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International Journal of Antennas and Propagation
Volume 2015 (2015), Article ID 194682, 12 pages
Research Article

A Wide-Band Circularly Polarized Wide-Gap Antenna Loaded with a Y-Shaped Metal Strip for L-Band Application

1School of Information Science and Technology, Heilongjiang University, Harbin 150080, China
2Control Science and Engineering Post-Doctoral Research Center, Harbin Institute of Technology, Harbin 150080, China
3School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150080, China

Received 16 January 2015; Revised 14 April 2015; Accepted 28 April 2015

Academic Editor: Vincenzo Galdi

Copyright © 2015 Chun-Ying Kang 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.


A wide-band circularly polarized wide-gap antenna loaded with a Y-shaped metal strip applied to L-band is proposed in this paper. The Y-shaped metal strip coupling motivates the wide gap to achieve wide-band circularly polarized radiation. Both the simulated results by CST Microwave Studio and the measured results indicate that the antenna impedance bandwidth (reflection coefficient less than −10 dB) and axial ratio bandwidth (AR < 3 dB) are 35.9% (1.1–1.71 GHz). The antenna produces a dual circularly polarized radiation with gain of 0.8–3.2 dBic. The equivalent current array model of the antenna is also presented, which well explains the radiation characteristics of the antenna. The introduction of the metal reflecting plate makes the antenna a directional one, whose gain is above 4 dBic within the band. This design enables the satellite communication for most frequency bands with high gain, which has a vast potential for future development.