Bispherical Constrained Lens Antennas
Abstract
A spherical constrained lens having two surfaces (a pickup surface and a radiating surface) of equal radii has been known to provide multiple beams in all planes. This lens is equivalent in performance to a spherical reflector antenna but has an advantages of generating multiple beams with true time delays and no feed blockage, since the feed surface is behind the pickup and radiating surfaces. An investigation has been made of a generalized bispherical constrained lens, with the radii of its two surfaces being allowd to vary. This additional degree of freedom allows flexibility in designing a multiple-beam antenna. It is shown that, for a specified radiating aperture and allowable maximum phase error, a lens with a smaller focal length F (or, equivalently, axial distance F between the feed and pickup surfaces), than that of the equal- radius lens can be obtained by increasing the radius of curvature of the radiating surface, resulting in a more compact lens. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 02, 1978
- Accession Number
- ADA060738
Entities
People
- Jaganmohan B. L. Rao
Organizations
- United States Naval Research Laboratory