Low Side-Lobe Circularly-Polarized Phased Arrays Using a Random Sequential Rotation Technique

A novel technique is presented for sidelobe and axial ratio control of circularly-polarized phased array antennas. Although our new random sequential rotation (RSR) concept uses a regular periodic array grid, it provides similar properties as randomly-spaced array antennas. In this way, a wideband b...

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Veröffentlicht in:IEEE transactions on antennas and propagation 2014-12, Vol.62 (12), p.6476-6481
Hauptverfasser: Smolders, A. B., Visser, H. J.
Format: Artikel
Sprache:eng
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Zusammenfassung:A novel technique is presented for sidelobe and axial ratio control of circularly-polarized phased array antennas. Although our new random sequential rotation (RSR) concept uses a regular periodic array grid, it provides similar properties as randomly-spaced array antennas. In this way, a wideband behavior is provided, without the appearance of grating lobes. In addition, the gain is maximized, since a uniform amplitude distribution is used. A 4 GHz prototype consisting of 16 aperture-coupled microstrip antennas with a beamformer was developed to demonstrate the basic properties of RSR array antennas. Although the element spacing is much larger than half a wavelength, well-controlled sidelobes are provided, even in the worst-case diagonal plane. The measured cross-polarization level at 4 GHz is below -20 dB at a 20-degree scan angle in the diagonal-plane.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2014.2359476