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    Double-sided split-step MM-wave Fresnel lenses: design, fabrication and focal field measurements
    (European Optical Society : Rapid Publications, 2014-09) Yurchenko, V. B.; Ciydem, M.; Gradziel, M.; Murphy, J. A.; Altintas, A.
    Design, fabrication and focal field measurements of W-band Fresnel lenses to produce well-shaped Gaussian beams in the focal domain are presented. Two lenses, one of Teflon and another of Polyamide, have been compared in their performance with a double-sided Fresnel lens of different design, with full height of Fresnel steps. Experiments show that a good focusing ability of all the lenses is achieved. They produce the target beam according to the design. Yet, the lenses of split-step design are thinner, have lower insertion losses, and a greater focal depth as compared to more conventional Fresnel lenses.