Abstract

This paper presents a compact multiple-input multiple-output (MIMO) two-element dielectric resonator antenna (DRA) for wideband (WB) and ultra-wideband (UWB) operations. The dielectric resonators (DRs) are fabricated on the top side of the low-cost substrate (FR4) and the etched ground plane on the bottom of the substrate. Featuring two compact U-shaped DRs with a U-shaped defective ground surface (DGS) it has a wide impedance bandwidth of 112.84% (3.02–10.88 GHz). When the diode is connected between U-shaped metallic parasitic strips and the feedline edge, it provides a wide impedance bandwidth of 23.62% (5.6–7.1 GHz). Two parasitic metal elements are placed on the upper surface of the DR to improve the transmission coefficient better than −22 dB between the two ports. This compact antenna has a total volume of 4704.55 mm3 (29 × 29 × 5.594). The proposed MIMO DRA has WB and UWB features, making it easy to monitor and detect signals in the environment.

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