Study On Microwave Pulse Compression Of Helical Ripple Waveguide

With the increasing application of microwaves,the power requirements for microwave devices are getting higher and higher.However,if the output power is increased by ordinary methods,the complexity of the devices will increase,and the technical difficulties will be greater.Because of miniaturization,it is necessary to choose a more feasible solution to achieve high-power microwave output.Scientists have found through research that high-power microwaves can be output by pulse compression.Various methods of pulse compression in recent years have been the focus of research.Among them,for the study of pulse compression,G.Denisov of Russia mentioned the effect of pulse comp ression by changing the dispersion characteristics of a waveguide through a spiral corrugated waveguide.And because spiral corrugated waveguide has the characteristics of simple structure and technically easy to implement,it has great significance for the study of pulse compression.At the same time,the input ripple power required by the spiral corrugated waveguide is lower.It belongs to passive pulse compression.The different propagation speeds of the wave in the spiral corrugated waveguide make the waves entering from the input port at different times reach the output port at the same time,achieving the effect of pulse compression.Firstly,this paper has a certain understanding of the characteristics of various kinds of pulse compression.Selecting helical ripple waveguide pulse compression as the research focus.The dispersion characteristics of the spiral corrugated waveguide were deduced by the coupled mode theory,and the propagation speed relationship of different frequency waves in the spiral corrugated waveguide was simulated by the MAGIC software,and the input pulse was conveniently selected to select the appropriate frequency and frequency bandwidth.Second,the structure of each part of the spiral wave waveguide pulse compression system is modeled,and the appropriate pulse signal is also simulated.The pulse compression parameters obtained after the preliminary simulation calculation are the input pulse width is 70 ns,the corresponding output pulse half width is 2.8ns,and the power gain is 5.096.For the structure obtained by the preliminary simulation,there are still more places to be optimized,such as the length of the spiral corrugated waveguide regular section,the period and amplitude of the spiral ripple,the pulse width and frequency bandwidth of the input pulse,the period of the spiral ripple waveguide transition section,the length of the elliptical section of the spiral ripple waveguide,and the accuracy of the MAGIC software itself.Finally,by analyzing the causes of various effects of pulse compression,the spiral ripple waveguide pulse compression system parameters are optimized.The simulation results show that the input pulse is 70 ns,the half width of the output pulse is 2.2ns,and the corresponding power gain is 6.03.At the same time,by reducing the pulse width to 35 ns,the length of the entire pulse compression system is reduced,and the corresponding output pulse parameters are simulated.