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A Comparison of the Focusing Properties of a Fresnel Zone Plate With a Doubly-Hyperbolic Lens for Application in a Free-Space, Focused-Beam Measurement System

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2 Author(s)
David R. Reid ; Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA ; Glenn S. Smith

A Fresnel zone plate is designed to perform the function of a doubly-hyperbolic lens. The focusing characteristics of the zone plate and the lens are compared using both measured data and body-of-revolution finite-difference time-domain simulations. The results from this comparison are used to evaluate the use of zone plates as focusing elements in a free-space, focused-beam measurement system. A set of two zone plates is used to perform measurements of the material properties of a dielectric sheet, and the results are compared to the results from a standard system which uses two doubly-hyperbolic lenses.

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:57 ,  Issue: 2 )