DESIGN ANALYSIS OF NOVEL COUPLING STRUCTURES FOR MULTILAYER MMICS

Novel monolithic multilayered coupling structures are presented and th eir performances analyzed. These structures have reduced current crowd ing at their conductor edges compared to coplanar type coupling struct ures, and are particularly suitable for integration with multi-dielect ric MMIC's. This paper presents the closed-form analytical expressions for the coupler's even and odd mode impedances and coupling coefficie nts derived using conformal mapping techniques. These direct formulas have the advantage of being well suited for the computer aided design analysis of MMIC's without the need for lengthy numerical modelling te chniques.