Open Access

ARTICLE

Reconfigurable Compact Wideband Circularly Polarised Dielectric Resonator Antenna for Wireless Applications

Shahid Khan^1,*, Xin Cheng Ren², Haider Ali³, Camel Tanougast¹, Abdul Rauf⁴, Safdar Nawaz Khan Marwat⁵, Muhammad Rizwan Anjum⁶
1 LCOMS, ASEC, University de Lorraine, Metz, 57070, France
2 School of Physics and Electronic Information, Yanan Univeristy, Yanan, 761000, China
3 Department of Electronics Technology, University of Technology, Nowshera, 24100, Pakistan
4 Department of Electrical Engineering, National University of Sciences and Technology, Islamabad, 44000, Pakistan
5 Department of Computer Systems Engineering, University of Engineering and Technology, Peshawar, 25120, Pakistan
6 Department of Electronic Engineering, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan
* Corresponding Author: Shahid Khan. Email:
(This article belongs to this Special Issue: Advances in 5G Antenna Designs and Systems)

Computers, Materials & Continua 2021, 68(2), 2095-2109. https://doi.org/10.32604/cmc.2021.016811

Received 12 January 2021; Accepted 20 February 2021; Issue published 13 April 2021

Abstract

In this work, a novel compact wideband reconfigurable circularly polarised (CP) dielectric resonator antenna (DRA) is presented. The L-shaped Dielectric resonator antenna is excited by an inverted question mark shaped feed. This arrangement of feed-line helps to generate two orthogonal modes inside the DR, which makes the design circularly polarised. A thin micro-strip line placed on the defected ground plane not only helps to generate a wideband response but also assist in the positioning of the two diode switches. These switches located at the left and right of the micro-strip line helps in performing two switching operations. The novel compact design offers the reconfigurability between 2.9–3.8 GHz which can be used for different important wireless applications. For the switching operation I, the achieved impedance bandwidth is 24% while axial ratio bandwidth (ARBW) is 42%. For this switching state, the design has 100% CP performance. Similarly, the switching operation II achieves 60% impedance bandwidth and 58.88% ARBW with 76.36% CP performance. The proposed design has a maximum measured gain of 3.4 dBi and 93% radiation efficiency. The proposed design is novel in terms of compactness and performance parameters. The prototype is fabricated for the performance analysis which shows that the simulated and measured results are in close agreement.

---

Keywords

Circularly polarized; DRA; ARBW; bandwidth; gain; radiation efficiency

---