A Research On The Technology Of Microwave Power Synthesizer

With the high-speed development of microwave communication system,the research of high output power,high efficiency and wide-band microwave power combiner is also intensified.This paper focuses on the impedance matching network structure of microwave power synthesis and its core components.First,the power synthesizer assigns one way inputting microwave electromagnetic signal energy to two or more microwave power output at a certain power distribution ratio,and typically the usual power distribution ratio is equal.Then the power of this multi-channel microwave signal in each way is put through one power amplifier for power amplifying.Following this the,by the symmetrical use of the same power distribution circuit,the output power of each branch after the amplification of the microwave power are all guided into to a synthetic branch to output.At this moment by the overall output power of the inputting microwave signal is equivalent to a multi-channel amplifier cascade amplification.However,the most ingenious thing of this power combining is that the multi-channel amplification of the power amplification mode,which avoids the upper limitation requirement of each of the individual microwave power amplifier output power of.And the superimposed power through the passive transmission line could be guided out for emitting signal,which effectively solve the limited and low output power problem of the microwave communication.Then this paper introduces the form and characteristics of electromagnetic wave in radial transmission line,which provides a theoretical basis for analyzing and discussing radial waveguide power synthesizer.Based on this,the design theory and simulation process of the radial waveguide power divider are introduced systematically.The methods to reduce the loss of the synthesis circuit and improve the efficiency and bandwidth are also discussed.Then,a 5-way radial power divider operating at 2-6 GHz was fabricated.The input and output return losses are less than 16 dB and 10 dB,respectively,and the insertion loss is between 7.4 to 7.8 dB.Afterwards in the same way,we designed and produced another 12-channel power synthesizer working in 2-6GHz frequency range,the input and output return loss are less than 15 dB and 9dB,and the insertion loss is between 10.4dB-11.1dB.Then in the fourth chapter,based on the theory of designing and producing a microwave power synthesizer,a 4-way power synthesizer operating in the 2-6GHz band with an output power greater than 60 w microwave is produced and tested.The test results show that the power synthesizer achieves a saturation output power greater than 47.8dBm,at the frequency of 2.5GHz and 3.5GHz has the highest power output reached 49.3dBm.In the frequency range the gain is greater than 48 dB,gain flatness is within 3dB and the input standing wave ratio is less than 1.5.