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International Journal of Antennas and Propagation
Volume 2016, Article ID 9071610, 8 pages
http://dx.doi.org/10.1155/2016/9071610
Research Article

A Novel Dual-Band Circularly Polarized Rectangular Slot Antenna

1CAST-Xi’an Institute of Space Radio Technology, Xi’an, Shaanxi 710100, China
2AVIC-Xi’an Flight Automatic Control Research Institute, Xi’an, Shaanxi 710065, China
3National Laboratory of Antennas and Microwave Technology, Xidian University, Xi’an, Shaanxi 710071, China

Received 21 November 2015; Revised 9 March 2016; Accepted 7 April 2016

Academic Editor: Renato Cicchetti

Copyright © 2016 Biao Li et al. 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.

Abstract

A coplanar waveguide fed dual-band circularly polarized rectangular slot antenna is presented. The proposed antenna consists of a rectangular metal frame acting as a ground and an S-shaped monopole as a radiator. The spatial distribution of the surface current density is employed to demonstrate that the circular polarization is generated by the S-shaped monopole which controls the path of the surface currents. An antenna prototype, having overall dimension 37 × 37 × 1 mm3, has been fabricated on FR4 substrate with dielectric constant 4.4. The proposed antenna achieves 10 dB return loss bandwidths and 3 dB axial ratio (AR) in the frequency bands 2.39–2.81 GHz and 5.42–5.92 GHz, respectively. Both these characteristics are suitable for WLAN and WiMAX applications.