Design of mimo microstrip antenna system

This study presents five different configurations of microstrip antenna array with various innovative decoupling structures to reduce the mutual coupling between closely elements antenna system. The first design is comprised of two E-shaped antennas that are placed parallel and orthogonal to each other. The 2x3 matrix of C-Shaped Resonator (CSR) is proposed and placed between the antenna elements over the substrate, to reduce the mutual coupling and enhance the isolation between the antennas. The second design consists of a novel ladder-shaped conducting wall structure (LSCW) placed between two closely antennas. The proposed multiple-input multiple-output (MIMO) system is a dual band system operating at 4.45 GHz or 10.3 GHz frequencies depending on the dimensions of LSCW structure. The third design introduces defected ground structure (DGS) composed of spiral square slots etched from the extending ground plane. The fourth one is a dual-band systematic design of two planar MIMO monopole antennas predicated on the concept of metamaterials (MTMs). In this design, the MTM resonator is placed in the space between the antenna elements. The last one presents two-element microstrip array with three periodic T- Shaped DGS etched in the ground plane. The basic parameters of the MIMO array such as mutual coupling, surface current distribution, VSWR, ECC, DG, and the total efficiency have been simulated to verify the reliability and the validity of the MIMO systems. The results of simulation and measurements are presented, and the results are compatible with each other.