Minimised Four-Port MIMO Antenna for Sub-6 GHz and Satellite Applications

Abstract

The design and analysis of a four-port Multiple Input Multiple Output (MIMO) configuration antenna have been discussed in this work. Firstly, a single-element antenna has been designed using a monopole feedline, split ring resonators (SRR), and Defective Ground Structures (DGS). The SRRs were designed using rectangular and circular configurations and analysed their characteristics. The DGS is used to enhance the bandwidth of the proposed single-element antenna. Further four port MIMO configurations have been designed using four single-element antennas. To enhance the isolation, antennas are placed orthogonally to each other in MIMO configuration. The coupling between the monopole feedline and SRR plays a vital role in enhancing the impedance matching of the antenna configuration. The proposed MIMO antenna provides improved gain, high isolation, and compactness in size. The diversity performance matrices such as envelope correlation coefficient, diversity gain), Mean effective gain and total active reflection coefficient are <0.01, >9.95 dB, -1.0, and <-10 dB, respectively, which meets the performance criterion of the MIMO antenna. The designed four-port MIMO antennas can be used in sub-6 GHz (3.3 to 3.8 GHz) and fixed satellite television data services (10.7 to 14.5 GHz) applications.