An empirical investigation of metallic diaphragms deformed by uniform normal pressure to produce accurate parabolic reflectors is discussed. 30-cm diameter (f/D =0.4) reflectors produced by this technique were measured mechanically and found to have maximum deviations of only 0.5 mm orλ/20at 30 GHz from a true paraboloid within a circle of 14-cm radius. Electrical measurements at 30 GHz are discussed.
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Semplak et al. (1968) studied this question.
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