Design of Hexagonal Wideband Microstrip Patch Antenna for MIMO Wireless Applications

In this work, a four-port MIMO structure has been proposed to achieve improved isolation and operate in the ultra/super-wideband (UWB) frequency range. The projected designs comprise hexagonal rings embedded with UWB hexagonal units with a partial ground plane defect. The alteration of the hexagonal patch and ground planes modifies the current flow and yields in realizing a wider fractional bandwidth. The triple-band notches are created on conventional hexagonal geometry using rings. The proposed unit cell is centrosymmetric geometry and it resonates from 2.62 − 20.64 GHz with fractional bandwidth of 155%. The proposed four-port MIMO configuration has physical dimensions of 0.86λ × 0.86λ × 0.017λ and it resonates from 2.70 − 20.70 GHz with fractional bandwidth of 153.85%. The distinctive feature of a unit cell and MIMO geometry is incorporating a simple effective ground defect structure to generate the isolation of 18 dB over the resonating spectrum. Further, the MIMO diversity characteristics have been performed and achieved good performance which indicates the proposed geometry is appropriate for wideband communication systems.