Analysis of Linearly Tapered Slot Antennas on a dielectric substrate

A two level approach has been developed for the analysis of the Linearly Tapered Slot Antenna (LTSA) on a finite dielectric substrate. An approximate closed form Green´s function is obtained for the infinite dielectric structure. Galerkin type Method of Moments and RWG basis functions are used in order to solve Electric Field Integral Equations derived for the LTSA conductor and infinite dielectric parts. The feed section of the antenna is modeled as a voltage source with a small gap. In order to model the truncation effects of the dielectric region, equivalent volume polarization current density in the dielectric part is obtained. Obtaining the current distribution on the conducting plates and the polarization current density in the dielectric region separately reduces the number of unknowns, and improves the solution speed.