Design of multiband miniaturized MIMO antenna with defected ground for future mobile communications

Abstract

A multiband four port 4 element slotted 2x2 MIMO antenna for future mobile communication is presented in this paper. The proposed antenna consists of a modified square slot at the center of the patch and eighteen rectangular slots around the borders of the patch in the form of a modified Sierpinski carpet fractal structure. Miniaturization and multiband characteristics have been obtained with the help of a novel modified fractal structure. Then two such antennas have been combined to form a 2x1 MIMO antenna. Further 2x2 MIMO antenna has been designed with 4 elements. The proposed 2x2 MIMO antenna consists of four novel modified Sierpinski carpet-shaped antenna elements. Four antenna elements have been closely separated with ⅄/2. Novel defected ground structures with ellipses have been made to achieve high isolation within 4-elements of the MIMO antenna. The designed antenna has been simulated for different combinations of Active sources and phase shifts. The designed antenna has been fabricated, and the results have been measured. The diversity parameter such as ECC < 0.001, ensures that the proposed design is suitable for the MIMO applications. The novel design structure enhanced multiband characteristics and improved miniaturization represent that the proposed antenna will be an efficient candidate for future wireless communication systems including IoT and Biomedical applications.