Coupling-effects in finite arrays of open-ended waveguides with arbitrary cross-sections

A new approach is given to analyse the mutual coupling of open-ended waveguides with arbitrary cross-sections located in a conducting screen. The field inside each waveguide is expressed as a sum of the transverse electric (TE) and transverse magnetic (TM) modes, and expressions for the mutual admittances of modes excited at the aperture are obtained using a direct integration method. From these expressions the mode reflection and conversion coefficients are determined. Computed and measured results are presented for the mutual coupling between two waveguides for E- and H-plane dispositions