Equivalent Circuit of a Narrow-Wall Waveguide Slot Coupler

An expression for the equivalent network of a long axial slot in the common narrow wall between two rectangular waveguides is detemined from self-reaction and discontinuity in modal current. The analysis is extended to the case of H-plane Tee junction coupled through a Iongitudinal slot in the narrow wall of primary guide. Variation of coupling, input VSWR, and impedance loading on the primary guide are determined from the equivalent network parameter. A comparison between theoretical and experimental results is presented.