Finite element/mode-matching analysis of ferrite/dielectric line junctions of arbitrary cross-section

Abstract

This paper is focused on the analysis of line junctions obtained as a cascade of dielectric and ferrite guides of arbitrary cross-section. The main application of such structures is nonreciprocal devices such as isolators, circulators, or phase shifters. The efficient finite element/mode-matching approach is proposed to the analysis of such structures. In this approach, the finite element method is applied to determine propagation coefficients and field distributions in cross-sections of the structure. Then using mode-matching technique the scattering parameters of investigated junction are calculated. Since, all the field integrals required in mode-matching are evaluated in the pre-processing stage of finite element method, only small numerical effort is required to calculate scattering parameters of the junction. The numerical efficiency of proposed approach is examined for different geometries of longitudinally magnetized shielded ferrite coupled line junction. Obtained results are compared with the ones calculated using commercial software and presented in literature. A very good agreement is achieved.

Keywords:

• Ferrite
• nonreciprocal
• Faraday rotation
• finite element method
• mode-matching

Notes

No potential conflict of interest was reported by the author.

Additional information

Funding

This work was supported by the National Science Center [grant number DEC-2013/11/B/ST7/04309].