English

DTIC AD0610037: DESIGN OF METAL SPACE FRAME RADOMES

Design graphs, formulas and procedures for the design and evaluation of the electrical performance of metal space frame radomes is presented covering specifically transmission loss, boresight error, and side-lobe variation. The relative merits of metal and dielectric elements is analyzed. The study consists of developing a straight forward simple procedure for the optimum sizing of solid beam elements for large space frame radomes. Equations were derived expressing the relationship between the element dimensions necessary to satisfy a prescribed electrical transmission loss and the structural integrity of the space frame. These equations, considered as design constraints, were utilized in the selection of the element size which satisfied a defined optimum criterion. Two optimization criteria were adopted: first, the minimization of the transmission loss subject to a constraint of structural integrity and, second, the reduction of the total structural weight of the elements which simultaneously satisfy the transmission loss and structural constraint. A sample design computation was conducted as an example of the procedure. The second optimization criterion was applied to a 150 foot

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