A Wideband SDIFS-DR-MIMO Antenna with Pattern Diversity for 5G Sub-6 GHz and 6G Band Applications

This article presents a coplanar waveguide-fed slotted double-inverted frustum-shaped (SDIFS) dielectric resonator (DR) MIMO (SDIF-DR-MIMO) antenna, designed with pattern diversity for the applications of 5G sub-6 GHz and 6G bands. Two inverted frustum-shaped conical DRs are positioned with their base and apex aligned to form the proposed SDIFS-DRMIMO antenna. The presented SDIFS-DR-MIMO antenna is excited by dual hybrid HEM
$11_\delta$
and HEM
$12_\delta$
modes at 5.8 GHz and 9.3 GHz, respectively. Using the intended dielectric resonator antenna (DRA), a compact 4 × 4 SDIFS-DR-MIMO antenna with a high isolation of 23.86 dB is proposed for the measured operating frequency band (OFB) of 5.34 GHz to 9.6 GHz (57.02%). This proposed SDIFS-DR-MIMO antenna maintains omnidirectional-like radiation patterns with pattern diversity. The dimensions of the SDIFS-DR-MIMO antenna are given by 6.88λ
g
× 1.66λ
g
× 0.55λ
g
, where λ
g
represents the guided wavelength at a lower cutoff frequency of 5.34 GHz, corresponding to an effective permittivity of 7.1. The calculated MIMO diversity performance parameters are also presented in this manuscript. The proposed SDIFS MIMO-DRA prototype has been developed to validate the simulated antenna results compared to the measured results.