A Frequency Tunable Dielectric Resonator Antenna with Reduction of Cross Polarisation for Wi MAX and Sub 6 GHz 5G Applications

Rajkishor Kumar; Avinash Chandra; Naveen Mishra; Raghvendra Kumar Chaudhary

doi:10.14429/dsj.73.18180

Rajkishor Kumar School of Electronics Engineering, Vellore Institute of Technology, Vellore, Tamil Nadu, India https://orcid.org/0000-0002-6140-1241
Avinash Chandra School of Electronics Engineering, Vellore Institute of Technology, Vellore, Tamil Nadu, India https://orcid.org/0000-0003-0708-4043
Naveen Mishra School of Electronics Engineering, Vellore Institute of Technology, Vellore, Tamil Nadu, India https://orcid.org/0000-0003-2602-0731
Raghvendra Kumar Chaudhary Department of Electrical Engineering, Indian Institute of Technology, Kanpur, India https://orcid.org/0000-0001-6186-4089

DOI: https://doi.org/10.14429/dsj.73.18180

Keywords: Frequency tunable, Dielectric resonator antenna, Slot coupled, Sub-6 GHz, 5G applications

Abstract

A frequency Tunable (mechanical tuning) Linearly Polarized (TLP) rectangular Dielectric Resonator Antenna
(DRA) coupled with a horizontal/vertical-slot and excited with circular-ring type feed is investigated in this article.
The frequency tunability (mechanical tuning) is achieved by the rotation of slot at different angles of the proposed
structure. Hence, two linearly polarized antennas have been proposed for different frequency bands such as Wi-MAX and Sub-6 GHz/5G, respectively, using slot variations (named as DRA-1 and DRA-2). TE 11δ mode has been excited in both the DRAs and confirmed by orientation of electric field inside the rectangular DRA. The measured -10 dB input impedance bandwidths of DRA-1 offer 21.60 % being centered at 2.87 GHz and the separation of co-polarized and cross-polarized field levels is above -24 dB in the broadside direction (xz-plane). Whereas DRA-2 offers measured -10 dB input impedance bandwidths of 23.03% being centered at 3.56 GHz having a separation of co-polarized and cross-polarized field levels are above -23 dB in the broadside direction (xz-plane). In addition, the proposed DRA-1 and DRA-2 show a maximum gain of 5.23 dBi and 4.75 dBi in broadside direction, respectively.