SUB-REFLECTOR SUPPORTING STRUCTURE FOR CASSEGRAINIAN ANTENNA

摘要

PURPOSE:To increase the assembling accuracy of a sub-reflector by supporting the sub-reflector of a Cassegrainian antenna with a cylinder-shaped supporting body composed of the material with a good electric wave transmissivity factor fitted at the tip part of a primary horn. CONSTITUTION:At the tip part of a primary horn 12, a flange 12b of the same shaft as the inner diameter is formed, and at the base edge part of a cylinder-shaped supporting body 16 formed by the material, in which a dielectric constant is small and the transmission factor of the electric wave is satisfactory, for example, polytetrafluoroethylene, a fiber reinforced plastic, etc., a circular recessed part 16a formed to the same shaft as the inner diameter is fitted at the flange 12 of the primary horn 12 and tightly fixed with a screw 19. On the other hand, at the inner surface of the tip part of the supporting body 16, an inner side annular recessed part 16b, in which a sub-reflector 17 is fitted and an outer side annular recessed part 16c, in which a cover 18 is fitted, are formed to the same shaft as the inner surface of the supporting body 16, the cover 8 is tightly fixed at the supporting body 16 with adhesives and the sub-reflector 17 is sandwiched ans fixed with the cover 18 and the supporting body 16.