test results show that the average peak power of the amplifier in the whole Ku band is more than 100 W,the passive synthesis efficiency is more than 90%,the power additional efficiency is more than 25%,the pulse edge is less than 36 ns,and the whole system volume is 160mm*120mm*33mm. |
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