The open cassegrain antenna: Part II. structural and mechanical evaluation

The mechanical features of a preliminary concept for an open cassegrain antenna are discussed briefly. In the analysis, emphasis is given to the upper rotating structure, where the major problems are the provision for an efficient back-up structure for the main reflector and the selection of a suitable subreflector support structure. The philosophy and method of approach are described in detail. Representative deflection results are given for both gravity and wind loading. Other mechanical considerations pertinent to this configuration are discussed in general. The structural implications of exposed operation, in particular those due to wind, are considered at some length. The mechanical feasibility of this configuration is demonstrated by the current results.