Antenna for Ultra-Wideband Applications With Non-Uniform Defected Ground Plane and Offset Aperture-Coupled Cylindrical Dielectric Resonators

Abstract

A new compact Cylindrical Dielectric Resonator Antenna (CDRA) with a defected ground for ultra-wideband applications is presented. The structure is based on two cylindrical dielectric resonators asymmetrically located with respect to the center of an offset rectangular coupling aperture, with consideration of three and four Dielectric Resonators (DR). The resonant modes generated by the defected ground are studied and investigated. A parametric optimization study of the antenna design has been carried out to determine the optimal dimensions of the defected ground plane, resulting in an impedance bandwidth of over 133% that covers the frequency band from 3.6 GHz to 18.0 GHz. A power gain of about 7.9 dBi has been achieved. Design details and measured and simulated results are presented and discussed. INDEX TERMS Cylindrical dielectric resonators antenna, ultra-wideband, defected ground structure.

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“…Therefore, special emphasis is placed on incessant developments to overcome these drawbacks. Various techniques have been proposed to improve the bandwidth performances of these antennas, such as the application of the defected ground structure (DGS), 1–3 the introduction of metamaterials, 4 the use of parasitic elements, 5,6 slots etching in the patch, 7 fractals, 8 and multidielectric resonators technology 9 …”

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