Modeling of substrate integrated waveguide series fed dielectric resonator antenna array with longitudinal slots excitation

A circuit model is presented for the modeling of mutual coupling for substrate integrated waveguide (SIW)-series fed dielectric resonator antenna (DRA) array excited by longitudinal slots. The antenna element can be modeled using S-parameters or π equivalent circuit. The mutual coupling between antennas is modeled as a two-port network shunt connected between adjacent antennas. A four elements millimeter-wave SIW-DRA array fed by longitudinal slots is simulated to validate this model. The simulation results using the developed model agree well with the full-wave solver results.