Isolation Enhancement Between MIMO Elements Using Slotted Ground And M-Shaped DGS

Abstract

MIMO antennas, due to their compact size, are widely used for wireless applications. The isolation or mutual coupling (MC) between MIMO elements is still a research problem. The spacing between the elements will be minimized to accomplish system compactness, which allows for high MC between the elements. This paper presents a new 2-element MIMO design with slotted patch elements using M-shaped DGS for the MC reduction. The feed used is strip-line feed, and the design is simulated using HFSSv15. With a slot cut in all the square patch's four directions, the MIMO design is simulated using HFSS. The ground plane design will alter the antenna parameters to the required level based on the parametric patch analysis. The structure comprises two elements on a 50×36 mm2 FR4 substrate. The effects of slots on gain and bandwidth are demonstrated. An M-shape DGS and a slot cut in all directions reduce this new design's MC. The proposed structure resonates at 3.5 GHz (WiMAX), 5.9 GHz (WLAN), 7.9 GHz (SATCOM applications at X-band), and 9.3 GHz (Radar, Cellular mobiles, and commercial WLAN) in the entire Ultra-Wide Band (UWB) range and therefore achieves multi-band characteristics. The spacing between elements is 11mm. A 20 dB MC reduction is achieved at the operating multi bands. The proposed design structure achieves ECC < 0.04 and DG > 9.985.