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J Electromagn Eng Sci > Volume 12(2); 2012 > Article
Journal of Electromagnetic Engineering and Science 2012;12(2):155-160.
DOI: https://doi.org/10.5515/JKIEES.2012.12.2.155   
A Wideband Circularly Polarized Pinwheel-Shaped Planar Monopole Antenna for Wireless Applications
Wang-Sang Lee, Kyoung-Sub Oh, Jong-Won Yu
Dept. of Electrical Engineering, Korea Advanced Institute of Science and Technology
Abstract
A wideband circularly polarized pinwheel-shaped planar monopole antenna fed by a wideband feeding network is presented in this paper. The proposed antenna is formed by four wideband planar monopole antenna elements with aquadruple feeding network in order to improve the performance of circular polarization. Additionally, the antenna, which is introduced here, has a high gain in the z axis direction because of its folded antenna structure. The attractive characteristics of the proposed antenna are the wide impedance bandwidth of 87.3 % (1 GHz to 2.55 GHz), the 3 dB axial ratio (AR) bandwidth of 92.3 % (1.05 GHz to 2.85 GHz), and the maximum gain within the 3 dB AR bandwidth is about 8.24 dBic.
Key words: Circular Polarization, Planar Monopole Antenna, Quadruple Feeding Network, Wideband

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