Circular polarized cylindrical dielectric resonant antenna for 5g applications

Abstract

This study compared two different excitation methods and three different designs of a Circular Polarized Cylindrical Dielectric Resonant Antenna (DRA) which operates at the 5G frequency bands which are the C-Band range of 3.5 GHz. Due to the expansion of 5G and advancements in Internet of Things (IoT) technologies, more and more wireless digital electronic devices which are agile with minimal power consumption are required. As the 5G spectrum moves into higher frequency ranges, previous antenna design methods such as microstrip patch antenna using metallic substrate suffer from significant losses. In addition to that, the profile and dimension of the antennas also needs to be minimized to be fitted inside various miniature devices. Numerous articles are now available on the design of microstrip patch antennas for 5G application. However, studies into dielectric resonant antenna for 5G applications are still upcoming and that will be the main discussion of this paper. The objective of this paper is to simulate and design a cylindrical dielectric resonant antenna which is circularly polarized and compare the radiation effects that it produces via different types of excitation methods used. A cylindrical DRA fed via slot aperture coupled technique has been proposed. In order to make the cylindrical DRA circularly polarized, the slot underneath the DRA has been modified into a U-shaped slot and the DRA has been modified to include a hollow cylindrical space in the centre to improve its bandwidth and gain. It has been found that the inclusion of a hollow space in the centre of DRA and modification of the slot produces a circularly polarized DRA with 270 MHz bandwidth for the centre frequency of 3.5 GHz. The design of this structure can be proposed for 5G application in the C-Band spectrum.