Multi-Band Circularly Polarized Cylindrical Dielectric Resonator Multiple Input Multiple Output Antenna For 5G and X-Band Applications

The aim of this research work is to presents cylindrical-shaped dielectric resonator (DR) circularly polarized (CP) multiple input multiple output (MIMO) antenna for 5G wireless and X-band satellite communication application. The MIMO structure comprises of two antenna elements namely Ant#1 and Ant#2 fabricated on FR-4 substrate having designed footprint of
$85\times 40\times 8.8\text{mm}^{3}$
. Ant#1 and Ant#2 are twin radiators consisting of omega-shaped radiator engraved in between two mirror S-shaped strips (excited by microstrip transmission line) to induce 10dB impedance bandwidth of 13.16% (4.40 - 5.02) GHz in 5G wireless band, as well as 7.12% (7.85 - 8.43) GHz and 10.96% (9.05 - 10.10) GHz in X-band satellite communication. Moreover, the CP radiations are achieved by loading DR consisting of lossy Alumina material occupying an area of
$\pi\times 5.5^{2}\times 8\ \text{mm}^{2}$
on the top of a circular ring inside each radiator. Further, to achieve a good isolation of −20dB throughout the operating bands an elliptical structure with T slot as a decoupling structure is designed on back side of MIMO antenna.