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Broadband Nonuniform Terahertz Multimode Conversion Series with Compactness and Pure Pattern

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Abstract

In our 0.22 THz gyrotron system, the overmoded conversion sequence is the critical component to convert the TE03 output mode of the gyrotron oscillator to the TE10 input mode of the gyrotron traveling wave amplifier (gyro-TWA). However, with the increase of the gyrotron’s operating frequency and output power, the output waveguide generally adopts highly overmoded structures, increasing the longitudinal size and narrowing the bandwidth of the traditional mode converter with uniform period and radial perturbation. Due to a much more significant coupling strength factor, a faster power increment in target modes TE02 and TE01 causes the axial length to decrease significantly in the proposed converters with nonuniform double perturbations. In our numerical and simulation results, compared to the traditional uniform-ripple-wall converters, the proposed nonuniform circular TE03-TE02-TE01 converter shortens 44.18% of the total length and increases the bandwidth over 95% conversion efficiency by 150%. Meanwhile, we employed a sidewall converter other than the inline converter to complete the CWG TE01-RWG TE10 conversion for its high efficiency and compactness. Based on the operation principle of the monostatic radar imaging system, the mode pattern measurement corroborates the desired electric field distributions near the waveguide port. The experimental results indicate the proposed mode conversion sequence has advantages of high conversion efficiency over 80%, low loss, and compact structure.

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Authors and Affiliations

  1. Terahertz Research Centre, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China

    Feng Lan, Guiju He, Yang Yan, Lin Meng, Ziqiang Yang, Yaxin Zhang, Zongjun Shi, Tianyang Song & Luyang Wang

  2. The Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313001, People’s Republic of China

    Feng Lan, Ziqiang Yang & Yaxin Zhang

  3. Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI, 48109-2121, USA

    Pinaki Mazumder

  4. Institute of Electronics, Chinese Academy of Sciences, Beijing, 100089, China

    Wenxin Liu

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  1. Feng Lan
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  2. Guiju He
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  4. Yang Yan
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Correspondence to Feng Lan.

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Lan, F., He, G., Mazumder, P. et al. Broadband Nonuniform Terahertz Multimode Conversion Series with Compactness and Pure Pattern. J Infrared Milli Terahz Waves 43, 150–164 (2022). https://doi.org/10.1007/s10762-022-00840-y

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