Coupling Between Waveguide-Fed Planar Slot Arrays

Coupling between two waveguide-fed planar slot arrays is investigated using full-wave analysis. The analysis employs the method-of-moments solution to the pertinent coupled integral equations for the aperture electric field of all slots. From the TE₁₀ mode scattered by the slots, the complex coefficient of the wave incident at the input port of each array is computed. By exciting the input port of one of the arrays and match-terminating the other, we determine the incident wave amplitude at the input port of the second array, thereby determining the coupling. Computed coupling values are presented for different array geometries.