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Sensors 2016, 16(11), 1849; doi:10.3390/s16111849

A Wideband Circularly Polarized Antenna with a Multiple-Circular-Sector Dielectric Resonator

School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 440-746, Korea
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Academic Editor: Stephane Evoy
Received: 22 August 2016 / Revised: 27 October 2016 / Accepted: 28 October 2016 / Published: 3 November 2016
(This article belongs to the Special Issue Resonator Sensors)
View Full-Text   |   Download PDF [1175 KB, uploaded 3 November 2016]   |  

Abstract

This paper presents the design of a wideband circularly polarized antenna using a multiple-circular-sector dielectric resonator (DR). The DR is composed of twelve circular-sector DRs with identical central angles of 30 but with different radii. A genetic algorithm is utilized to optimize the radii of the twelve circular-sector DRs to realize wideband circular polarization. The proposed antenna is excited using an aperture-coupled feeding technique through a narrow rectangular slot etched onto the ground plane. An antenna prototype is experimentally verified. The measured −10 dB reflection and 3 dB axial ratio (AR) bandwidths are 31.39% (1.88–2.58 GHz) and 19.30% (2.06–2.50 GHz), respectively, covering the operating bands of the following systems: UMTS-2100 (2.145 GHz), WiMAX (2.3 GHz), and Wi-Fi (2.445 GHz). A measured peak gain of 7.65 dBic at 2.225 GHz and gain variation of less than 2.70 dBic within the measured 3 dB AR bandwidth are achieved. In addition, the radiation patterns of the proposed antenna are presented and discussed. View Full-Text
Keywords: aperture-coupled feeding; circular polarization; dielectric resonator antenna; multiple-circular-sector structure; wide bandwidth aperture-coupled feeding; circular polarization; dielectric resonator antenna; multiple-circular-sector structure; wide bandwidth
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Trinh-Van, S.; Yang, Y.; Lee, K.-Y.; Hwang, K.C. A Wideband Circularly Polarized Antenna with a Multiple-Circular-Sector Dielectric Resonator. Sensors 2016, 16, 1849.

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