A Combination of Defected Ground Structure and Line Resonator for Mutual Coupling Reduction

In this paper, a new combination method of Defected Ground Structure (DGS) and Line Resonator to reduce mutual coupling in linear array $2\times 1$ antenna in H-plane structure is proposed. Both DGS and Line Resonator are designed to block surface waves of two antennas that work on a frequency of 2.6 GHz with an edge-to-edge distance element spacing is $0.049 \lambda\mathrm{o}$. The antenna performances before and after design implementation have been investigated. The simulation results show the coupling isolation between the antennas has been improved by −11.84 dB, the gain of the antenna increase by 0.191 dBi, and drop the side lobe level by 2.5 dB. The purposed design has the advantage of wide bandwidth, compactness and easy to fabricate, so it could be used for massive multiple-input multiple-output (M-MIMO) system for 5G communication in S-Band frequency.