An Analytical Design and Analysis Method for a High-Power Circular to Rectangular Waveguide Mode Converter and Its Applications

• Published in: IEEE transactions on microwave theory and techniques Vol. 57; no. 6; pp. 1516 - 1525
• Main Authors: Yeddulla, M., Tantawi, S., Jiquan Guo, Dolgashev, V.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.06.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Accelerator RF systems; Applied sciences; Circuit properties; Computer simulation; Converters; coupled mode analysis; Design engineering; Design methodology; Electric, optical and optoelectronic circuits; electrodynamics; electromagnetic analysis; electromagnetic fields; Electromagnetic scattering; Electromagnetic waveguides; Electronics; Exact sciences and technology; high-power RF; Linear accelerators; Mathematical analysis; Mathematical models; Microwave and submillimeter wave devices, electron transfer devices; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; Microwave devices; microwave power transmission; Nonuniform; Perturbation methods; Radio frequency; Rectangular waveguides; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Solvers; Transducers; Waveguide transitions; waveguides; Performance evaluation; Electric transformer; Microwave device; Numerical method; Accelerator RF systems; Coupled mode theory; TE mode; Perturbation method; Accuracy; Energy characteristic; electromagnetic analysis; Converter; Circular waveguide; Mode conversion; high-power RF; Electrodynamics; waveguides; RF systems; Waveguide; microwave power transmission; High power; microwave devices; Simulation; electromagnetic fields; Analytical method; coupled mode analysis; High frequency; Simulator; Rectangular waveguide
• ISSN: 0018-9480; 1557-9670
• DOI: 10.1109/TMTT.2009.2020781

An analytical method to estimate the scattering of RF power into multiple modes inside a nonuniform waveguide using perturbation techniques is presented. This method is quite general, much faster than numerical methods, and may be applied to a wide variety of nonuniform waveguides. We have used this method to design and analyze a three-section mode transformer that converts a TE 01 circular waveguide mode to a TE 20 rectangular waveguide mode. This mode converter is specially suitable for use in ultra-high-power applications. Due to the complexity of the problem, we have used the symbolic solver Mathematica to produce most of our analytical results. The results match within reasonable accuracy with High Frequency Structure Simulator field solver simulations. We also present the application of this mode converter to variety of ultra-high-power microwave components and experimentally show the performance of these devices.