Microstrip-fed Wideband Circularly Polarized Printed Antenna

TitleMicrostrip-fed Wideband Circularly Polarized Printed Antenna
Publication TypeJournal Article
Year of Publication2010
AuthorsBao, XL, Ammann, MJ, McEvoy, P
Journal TitleIEEE Transactions on Antennas & Propagation
Volume58
Issue10
Pagination3150-3156
Journal Date10/2010
ISSN Number0018-926X
Abstract

A wideband circularly-polarized printed antenna is proposed, which employs an asymmetrical dipole and a slit in the ground plane which are fed by an L-shaped microstrip feedline using a via. The proposed antenna geometry is arranged so that the orthogonal surface currents, which are generated in the dipole, feedline and ground plane, have the appropriate phase to provide circular polarization. A parametric study of the key parameters is made and the mechanism for circular polarization is described. The measured results show that the impedance bandwidth is approximately 1.34 GHz (2.45 GHz to 3.79 GHz) and the 3 dB axial ratio bandwidth is approximately 770 MHz (2.88 GHz to 3.65 GHz) which represent fractional bandwidths of approximately 41% and 23%, respectively, with respect to a centre frequency of 3.3 GHz.

URLhttp://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5498934
DOI10.1109/TAP.2010.2055776
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