Accession Number : ADD008931

Title :   Anastigmatic Three-Dimensional Bootlace Lens.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Shelton,J Paul

Report Date : 08 Sep 1981

Pagination or Media Count : 8

Abstract : A three-dimensional bootlace lens with minimum possible focusing aberrations, minimum possible focusing size and minimum possible dielectric loading is disclosed. The feed and lens surfaces are in the shape of a spherical cap and covered by contiguous arrays of radiators. The region between the inner surfaces of the lens is filled with a nonuniform dielectric material with an index of refraction which constantly changes from the center line outwardly. Lens ports are connected to a radiating antenna array by means of a coaxial transmission lines all of which have the same length. The axial feed point has a focusing performance which is perfect. For all other points the lens is free of all first-order aberrations except coma. The outputs of the lens can be used to feed a planar radiating antenna array so as to produce a multiple directive beam in one angular dimension or to feed a circular array so as to make it amenable to scanning or multibeam feed systems that are used with linear arrays.

Descriptors :   *Patents, *Lens antennas, *Antenna feeds, *Multiple beam antennas, Focusing, Three dimensional, Refractive index, Coaxial cables, Transmission lines, Linear arrays, Antenna arrays, Beam steering, electrical loads

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE