Characterization of a class of waveguide discontinuities using a modified TE/sub mn//sup x/ mode approach

摘要

A modified TE/sub mn//sup x/ wave approach which is used in conjunction with the mode matching method for the field-theory modeling of a class of waveguide discontinuities is presented. In particular, for characterizing waveguide discontinuities in which resonant effects occur, this method resolves conflicting results which have been observed using the conventional TE/sub mn//sup x/ mode matching technique and the generalized analysis based on a linear superposition of TE/sub mn//sup z/ and TM/sub mn//sup x/ modes. It is found that results from the modified TE/sub mn//sup x/ mode approach are consistent with the generalized analysis and agree well with measurements on iris filters and corrugated waveguide polarizers. In comparison with the generalized TE-TM mode analysis, the modified TE/sub mn//sup x/ mode procedure consumes less memory and CPU time and provides improved convergence behavior without sacrificing design accuracy.