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

摘要

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).