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Demonstration of a High-Order Mode Input Coupler for a 220-GHz Confocal Gyrotron Traveling Wave Tube

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Abstract

A design of high-order mode input coupler for 220-GHz confocal gyrotron travelling wave tube is proposed, simulated, and demonstrated by experimental tests. This input coupler is designed to excite confocal TE 06 mode from rectangle waveguide TE 10 mode over a broadband frequency range. Simulation results predict that the optimized conversion loss is about 2.72 dB with a mode purity excess of 99%. Considering of the gyrotron interaction theory, an effective bandwidth of 5 GHz is obtained, in which the beam-wave coupling efficiency is higher than half of maximum. The field pattern under low power demonstrates that TE 06 mode is successfully excited in confocal waveguide at 220 GHz. Cold test results from the vector network analyzer perform good agreements with simulation results. Both simulation and experimental results illustrate that the reflection at input port S11 is sensitive to the perpendicular separation of two mirrors. It provides an engineering possibility for estimating the assembly precision.

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Acknowledgments

The authors gratefully acknowledge the assistance of Yin Huang, and Weirong Deng on engineering design.

Funding

This work is supported by the National Natural Science Foundation of China under Grant 61401064, 61771096.

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Authors and Affiliations

  1. Terahertz Research Center, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, China

    Xiaotong Guan, Wenjie Fu & Yang Yan

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  1. Xiaotong Guan
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  2. Wenjie Fu
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  3. Yang Yan
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Correspondence to Xiaotong Guan.

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Guan, X., Fu, W. & Yan, Y. Demonstration of a High-Order Mode Input Coupler for a 220-GHz Confocal Gyrotron Traveling Wave Tube. J Infrared Milli Terahz Waves 39, 183–194 (2018). https://doi.org/10.1007/s10762-017-0458-y

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  • DOI: https://doi.org/10.1007/s10762-017-0458-y

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