H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
H01Q 15/22 (2006.01)
Patent
CA 2062029
ABSTRACT A Circular Polarization Selective Surface (CPSS) for circular polarized electromagnetic waves is formed from a number of resonating elements arranged in a plane. This type of surface may be used in a wide range of reflector antennas. Each resonating element is formed from a number of electrically conductive segments connected end-to-end one to the other with each segment having a predetermined length and having a total approximate length of 1 .lambda.. A central segment having a length of about 1/4 .lambda. determines the resonant frequency for the element. This central segment extends parallel to the z-axis of a right-hand set of three mutually perpendicular axis x; y and z wherein the circular polarized electromagnetic wave is directed along the z-axis. A second segment is connected to one end of the central segment and extends parallel to the x-axis with a third segment being connected to the other end of the central segment extending parallel to the y-axis. Shorter segments connected to outer ends of the second and third segments extend parallel to the z-axis and toward each other so that a free end of one shorter segment can be collected to a free end of a shorter segment of an adjacent resonating element forming a spiral which can be mechanically supported at its outer ends. This eliminates the need for having support structures in the active area of the surface.
As Represented By The Ministe R. Of National Defence Her Majesty The Queen In Right Of Canada
Kelly H.a.
Morin Gilbert A.
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