Dielectric Superstrate Thickness Varying on the Characteristics of Square Patch Antenna

This paper focused on the coaxial probe fed square patch microstrip antenna characteristics have been studied with and without dielectric Superstrates. The dielectric constant of the substrate and Superstrate material is used same for designing of square microstrip patch antenna. The antenna designed frequency is 2.4GHz(ISM band) using transmission line model. In this paper experimentally investigated the effect dielectric Superstrates with and without on the characteristics such as bandwidth, beam-width, gain, resonant frequency, input impedance, return-loss and VSWR etc. Measured results shows when placing the Superstrates material thickness above the substrate the antenna parameter will be changed and antenna resonant frequency will be shifted lower side, while other parameters have slight variation in their values. In particular, the resonant frequency increases with the dielectric constant of the Superstrates thickness. In addition, it has also been observed that return loss and VSWR increases, however bandwidth and gain decreases with the dielectric constant of the Superstrates. Impedance characteristics are that both input impedance and the reactance which are increased as Superstrate become thick and its increases.