Radiation characteristics of an H-plane linear microstrip array antenna on a finite substrate

The effect of the finite grounded substrate size on the radiation characteristics of an H-plane linear microstrip array antenna on a high dielectric constant substrate is investigated. The radiation pattern characteristics of the array antenna versus scan angle are strongly influenced by the diffracted fields of surface waves from the substrate edge on the E-plane. The distance between the antenna center and the substrate edge on the E-plane for the enhancement of the radiation characteristics of the array antenna is presented.