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International Journal of Antennas and Propagation
Volume 2016, Article ID 3531089, 10 pages
http://dx.doi.org/10.1155/2016/3531089
Research Article

Dual-Band Operation of a Circularly Polarized Four-Arm Curl Antenna with Asymmetric Arm Length

Department of Electrical and Computer Engineering, Ajou University, 5 Woncheon-dong, Yeongtong-gu, Suwon 443-749, Republic of Korea

Received 20 September 2015; Accepted 27 December 2015

Academic Editor: Shah N. Burokur

Copyright © 2016 Son Xuat Ta and Ikmo Park. 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

This paper presents dual-band operation of a single-feed composite cavity-backed four-arm curl antenna. Dual-band operation is achieved with the presence of the asymmetrical arm structure. A pair of vacant-quarter printed rings is used in the feed structure to produce a good circular polarization (CP) at both bands. The cavity-backed reflector is employed to improve the CP radiation characteristics in terms of the 3-dB axial ratio beamwidth and broadside gain. The proposed antenna is widely applicable in dual-band communication systems that have a small frequency ratio. Examples of such a system are global positioning systems.