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Design Equation for Multidielectric Fresnel Zone Plate Lens

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2 Author(s)
Hristov, H.D. ; Dept. de Electron., Group of Commun., Univ. Tec. Federico Santa Maria, Casilla, Chile ; Rodriguez, J.M.

A structural design equation for multidielectric Fresnel zone plate (ZP) lens is outlined in this letter. Based on this equation, multidielectric ZP lenses/lens antennas are studied numerically in the 30-50 GHz microwave band and contrasted to an ordinary plano-convex lens/lens antenna. Usually, the ZP lens is made half-wavelength thick but we discovered that a similar wavelength thick lens can be built with lower-permittivity dielectrics, and that this lens can focus more efficiently. In a confined frequency band, the thin and light-weight multidielectric ZP lens of four or more dielectric rings per full-wavelength zone is comparable in focusing to the ordinary bulky lens.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:22 ,  Issue: 11 )