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.
Highlights
With the rapid development of wireless communication systems, the demand for high efficiency, wideband, and compact antennas has increased significantly [1,2]
We propose a wideband circularly polarized (CP) dielectric resonator antennas (DRAs) which uses a specially-shaped dielectric resonator (DR), referred to as a multiple-circular-sector DR
It is evident that the proposed antenna is an left-handed circular polarization (LHCP) antenna, and that the radiation patterns are directional toward the broadside direction
Summary
With the rapid development of wireless communication systems, the demand for high efficiency, wideband, and compact antennas has increased significantly [1,2]. The technique for realizing circular polarization through a DRA mostly requires either modifying the excitation mechanism or using a specially-shaped dielectric resonator (DR). Designs of CP DRAs with specially-shaped DRs fed by the aperture-coupled feeding technique were investigated. We propose a wideband CP DRA which uses a specially-shaped DR, referred to as a multiple-circular-sector DR. Circular polarization is achieved in this design by optimizing the radii of the twelve circular-sector DRs using a genetic algorithm (GA), a technique which has been applied to solve many antenna optimization problems [17,18]. The proposed antenna was excited by the coupling between a narrow rectangular slot etched on the ground plane and a 50-Ω microstrip feeding line located underneath the slot.
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