SECONDARY REFLECTOR FOR CASSEGRAIN-TYPE MICROWAVE ANTENNA

摘要

P It consists in providing the basic secondary reflector (103) of this antenna with a first circular ring (104) having the shape of a cylinder directed towards the main reflector, and with a second ring (105) having the shape of a circular crown fixed to the end of the cylinder and projecting outside of it. These rings are made of conductive material. The length of the cylinder and the width of the crown are of the order of a quarter of the average wavelength for which the antenna is dimensioned. It considerably reduces the "overflow radiation" of the secondary reflector and therefore has performance equal to significantly reduce the antenna dimensions. /P