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This paper presents rf index-of-refraction data for metallic delay-lens media containing square and circular obstacles. The equipment used in measuring this data is described, and the necessary correction formulas are given. The test specimens consisted of alternate layers of polyfoam spacers and thin polystyrene sheets imprinted with conducting obstacles. The data may be extended readily to other techniques of fabrication.
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S.B. Cohn (1953) studied this question.
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