Broadband printed antennas for waveguide-based spatial power combiners

We present a spatial power combining architecture consisting of several interacting printed antenna arrays placed at dielectric interfaces in a multilayered waveguide. Narrowband resonant patch and slot antennas used in earlier designs are replaced by tapered meander line antennas and their modifications, in order to increase the frequency bandwidth and efficiency of the system and provide operation in multiple band regimes. The full-wave analysis of the interacting antenna modules presented here is based on the integral equation formulation for induced electric and magnetic surface current density discretized via the method of moments. Magnetic potential dyadic Green´s functions are obtained for a multilayered rectangular waveguide.