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A method of Fraunhofer pattern measurement is presented by which the distance between antennas may be reduced from the usual 2L2/λ to values of the order of 0.1(L2/λ). This reduction may be applied to any antenna in which the aperture plane may be physically molded about a spherical surface having a radius of curvature less than 2L2/λ. It is shown that such measurements have less inherent phase error in the region of the main lobe than the conventional measurements on a plane aperture at 2L2/λ.
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Robert W. Bickmore (1957) studied this question.
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