Document Type

Conference Paper

Rights

This item is available under a Creative Commons License for non-commercial use only

Publication Details

In IEEE Transactions on Antennas and Propagation,St.Petersburg, June 2007, Vol.55, issue 6, part 2, pp.1760-1767. ISSN: 0018-926X Digital Object Identifier: 10.1109/TAP.2007.898575 Available from http://0-ieeexplore.ieee.org.ditlib.dit.ie/stamp/stamp.jsp?tp=&arnumber=4267894&isnumber=4267893

Abstract

A novel probe-fed single-layer annular-ring patch antenna for dual-frequency circular polarization is evaluated numerically and experimentally verified. The proposed antenna consists of a small circular patch surrounded by two concentric annular-rings, which is loaded by an unequal lateral cross-slot ground plane. The circularly-polarized frequency ratio of the two resonant modes is tunable to a small value, suitable for wireless communications systems. The patch size of the proposed antenna is reduced by about 53% compared to the conventional circular patch at a given frequency. The radiation characteristics of the novel antenna are also presented.