Anastigmatic three-dimensional bootlace lens

Details Anastigmatic three-dimensional bootlace lens Anastigmatic three-dimensional bootlace lens

1979-10-25

1981-09-08

Lieberman, Eli

Communications: radio wave antennas

Antennas

With spaced or external radio wave refractor

343911L, H01Q 1906

Patent

active

042887950

ABSTRACT:
A three-dimensional bootlace lens with minimum possible focusing aberrati, minimum possible focusing size and minimum possible dielectric loading. 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 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.

REFERENCES:
patent: 3230536 (1966-01-01), Cheston

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