Range focus lens

Details Range focus lens Range focus lens

1978-08-25

1980-08-19

Moore, David K.

Communications: radio wave antennas

Antennas

Measuring signal energy

343 18A, 343911R, H01Q 128

Patent

active

042186838

ABSTRACT:
Various aspects of electro-magnetic testing are facilitated by inserting a foamed plastic dielectric lens at a particular position between a particular radiating source and the test aperture. The lens is constructed according to electro-optic formulae and the radiation wavelength to produce a plane wave of uniform phase. To control extraneous energy contributed by reflections from the flat face of the lens, this surface is provided with two layers of high-performance absorber material. The amplitude characteristics in the test region are controlled by appropriate selection of the source antenna. Radiation-absorbent material is also provided to eliminate amplitude distortion. This makes possible testing under far-field conditions in test cells of modest size, which has heretofore been possible only with elaborate parabolic reflectors. Weather restrictions on use of free-space ranges, the sheer size of such ranges, and security problems attendant on their use, are all thus avoided. The lens can be manufactured from any plastic having a suitable dielectric constant, by either blowing the plastic in a suitable mold, or by machining from a preformed foam block. The absorber layers are loaded with conductive carbon to provide desired insertion loss and attached to the flat face.

REFERENCES:
patent: 2511610 (1950-06-01), Wheeler
patent: 2577619 (1951-12-01), Kock
patent: 2596251 (1952-05-01), Kock
patent: 2887684 (1959-05-01), Dexter et al.
patent: 3101472 (1963-08-01), Goubau
patent: 3290598 (1966-12-01), Thomas
patent: 3302205 (1967-01-01), Johnson
Kouyoumjian et al., "Range Requirements in Radar Cross Section Measurements," Proceedings of the IEEE 5/65, pp. 920-928.
Mentzer, J. R., "The Use of Dielectric Lenses in Reflection Measurements," Proceedings of the IRE, 9/52, pp. 252-256.

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