Electromagnetic modeling of an aperture-coupled patch array in the N-port layered waveguide for spatial power combining applications

An integral equation formulation is proposed for the analysis of waveguide-based aperture-coupled patch arrays for use in spatial power combining systems. A method of moments discretization is used to reduce a coupled set of integral equations to a matrix system resulting in the generalized scattering matrix (GSM) for the N-port waveguide transition. In addition, the GSM for a rectangular waveguide taper is obtained using a mode-matching technique. Receiving and transmitting waveguide modules are cascaded to obtain the GSM of the entire passive structure. The proposed electromagnetic algorithm has been incorporated in a modeling environment for the analysis of complete waveguide-based aperture-coupled patch amplifier arrays, including passive elements and active devices.