Circularly polarized (CP) large array antennas are often used in both TLC and Radar applications (see eg meteorological anti-clutter radar, or satellite-Earth TLC links). Sometimes, the insertion of a LP-to-CP passive polarizer on top of linearly polarized (LP) array can be a low-cost strategy to modify already designed antennas. In this work, we suggest the use of a metamaterial LP-CP polarizer constituted by a multisurface metamaterial slab to be placed on top of a linearly polarized high-gain array.Planar polarizers may be realized by using cascade of Frequency Selective Surfaces (FSS); for this kind of polarizers the challenging issue is usually represented by the operational bandwidth and the angular stability. Improved performances can be obtained by substituting the FSS with metasurfaces, ie periodic surfaces whose elements (slots or patches) are small in terms of a wavelength.
1 Jan 2013
2013 IEEE International Symposium on Antennas Propagation