Deduction in Mutual Coupling Across Two Microstrip Patch Antenna Elements using a Compact DGS Structure through CST Antenna Simulator

Abstract

If two or more antennas are present in an antenna array, the mutual coupling between them becomes a major issue to deal with.
At microwave frequency, microstrip is often used as transmission line because of its very good performance in transferring energy
and microwave signals. The most commonly used microstrip patch antenna has similar structure as microstrip line. On one side
of the thin dielectric substrate layer, is an extremely thin layer of the conductor, which forms the radiating elements, and on the
downwards side is the ground plane, which is also made of metallic material. Our motive is to maintain the mutual coupling
suppressing structure to the simplest form. We thus use a Defected Ground Structure (DGS), which greatly reduces the mutual
coupling between the antenna elements, thereby enhancing the performance of antenna array. The introduction of DGS in the
system is not affecting the characteristics of antenna array. The Simulation is done using CST (Computer Simulation Technology)
antenna simulation software. The recent boom in wireless communication industry, especially in the field of cellular telephony
and wireless data communication, has lead to the demand for multiband antennas.