Mutual coupling reduction in antenna arrays using the novel mushroom electromagnetic band gap and defected ground structure

Abstract

The multi‐input and multi‐output antennas have been developed to increase the communication capacity in many applications, but they also bring coupling problems between array elements, which will seriously affect their performance. Therefore, it is of great significance to reduce mutual coupling between array elements. In this article, a novel mushroom electromagnetic band gap (EBG) and defected ground structure (DGS) are introduced to reduce mutual coupling between array elements. Simulation results show that the EBG with metal vias placed between the array elements can improve the port isolation by 36 dB, and the introduced DGS can further suppress the coupling and achieve the decoupling effect of 47 dB. The measured results demonstrate the performance of the proposed structure for suppressing mutual coupling.

Single Layer Metamaterial Superstrate for Gain Enhancement of A Microstrip Antenna Array

“…Optimizing the configuration and arrangement of antenna elements within the array to achieve desired radiation patterns, beam steering capabilities, and side lobe suppression [9], utilizing multilayer stack configurations to add functionalities such as polarization diversity, frequency selectivity, and impedance matching [10,11]; mutual coupling often deteriorates an antenna array's radiation characteristics, to mitigate this, the element separation should be at least λ/2 (from center to center) to avoid mutual coupling and grating lobes [12], techniques to reduce mutual coupling include implementing electromagnetic band gap (EBG) structures [13], applying neutralization techniques [14], integrating stub transitions into the feeding microstrip line [15], etching slots or slits into the ground to create Defected Ground Structures (DGS) [16,17].…”