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A 3-D Meandered Probe-Fed Dual-Band Circularly Polarized Dielectric Resonator Antenna

1
School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 440-746, Korea
2
Division of Electronics and Electrical Engineering, Dongguk University, Seoul 100-715, Korea
3
Electrical Environment Research Center, Korea Electrotechnology Research Institute, Changwon 51543, Korea
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(8), 2421; https://doi.org/10.3390/s18082421
Received: 29 June 2018 / Revised: 21 July 2018 / Accepted: 22 July 2018 / Published: 25 July 2018
(This article belongs to the Special Issue Antenna Technologies for Microwave Sensors)
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Abstract

A dual-band circularly polarized (CP) dielectric resonator antenna (DRA) designed on multi-layer substrates is proposed. An asymmetric C-shaped metallic strip is also incorporated into the upper side of the top substrate in the proposed design. The hexagonal dielectric resonator (DR) is excited by the proposed 3-D meandered probe, which generates multiple orthogonal TE-modes. It is found that the lower CP band arises due to the pair of fundamental modes of the hexagonal DR. In the upper CP band, pairs of higher broadside and even modes of the hexagonal DR are combined with a CP band that is induced by the asymmetric C-shaped metallic strip to yield a wide 3 dB axial ratio bandwidth (ARBW). A prototype of the proposed DRA is fabricated for experimental verification. The antenna exhibits a measured −10 dB reflection bandwidth of 56.43% (2.15–3.84 GHz). The far-field measurement shows measured 3 dB ARBWs of 7.56% (2.29–2.47 GHz) with a peak gain of 5.6 dBic and 16.47% (3.12–3.68 GHz) with a peak gain of 7.84 dBic in the lower and upper bands, respectively. View Full-Text
Keywords: broadband antenna; dielectric resonator antenna; dual-band circular polarization; hybrid antenna; multi-layer design; 3-D meandered probe feeding broadband antenna; dielectric resonator antenna; dual-band circular polarization; hybrid antenna; multi-layer design; 3-D meandered probe feeding
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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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Altaf, A.; Jung, J.-W.; Yang, Y.; Lee, K.-Y.; Yi, S.-H.; Hwang, K.C. A 3-D Meandered Probe-Fed Dual-Band Circularly Polarized Dielectric Resonator Antenna. Sensors 2018, 18, 2421.

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