Full-wave analysis of azimuthally magnetized ferrite-loaded circular structures using the one-dimensional finite difference frequency domain method

Abstract

Full-wave analysis of circular guiding structures completely filled with ferrite by using the finite difference frequency domain method is presented. The ferrite is assumed to be azimuthally magnetized to remanence. Emphasis is placed on the TE 0m modes that are rotationally symmetric. These modes exhibit nonreciprocal behavior that could be exploited to build phase shifters and microwave isolators. Dispersion diagrams for these modes are given for both forward and reverse waves, and the effect of various ferrite parameters is studied. It is shown that the dispersion diagram may exhibit a region of negative slope, which gives rise to backward wave. V V C 2008 Wiley Periodicals, Inc. Int J RF and Microwave CAE 00: 000-000, 2009.

Full-wave analysis of circular guiding structures using the finite difference frequency domain method

“…Very good agreement has been obtained in all the presented examples. Recently, we were able to extend this technique to analyze coaxial lines and circular waveguides completely filled with azimuthally magnetized ferrite medium [23].…”

Efficient characterization of EMC shielding in anisotropic high-Tc superconducting devices for industrial applications

“…Note that the homogeneous system (8) has been obtained via the application of Parseval's identity and the complementarity of boundary conditions of electrical fields and current on the metallized interface. The system is then solved for the propagation constant c by setting the determinant of (8) equal to zero and by evaluating the roots of the resulting characteristic equation.…”

“…In parallel, monolithic integrated circuits with anisotropic substrates offer attractive solutions in microwave resonators, filters, delay lines, antenna systems, and waveguide systems [4][5][6][7][8][9]. Severe insertion loss requirements in some telecommunication systems (such as TV satellite broadcasting, cellular communications, and various global navigation systems) make the use of high-temperature superconductors (HTS) an attractive alternative to most traditional technologies [10][11][12][13][14].…”

Numerical modeling of the area of phase shifter operation of the azimuthally magnetized circular ferrite waveguide

“…In particular, the configurations of azimuthal magnetization of the anisotropic load, under normal 01 TE mode excitation, may operate as nonreciprocal digital phase shifters [1,3,5-8,11-14, 16,17] and for this reason are attractive for the development of electronically scanned antenna arrays [18,19]. Different lines of attack have been suggested to examine their properties [1,3,[5][6][7][8][11][12][13][14]16,17]. Very successful proved to be recently the method, grounded on the boundary-value approach and harnessing confluent hypergeometric functions [6][7][8][12][13][14]16,17].…”

“…The circular transmission lines, containing transversely magnetized ferrite medium are employed in constructing various devices for the modern microwave equipment [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. In particular, the configurations of azimuthal magnetization of the anisotropic load, under normal 01 TE mode excitation, may operate as nonreciprocal digital phase shifters [1,3,5-8,11-14, 16,17] and for this reason are attractive for the development of electronically scanned antenna arrays [18,19].…”