A POINT SOURCE BINORMAL LENS WITH WIDE-ANGLE FOCAL POINTS
Abstract
An experimental model circlet lens was constructed from 561 lengths of square tubing of 0.700 + or - 0.002-in. id and 0.010 + or - 0.002-in. wall thickness. Both inner and outer faces of the lens are continuous portions of ellipsoids. Test patterns were made at the design wave length of 2.963 cm. The feed used was a rectangular horn flared to produce an illumination approximately 10 db down from peak power at the edges of the lens in both the electric and the magnetic planes. A set of patterns was taken for comparison of the circlet lens with the point source binormal lens (AFCRC report no. E5067). The over-all performance of the circlet lens closely paralleled that of the point source lens, but had improved gain for off-axis positions and decreased coma-lobe level with vertical polarization. Experimental and theoretical phase-error contours are plotted for the circlet lens. The geometry of the lens is completely defined by general equations for this type of design.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1953
- Accession Number
- AD0013478
Entities
People
- Ellen Fine
- George E. Reynolds
Organizations
- Air Force Cambridge Research Laboratories