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—Rigorous and fast convergent analysis of a coupler slotted in common,wall between two dissimilar rectangular waveguides is de- scribed by a mode-matching method combined with Fourier transform technique and consideration of the singularity of electromagnetic field around edges. Comparing with a conventional mode-matching method, the present method has two advantages. One is that it can avoid the usage of the dyadic Green’s function, the other is that it can over- come the relative convergence problem. The consideration of the field singularity has greatly improved the convergence and the calculated accuracy of a solution. This analysis is rigorous and the computer cost is very low.

RIGOROUS AND FAST CONVERGENT ANALYSIS OF A RECTANGULAR WAVEGUIDE COUPLER SLOTTED IN COMMON WALL