Full-wave analysis of dielectric-loaded waveguide slot antennas including internal and external mutual coupling

Abstract

A hybrid full-wave technique is proposed to analyze the structure having two slots cut in the wall of a rectangular waveguide partially filled with a dielectric slab. Each slot element is decomposed into two parts: a dielectric-loaded waveguide T-junction and an open-ended waveguide. A four-port network is composed in the T-junction cascading and the internal mutual coupling between the two slots is included automatically. The external mutual coupling is calculated by a full-wave integration method. Combining the scattering parameters of the four-port network and the external mutual coupling solves the whole waveguide slot structure. Numerical results obtained by our hybrid method are presented and compared with simulated data by Ansoft's HFSS. Good agreement is observed for all the cases considered.