Document Type
Article
Publication Date
Winter 12-10-2025
Abstract
Abstract: This paper investigates the cut-off frequency of a perfectly conducting circular waveguide coated with an externally magnetized ferrite shell. Wave equations in both the ferrite shell and the core inside the cylinder are solved resulting in a Fourier series expansions involving Bessel and trigonometric functions with unknown coefficients. The influence of the magnetization current on the permeability tensor is considered in the analysis. By applying boundary conditions, four characteristic equations are derived, and their vanishing determinants define the cut-off frequencies of the structure. A MATLAB program is developed to numerically solve the derived equations. Results are presented for various levels of DC magnetization, demonstrating the tuneable nature of the waveguide. The structure shows potential for use in frequency-reconfigurable circular horn antennas.
Recommended Citation
Hossam, M., Ragheb, H. A., & El-Damak, A. R. (2026). The analysis and design of a circular waveguide coated with a magnetized ferrite layer. Journal of Electromagnetic Waves and Applications, 40(4), 566–584. https://doi.org/10.1080/09205071.2025.2596096