Title :
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
Author :
Reid, David R. ; Smith, Glenn S.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA
Abstract :
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.
Keywords :
dielectric materials; dielectric measurement; finite difference time-domain analysis; focusing; horn antennas; lens antennas; microwave materials; microwave measurement; sheet materials; zone plates; Fresnel zone plate; body-of-revolution FDTD simulations; dielectric sheet material properties; doubly-hyperbolic lens; finite-difference time-domain simulation; focusing properties; free-space focused-beam measurement system; horn antennas; Antenna measurements; Dielectric measurements; Finite difference methods; Frequency; Fresnel reflection; Lenses; Optical design; Performance evaluation; Permittivity measurement; Time domain analysis; Dielectric measurements; lenses; zone plate;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2008.2011392
