Fresnal Zones in Wireless Links, Zone Plate Lenses and Antennas

By H. Hristov. 2000

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Performance of reduced size substrate lens antennas for Millimeter-wave communications (2005, background): “In the first case, the most popular structures are the Fresnel zone plate lenses [11] (the lens is constructed with variable permittivity dielectric rings) and the Luneburg lenses [12], [13] (the index of refraction decreases from the center to the periphery of the lens).”