A full wave analysis of microstrip-to-waveguide transitions

Abstract

A wide band, low insertion loss transition from rectangular waveguide to shielded microstrip line is analyzed using a full wave mode-matching technique. The transition consists of a discontinuity between a ridge waveguide and the microstrip line and a ridge waveguide impedance transformer. The microstrip eigenmodes, including complex modes, are obtained by mode-matching method with LSE and LSM mode expansion. Computed results of a 17-22 GHz transition agree well with available experimental results. This rigorous approach provides a useful tool for the optimum design of microstrip to air filled waveguide or dielectric filled waveguide transitions.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>