Uniplanar circularly polarized slot-ring antenna architectures
Article first published online: 26 NOV 2002
Copyright 2002 by the American Geophysical Union.
Volume 37, Issue 2, pages VIC 5-1–VIC 5-10, April 2002
How to Cite
Uniplanar circularly polarized slot-ring antenna architectures, Radio Sci., 37, 8004, doi:10.1029/2001RS002569, 2002. [printed 38(2), 2003], and ,
- Issue published online: 26 NOV 2002
- Article first published online: 26 NOV 2002
- Manuscript Accepted: 5 MAY 2002
- Manuscript Revised: 21 MAR 2002
- Manuscript Received: 21 NOV 2001
 This paper presents a novel printed uniplanar antenna architecture for circular polarization. The structure consists of a single-fed slot-ring antenna with asymmetrically placed perturbations. The influence of different kinds of perturbations and substrates on the size of the antenna, its impedance bandwidth, and its axial ratio bandwidth is investigated. Various feed circuits based on coplanar waveguides (CPWs), coaxial line, and microstrip are investigated as well. Low-cost applications such as tagging antennas at 2.45 GHz are tested in combination with a coaxial line and CPW feed circuit. It was found that antennas achieving an impedance bandwidth over 60% and an axial ratio bandwidth up to 15% can be realized without the need of airbridges and rf-substrates.