Theoretical analysis and design optimization of wideband input/output branch waveguide couplers for a sheet beam traveling wave tube

G.X. Shu, J.X. Wang, G. Liu, Y. Zheng, L.Y. Yang and Y. Luo

Journal of Electromagnetic Waves and Applications, 2015, vol. 29, issue 15, 2002-2013

Abstract: The branch waveguide coupler (BWC) with an intrinsically excellent microwave property in an extremely wide frequency range was proposed to build the input/output (I/O) structure for the sheet beam traveling wave tube. The odd and even mode theory is utilized to analyze the BWC. Based on the theory, a code is written to calculate its microwave performance parameters. The numerical calculation has a good agreement with the computation simulation. To improve the efficiency of developing the BWC, a novel design optimization approach based on the MATLAB optimization tool is proposed. A BWC with nine branch waveguides is optimized using multi-objective genetic algorithm. In addition to the excellent microwave property, a compact configuration is achieved. It is predicted that the I/O structure possesses a very good performance with coupling above −0.3 dB, port reflectivity under −19 dB, and isolation less than −15 dB in a broad frequency range of 37.4–51.0 GHz, corresponding to a bandwidth of 13.6 GHz (30.7%).

Date: 2015
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DOI: 10.1080/09205071.2015.1073123

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