Research Of Cyclotron Wave Protector At 5.54GHz

With the continuous development of radar system,the diversification of radar system makes the countries’ requirements for radar receiver protection technology become higher and higher.In addition to the current mainstream receiver protection technology based on passive gas TR discharge tube,there is a special electric vacuum device based on cyclotron resonance mechanism,which is widely used in various types of radar systems as a front-stage protection device by virtue of its own excellent self-protection,very short recovery time and response time,and large power capacity,etc.It is cyclotron wave protector.As a non-traditional microwave device,the cyclotron wave protector is mainly composed of four parts: input and output Cuccia resonant cavities,electron gun,permanent magnet system,and buck collector.Its use of transverse modulation of the electron beam,so that the charge distribution of the electron beam after modulation remains uniform,the electrons in motion are in the same state,all electrons will accelerate or decelerate at the same time,greatly reducing the dispersion of electron velocity.The electron beam can exchange energy better when interacting with microwave field,so this kind of device has higher energy conversion efficiency.In this thesis,the high-frequency structure and electro-optical system of a cyclotron wave protector operating at 5.54 GHz are investigated.Firstly,the working mechanism of the cyclotron protector is described,and the basic theoretical analysis of the highfrequency resonant cavity is carried out.The simulation results show that the highfrequency structure of the cyclotron protector meets the design index under normal input power and high output power,and achieves a high-frequency system with high energy conversion efficiency.Then,based on the required electrical parameters of the highfrequency structure,the electron gun structure that meets the normal operation of the cyclotron protector is designed by using CST simulation software,and the axial static magnetic field required for the high-frequency interaction zone is generated by the permanent magnet ring combining axial magnetization and radial magnetization.Finally,the whole tube design of the 5.54 GHz cyclotron wave protector is completed.When the input power is 10 k W,the efficiency of injection wave interaction is 86.5%,and the efficiency of the collecting pole is 85.6%;when the input power is 100 k W,the output power is only 50 W and the efficiency of protection is 99.95%,proving its good selfprotection.In addition,in order to verify the transmission characteristics of the high frequency structure of the cyclotron wave protector,it was processed and an experimental study was carried out.The experimental results show that the designed high frequency structure operates at 5.58 GHz,the S11 parameter at the resonance point is-3.7 dB,the isolation is70 dB,the isolation is good and the transmission characteristics are basically in line with the design model.