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Theoretical design and analysis of high-gain over-moded microwave pulse compression system

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Abstract

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 + 0.1 0 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.

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Acknowledgements

A special thanks to Prof. Luo Jirun, Prof. Zhang Zhaochuan, Prof. Zhang Rui, Dr. Fan Yu and Dr. Yang Xiudong for their deeply discussion to the physical phenomena and the theoretical analysis results to the new physical model.

Funding

Supported by National Natural Science Foundation of China (Grand No.: 10475081).

Author information

Authors and Affiliations

  1. Key Laboratory of High Power Microwave Source and Technology, CAS, Beijing, 100190, China

    Xiao-Yong Lei, Zhi-Qiang Zhang, Dong-Ping Gao, Wen-Xin Liu, Ding Zhao & Huai-Lin Gao

  2. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100190, China

    Xiao-Yong Lei, Zhi-Qiang Zhang, Dong-Ping Gao, Wen-Xin Liu, Ding Zhao & Huai-Lin Gao

  3. Graduate School, University of Chinese Academy of Sciences, Beijing, 100190, China

    Xiao-Yong Lei

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  1. Xiao-Yong Lei
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Correspondence to Zhi-Qiang Zhang, Dong-Ping Gao or Huai-Lin Gao.

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Lei, XY., Zhang, ZQ., Gao, DP. et al. Theoretical design and analysis of high-gain over-moded microwave pulse compression system. Radiat Detect Technol Methods (2024). https://doi.org/10.1007/s41605-023-00436-7

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  • DOI: https://doi.org/10.1007/s41605-023-00436-7

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