Circularly polarized Ultra-wideband MIMO/Diversity antenna with triple band-rejection characteristic

Abstract This paper presents a Circularly polarized (CP) Ultra-Wideband (UWB) multiple-input-multiple-output (MIMO) antenna with three rejected bands. To produce triple band-notched characteristics, two compact Electromagnetic bandgap cells are placed near the feedline of the planar antenna. A broad Axial ratio bandwidth (ARBW) is obtained by adding a slot and a stub expanded from the ground plane. The ability to produce wide ARBW is an additional feature of the suggested structure. This MIMO antenna has a -10dB bandwidth of 3.1–10.6 GHz and axial ratio bandwidth of 3-10.4 GHz with three-rejected bands at 3.5, 5.5 and 8.2 GHz. Moreover, the suggested structure shows good diversity characteristics properties like an envelope correlation coefficient (ECC) > 0.03, total active reflection coefficient (TARC) > 10 dB, and diversity gain (DG) of approximately 9.99. The considered configuration is fabricated using an FR4 dielectric substrate with a total size of 42.7×55×1.6 mm3.