A slotted frustum-shaped 4 × 4 MIMO dielectric resonator antenna with enhanced isolation for 5G Wi-Fi applications

Abstract

In this paper, a slotted frustum-shaped 4 × 4 multiple-input multiple-output (MIMO) dielectric resonator antenna (DRA) is designed and developed for portable 5G Wi-Fi ( 5.15 − 5.85 GHz ) applications. The DRA is excited by HE M 11 δ and HE M 21 δ modes. A slotted right-angle frustum-shaped (SRFS) structure of alumina material as a dielectric resonator (DR) is positioned on the ground plane of the FR4 substrate to design a DRA. Based on the designed DRA, a compact ( 2.57 λ g × 2.57 λ g , where λ g is guided wavelength and calculated at a lower cut-off frequency, 5.0 GHz , for ϵ f of 4.4 ) 4 × 4 MIMO antenna with high isolation of greater than 27.13 dB (from 5.0 to 6.1 GHz ) and 24.3 dB (from 6.1 to 6.25 GHz ) is proposed. The developed MIMO antenna's measured working frequency ranges from 5.0 to 6.25 GHz , with an impedance bandwidth, B W i of 22.22 % , peak gain, G P of 5.85 dBi and an average peak gain, G av of 5.25 dBi . The calculated MIMO antenna's diversity performance parameters, channel capacity loss ( C CL ij ) , diversity gain ( D G ij ) , envelop correlation coefficient ( E CC ij ) , mean effective gain ( M EG i ) , total active reflection coefficient ( T ARC ) , and channel capacity ( C C ) are obtained as < 0.17 bits / sec / Hz , > 9.99 dB , < 0.0301 , < − 6.06 dB , < − 12.5 dB , and < 21.6 bits / sec / Hz , respectively. The agreement between the simulation and measurement results is found to be remarkably consistent.