Dual‐band circularly polarized MIMO DRA for sub‐6 GHz applications

Abstract

In this article, a dual‐band circularly polarized multiple‐input‐multiple‐output (MIMO) dielectric resonator antenna (DRA) is proposed for 3.5 and 5.5 GHz bands, both being located under 6 GHz. Known as sub‐6 (or as mid‐band), they provide good coverage and capacity in the newly targeted fifth‐generation (5G) systems. The proposed structure consists of two ring DRAs (RDRAs) etched on a 0.8 mm thick RT Duroid substrate. Measured impedance bandwidths in broadside direction are 3.1‐3.75 GHz (19%) and 5.3‐5.6 GHz (9.4%) and circular polarization (CP) bandwidths are 3.425‐3.6 GHz (5%) and 5.45‐5.55 GHz (2%), respectively. CP is achieved by exciting HE modes using two probes placed orthogonaly to each other, that is, at an azimuthal angular distance of 90∘. Varying the lengths of the probe allows achieving the necessary time‐phase quadrature between modes. Comparison between recent multiband circularly polarized MIMO DRAs and proposed prototype has revealed that CP bandwidth in both bands is one of the highlighting advantages of the present configuration.

MIMO Dielectric Resonator Antennas for 5G Applications: A Review

“…In [55], a dual-band circularly polarized MIMO DRA for sub-6 GHz 5G applications was presented. The design featured two ring DRAs on a substrate, excited by arc-shaped microstrip feed lines with conformal probes as shown in Figure 11.…”

Decoupling and Cloaking of Rectangular and Circular Patch Antennas and Interleaved Antenna Arrays with Planar Coated Metasurfaces at C-Band Frequencies—Design and Simulation Study

“…The decoupling and suppression of cross-band scattering in antennas is also achieved through various devices and methods, as described in [ 37 , 38 , 39 , 40 , 41 ]. Besides this, in lieu of traditional metal antennas, efforts have been focused on dielectric resonator antennas (DRAs), especially for high micro-wave and millimeter-wave spectrum applications [ 42 , 43 , 44 ]. However, this is beyond the scope of our study, wherein we deal with the reduction of mutual coupling and scattering suppression in the case of microstrip patch antennas operating at two distinct frequencies.…”

Metasurface-based dual-sense circularly polarized antenna for MIMO/full-duplex applications

“…Unlike linearly polarized (LP) antenna designs, it is challenging to apply self-decoupling methods to CP antennas [ 27 ], which is why decoupling networks are the most appropriate approach in CP microstrip patch configurations. The use of DGS structures has been implemented in [ 28 , 29 ]. However, those designs can operate in narrow BWs of less than 2%.…”