Analysis of planar slotted-waveguide array antennas with longitudinal slots using the method of moments

The method of moments is used to analyze planar slotted-waveguide arrays. Effects of various mutual couplings, thickness of the waveguide walls, and waveguide proximity are taken into account. This is achieved by formulating integral equations using the equivalence principle and then solving them using the method of moments. The required dyadic Green´s functions are introduced and the singularity of generalized admittance matrix integrals is removed. Finally, the results of this analysis are compared to measurements and other analyses.