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This article investigates a dual band multiple input multiple output (MIMO) cylindrical dielectric resonator antenna (cDRA) for WLAN and WiMAX applications. It consists of two symmetrical orthogonally placed radiators. Each radiator is excited through a narrow rectangular aperture with the help of a microstrip line. For higher mode excitation, the proposed structure uses dual segment DRA which apparently looks like stacked geometry. The aperture fed dielectric resonator works as a feed for upper cDRA to generate higher order mode. The presented radiator covers the band between 3.3‐3.8 GHz and 5‐5.7 GHz. The measured isolation is better than 20 dB in the desired band. The average gain and radiation efficiency achieved for the proposed antenna is 6.0 dBi and 85%, respectively at the operating frequency band. In the proposed geometry, broadside radiation patterns are achieved by exciting HEM11δ and HEM12δ modes in a stacked geometry. Different MIMO performance parameters (ECC, DG, MEG, and CCL) are also estimated and analyzed. The prototype of proposed antenna is fabricated and tested. The measured outcomes are in good accord with the simulated one.

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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).

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