Purpose In the research of the microwave pulse compression,it was found that a new physical model has a high power gain for the rectangular TE1,0,20 resonant mode at 2.920 GHz in S-band than the traditional physical m...Purpose In the research of the microwave pulse compression,it was found that a new physical model has a high power gain for the rectangular TE1,0,20 resonant mode at 2.920 GHz in S-band than the traditional physical model.In this report,the model structure,physical principle,simulation results,and theoretical analysis will be given in detail.Methods In the new physical model of microwave pulse compression system,(1)the technologies of the over-moded resonant cavity and over-sized output waveguide were used together first time for the rectangular TE1,0,20 resonant mode at 2.920 GHz in S-band,in order to improve the Q-value of the microwave resonant cavity and increase the power gain of the output pulse;(2)optimize the dimensions of the coupling window to get the maximum efficiency of the energy storage in the resonant cavity.Results From the latest research,it was shown that,in the optimal resonant state,(1)the power gain of the system can reach up to 276.97.Relative the traditional physical model,the power gain increased by 53.40%;(2)in the optimal resonant state,the energy storage efficiency of the over-moded system has also reached up to 88.91%.Relative to the traditional physical model,the efficiency increased by 23.33%;(3)another important result is that the power gain is very sensitive to the deviations of the resonant cavity length and output waveguide position from their optimal values.For example,the power gain will decrease by 61.45 or 67.17%,if the length deviation of the resonant cavity is−0.10 mm or+0.10 mm.It is very important to the theoretical and experimental studies.Conclusion It was shown that the new physical model of microwave pulse compression system has a higher power gain than the traditional physical model,by using the over-moded technology to the resonant cavity and output waveguide.Because of the universality of this high-gain over-moded physical model,the high-gain over-moded technology can be applied directly to X,Ku,and Ka bands.展开更多
基金Supported by National Natural Science Foundation of China(Grand No.:10475081).
文摘Purpose In the research of the microwave pulse compression,it was found that a new physical model has a high power gain for the rectangular TE1,0,20 resonant mode at 2.920 GHz in S-band than the traditional physical model.In this report,the model structure,physical principle,simulation results,and theoretical analysis will be given in detail.Methods In the new physical model of microwave pulse compression system,(1)the technologies of the over-moded resonant cavity and over-sized output waveguide were used together first time for the rectangular TE1,0,20 resonant mode at 2.920 GHz in S-band,in order to improve the Q-value of the microwave resonant cavity and increase the power gain of the output pulse;(2)optimize the dimensions of the coupling window to get the maximum efficiency of the energy storage in the resonant cavity.Results From the latest research,it was shown that,in the optimal resonant state,(1)the power gain of the system can reach up to 276.97.Relative the traditional physical model,the power gain increased by 53.40%;(2)in the optimal resonant state,the energy storage efficiency of the over-moded system has also reached up to 88.91%.Relative to the traditional physical model,the efficiency increased by 23.33%;(3)another important result is that the power gain is very sensitive to the deviations of the resonant cavity length and output waveguide position from their optimal values.For example,the power gain will decrease by 61.45 or 67.17%,if the length deviation of the resonant cavity is−0.10 mm or+0.10 mm.It is very important to the theoretical and experimental studies.Conclusion It was shown that the new physical model of microwave pulse compression system has a higher power gain than the traditional physical model,by using the over-moded technology to the resonant cavity and output waveguide.Because of the universality of this high-gain over-moded physical model,the high-gain over-moded technology can be applied directly to X,Ku,and Ka bands.
