Title :
An experimental study on 2×2 sequential-rotation arrays with circularly polarized microstrip radiators
Author :
Kraft, Ulrich R.
Author_Institution :
Daimler-Benz Aerosp. AG-Dornier Satellite Syst., Munich, Germany
fDate :
10/1/1997 12:00:00 AM
Abstract :
The radiation properties of 2×2 sequential-rotation arrays with single-feed circularly polarized patch radiators are investigated experimentally with the goal to maximize the bandwidth for an XPD⩾30 dB. Based on a particular cross-polarization discrimination (XPD) description for such arrays, the impacts of element polarization, mutual coupling, limited symmetry, and excitation errors on the array cross polarization are presented. It is shown that compact configurations can be obtained, which provide an on-axis XPD of 30 dB over up to 2.0% bandwidth and of 35 dB over up to 1.0%. These arrays exhibit copolarized sidelobes below -18 dB and off-axis peak cross-polarization levels below -20 dB
Keywords :
antenna feeds; antenna radiation patterns; electromagnetic wave polarisation; microstrip antenna arrays; bandwidth; circularly polarized microstrip radiators; copolarized sidelobes; cross polarization discrimination; element polarization; excitation errors; experimental study; limited symmetry; mutual coupling; off axis peak cross polarization; radiation properties; sequential-rotation arrays; single-feed patch radiators; Bandwidth; Electromagnetic coupling; Electromagnetic wave polarization; Feeds; Microstrip antenna arrays; Microstrip antennas; Microstrip components; Mutual coupling; Patch antennas; Power dividers;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
