A high-isolation wideband mimo antenna with hybrid DGS–EBG decoupling for sub-6 GHZ 5G applications

Abstract

This study proposes a wideband four-port MIMO antenna for sub-6 GHz wireless communication systems. The antenna employs four elliptical-slotted radiating elements arranged orthogonally on a 0.762-mm-thick Rogers RO4350B substrate and a hybrid decoupling structure combining a T-shaped defected ground structure with a via-loaded electromagnetic bandgap structure. Six prototypes with overall dimensions of 118 × 118 × 0.762 mm³ were fabricated and measured to evaluate antenna performance and fabrication repeatability. The six prototypes exhibit a mean operating frequency range of 2.25 – 6.82 GHz and a mean minimum isolation of 26.9 dB. The antenna achieves a realized gain of 2.7 – 5.9 dBi, a total radiation efficiency exceeding 85%, and an envelope correlation coefficient below 0.002. These results demonstrate that the antenna is well suited for sub-6 GHz wireless communication applications.