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Multi-mode coupling wave theory for helically corrugated waveguide

Zhang, Liang and He, Wenlong and Ronald, Kevin and Phelps, Alan D. R. and Whyte, Colin G. and Robertson, Craig W. and Young, Alan R. and Donaldson, Craig R. and Cross, Adrian W. (2012) Multi-mode coupling wave theory for helically corrugated waveguide. IEEE Transactions on Microwave Theory and Techniques, 60 (1). pp. 1-7. ISSN 0018-9480

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Helically corrugated waveguide has been used in various applications such as gyro-backward wave oscillators, gyro-traveling wave amplifier and microwave pulse compressor. A fast prediction of the dispersion characteristic of the operating eigenwave is very important when designing a helically corrugated waveguide. In this paper, multi-mode coupling wave equations were developed based on the perturbation method. This method was then used to analyze a five-fold helically corrugated waveguide used for X-band microwave compression. The calculated result from this analysis was found to be in excellent agreement with the results from numerical simulation using CST Microwave Studio and vector network analyzer measurements.