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Sensors 2018, 18(5), 1576; https://doi.org/10.3390/s18051576

Broadband Circularly Polarized Slot Antenna Loaded by a Multiple-Circular-Sector Patch

School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 440-746, Korea
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Received: 8 March 2018 / Revised: 28 April 2018 / Accepted: 10 May 2018 / Published: 15 May 2018
(This article belongs to the Section Physical Sensors)
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Abstract

In this paper, a microstrip-fed broadband circularly polarized (CP) slot antenna is presented. CP operation can be attained simply by embedding an S-shaped strip. By loading with a multiple-circular-sector patch, which consists of 12 circular-sector patches with identical central angles of 30° and different radii, the 3 dB axial ratio (AR) bandwidth is significantly broadened. To validate the performance of the proposed antenna, an antenna prototype is fabricated and tested. The fabricated antenna is 54 mm × 54 mm × 0.8 mm in size. The measured −10 dB reflection and 3 dB AR bandwidths are 81.06% (1.68–3.97 GHz) and 70.55% (1.89–3.95 GHz), respectively. Within the 3 dB AR bandwidth, the measured peak gain is 3.81 dBic. Reasonable agreement is also obtained between the measured and simulated results. View Full-Text
Keywords: broad bandwidth; circular polarization; microstrip feed line; multiple-circular-sector configuration; slot antenna broad bandwidth; circular polarization; microstrip feed line; multiple-circular-sector configuration; slot antenna
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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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Trinh-Van, S.; Yang, Y.; Lee, K.-Y.; Hwang, K.C. Broadband Circularly Polarized Slot Antenna Loaded by a Multiple-Circular-Sector Patch. Sensors 2018, 18, 1576.

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