Abstract
This paper presents an extension of the formulation of wave propagation in transverse electric (TE) and transverse magnetic (TM) modes for the case of metallic cylindrical waveguides filled with longitudinally magnetized ferrite. The higher order modes were exploited. We externally controlled the cut-off frequency through the application of DC magnetic fields. The numerical results of dispersion diagrams for TE and TM modes were obtained and analyzed. We analyzed a waveguide antenna filled with partially magnetized ferrite using the mode matching (MM) technique based on the TE and TM modes. By using modal analysis, our approach considerably reduced the computation time compared to HFSS. Ferrites are important for various industrial applications, such as circulators, isolators, antennas and filters.
Highlights
Many researchers have been interested in guiding devices that use ferrite in some frequency range for their potential applications in microwave circuits
We present an extension of the transverse electric (TE) and transverse magnetic (TM) modes to cylindrical waveguides filled with lossless longitudinally magnetized ferrite (LMF) which takes account of the spatial distribution of the permeability of the medium that is applied to the transverse fields
We show how the dispersion diagrams were obtained and we discuss the effects of anisotropic parameters on dispersion characteristics and cutoff frequencies
Summary
Many researchers have been interested in guiding devices that use ferrite in some frequency range for their potential applications in microwave circuits. We present an extension of the transverse electric (TE) and transverse magnetic (TM) modes to cylindrical waveguides filled with lossless longitudinally magnetized ferrite (LMF) which takes account of the spatial distribution of the permeability of the medium that is applied to the transverse fields. Our simulations of a cylindrical metallic waveguide antenna filled with partially magnetized ferrite using mode matching (MM) [16,17] were in good agreement with those obtained with HFSS. Our antenna was tuned to the desired operating frequency for the ferrite magnetization circuit by adjusting the voltage applied externally, which in turn affected the variation of the static magnetic field applied to the ferrite. Our interest in this study was in the tuning of the operating frequency of the antenna This formulation is a useful tool for microwave engineers. This type of material is extensively applied by information technology industries, in microwaves and RF devices, such as patch antennas, waveguide antennas, resonators, circulators, insulators, phase converters and filters
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