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International Journal of Antennas and Propagation
Volume 2016, Article ID 5950472, 7 pages
http://dx.doi.org/10.1155/2016/5950472
Research Article

The Analysis of a Wideband Strip-Helical Antenna with 1.1 Turns

1Shenzhen Key Laboratory of Antennas and Propagation, College of Information Engineering, Shenzhen University, Room No. 906, Nanhai Avenue 3688, Shenzhen, Guangdong 518060, China
2Shenzhen Key Laboratory of Antennas and Propagation, College of Electronic Science and Technology, Shenzhen University, China
3Department of Electronics and Communication Engineering, Sun Yat-Sen University, Guangzhou, China

Received 8 September 2015; Revised 15 November 2015; Accepted 20 December 2015

Academic Editor: Ahmed T. Mobashsher

Copyright © 2016 Xihui Tang 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 wideband strip-helical antenna with 1.1 turns is analyzed numerically and experimentally. By replacing the traditional wire helix with wide metallic strip, the forward traveling current on the strip helix with about one turn smoothly decays to the minimum value at the open end of the helix. Therefore, the strip helix can excite a wideband circular polarization (CP) wave with 50-ohm impedance matching. The proposed antenna is printed on a hollow-cylinder with a substrate relative permittivity of and a thickness of  mm. A 50 Ω coaxial cable is directly connected to excite the strip-helical antenna without any additional impedance matching section. The ground plane is placed below the antenna in order to provide a directional radiation pattern. To demonstrate this method, a prototype of 1.1-turn strip-helical antenna is tested. The test shows that the proposed antenna can reach an overlapped bandwidth of 46% with height of 0.52, where is the wavelength in free space at the center operation frequency.