HYBRID TECHNIQUES OF EBG, CSRR AND DGS FOR THE SUPPRESSION OF EMI IN MIMO ANTENNA

The purpose of this paper is to design a rectangular patch MIMO antenna with decoupling structures like Electromagnetic Band Gap Structure(EBG), Complementary Split Ring Resonators(CSRRs), and Defected Ground Structure(DGS) to operate over a 5G frequency band with a frequency range of 3.25GHz.An EBG structure consists of periodic metal patches that create a bandgap when the negative effective permeability is attained. So that the surface wave will be immensely suppressed which leads to the reduction of unwanted radiation in undesired direction. Thus, by creating a shielded environment , EBG structures also minimize the impact of Electro Magnetic Interference(EMI) on the antenna array. By incorporating CSRR structures, the resonance properties of the CSRRs can be utilized to attenuate or eliminate specific harmonic frequencies, resulting in reduced interference and improved antenna performance. The DGS structure works by introducing impedance variations in the ground plane and it is added to reinforce the decoupling effect between the antenna elements. These three structures work all together to achieve the desired transmission and reflection coefficient, and efficiency. Finally, the results are simulated and analyzed.