Sectorially Sorted Densely Packed 12-Port MIMO Antenna With Improved Isolation Metrics

Abstract

An intuitive approach for investigating densely packed 12-port multi-input-multi-output (MIMO) antenna is investigated with improved isolation performance. Conventional dipole antenna elements are sectorially triangulated in a (3:3:3:3) manner that are sorted into cross-shaped profile corners asserting a premium footprint. This unique topology has been acknowledged to achieve effective impedance matching and simultaneously reduce mutual coupling in the proposed cross-coupled estate avoiding any additive decoupling network. The investigation shows that dipole arrays are coupled with a lumped L-C-L arrangement, whose dominant inductive resonance are stabilized by the center-fed capacitance. The arrangement has the inherent advantage of stable impedance bandwidth (6.5–7.5) GHz and effective decoupling between radiating elements with isolation magnitude ranges (24–30) dB. The simulated performance counterparts are meticulously experimented on a fabricated prototype to observe the potential scattering, isolation, and radiation parameters. The far-field envelope correlation coefficient between antenna elements shows minimal magnitude < 0.02, exhibiting its potential for diversity parameters. The radiation peak gain shows 7.5 dBi with stable omni-directive patterns in the principal operating planes with maximum radiative efficiency (60–70)%, finding its applicability for mid-band advanced (5G) applications.