Multi-Mode Coupling Wave Theory for Helically Corrugated Waveguide

• Published in: IEEE transactions on microwave theory and techniques Vol. 60; no. 1; pp. 1 - 7
• Main Authors: Liang Zhang, Wenlong He, Ronald, K., Phelps, A. D. R., Whyte, C. G., Robertson, C. W., Young, A. R., Donaldson, C. R., Cross, A. W.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-01-2012; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Amplifiers; Applied sciences; Circuit properties; Corrugated waveguides; Coupling coefficients; coupling wave theory (CWT); Couplings; Dispersion; dispersion curve; Dispersions; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Equations; Exact sciences and technology; helically corrugated waveguide; Joining; Mathematical analysis; Mathematical model; Mathematical models; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; Microwave theory and techniques; Microwaves; Oscillators; Oscillators, resonators, synthetizers; Waveguide theory; X-band; Network analyzer; Wave equation; Backward wave oscillators; Mode coupling; Travelling wave amplifier; X band; Dispersion relation; Microwave; Centimetric wave; Electromagnetic pulse; Vector method; dispersion curve; helically corrugated waveguide; Coupling coefficients; coupling wave theory (CWT); Perturbation method; Coupling coefficient; Numerical simulation; Corrugated waveguide
• ISSN: 0018-9480; 1557-9670
• DOI: 10.1109/TMTT.2011.2170848

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.