00000nam 2200000zi 4500 9.954278 CaOODSP 20250922124609 m o d f cr bn||||||||| 250820e199511 oncad bt f000|| eng d CaOODSP eng rda CaOODSP eng eng fre n-cn--- DR52-17/67-1995E-PDF Morin, Gilbert A., 1952- author. A circular polarization selective surface made of resonant helices / by Gilbert A. Morin. Ottawa : Defence Research Establishment Ottawa, November 1995. 1 online resource (ix, 38 pages) : illustrations, charts. text txt rdacontent computer c rdamedia online resource cr rdacarrier DREO report ; no. 1269 Digitized edition from print [produced by Defence Research and Development Canada]. "PCN 05C01." Includes bibliographical references (page 11). "A circular polarization selective surface (CPSS) is a surface that reflects one sense of circular polarization but transmits the other sense. While linear polarization selective surfaces (usually abbreviated PSS) are fairly common, CPSS's have attracted attention only recently. In this report, a new CPSS with improved characteristics is presented and potential applications are discussed. This new CPSS is made of special square helices. Because the helices can be supported at their extremities, this CPSS does not need a dielectric support as other CPSS's do and therefore can be made more transparent. The response of the CPSS to a plane wave excitation was simulated using the method of moments for thin wires. Mutual coupling and losses were taken into account. Simulation results show that the radar cross-section of the surface to one circular polarization is 50 times higher than to the other polarization. A CPSS has been fabricated. Transmission measurements show that the surface permits most of one circular polarization to pass through while rejecting the other polarization. The rejection ratio is more than 15 dB. These results are in good agreement with theory. Three potential applications of CPSS's in the field of reflector antennas are reduction of sub-reflector blockage in dual reflector antennas, frequency reuse through polarization diversity in a dual-offset reflector and design of a mirror antenna for circular polarization"--Abstract, page iii. Includes abstracts in English and French. Radio waves Polarization. Radar. Ondes radioélectriques Polarisation. Radar. Defence Research Establishment Ottawa, issuing body. DREO report ; no. 1269. (CaOODSP)9.941661 PDF 1.23 MB https://publications.gc.ca/collections/collection_2025/rddc-drdc/DR52-17-67-1995-eng.pdf PCN 05C01