Dual‐element circularly polarized multiple‐input‐multiple‐output‐dielectric resonator antenna with high interport isolation for sub‐6 GHz applications.

This work presents a dual‐element multiple‐input‐multiple‐output (MIMO) dielectric resonator antenna (DRA) for sub‐6 GHz applications. The proposed MIMO‐DRA has two major features: (i) circular polarization (CP); and (ii) high interport isolation. The proposed MIMO‐DRA is formed by two identical antenna elements. Each element is composed of a cylindrical dielectric resonator (DR) which is fed by a microstrip line via the underneath octagonal aperture. A modified L‐shaped strip along with the octagonal aperture delivers the desired CP characteristics. Meanwhile, a novel defected ground geometry (DGG) is utilized to enhance the inter‐port isolation across the operating frequency bandwidth. The proposed MIMO‐DRA has an inter‐port isolation of greater than 21 dB over the operating 10‐dB impedance band of 4.18–6.12 GHz. Furthermore, the proposed MIMO‐DRA features broadside radiation patterns, satisfactory broadside gains, and well‐acceptable values of envelope correlation coefficients (ECCs). [ABSTRACT FROM AUTHOR]