Dual-Fed C-DRA Loaded by Modified Circular Patch Antenna

Abstract

This paper presents a cylindrical-dielectric resonator antenna (C-DRA) loaded by a circular patch for emerging wide-band wireless communications. To generate a polarization diversity pattern, the proposed antenna is fed by two orthogonal aperture-coupled feeding slots. The slots' shape and position were chosen to achieve the best operating bandwidth and isolation between the two feeds. A circular patch with crossed dumbbell-shaped slots was etched to achieve high polarization purity. Ansys EDT full wave simulator was used to design and optimize the proposed antenna. Simulation results demonstrate that the proposed antenna achieves a 2 GHz impedance bandwidth (26.64 GHz – 28.69 GHz) centered at 27.6 GHz, with isolation between the two feeding ports better than 25 dB over the operational bandwidth, implying that the antenna can achieve pure diverse polarization (Axial Ratio (AR) less than 0.1 dB) with total gain more than 6 dB over the operating frequency bandwidth. The proposed antenna is a good building component for the next 5G wireless communications technology as well as Ka-band satellite communications.