A Mechanically Fixed Radar Antenna with Scanning Capability
Abstract
An antenna system with cylindrical symmetry was analyzed because the 3-dimensional problem reduces to one of two dimensions and simplifies the mathematics. The geometry is shown. The focal length f of the reflector, a parabolic cylinder, and its aperture width 2a were set equal to 30 and 60 lambda respectively. This was illuminated by an array of line sources located in a plane normal to the focal plane of the parabolic cylinder and a distance R from the vertex. Each line source, located a distance sigma from the focal plane, was assumed to be a horn having a radiation pattern in the plane of the parabola given by the gain function g(alpha) = cos sg alpha. This was chosen because it approximated the pattern of an open ended waveguide.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 16, 1961
- Accession Number
- AD0266048
Entities
People
- L. J. Ricardi
- R. N. Assaly
- W. C. Danforth Jr.
Organizations
- Massachusetts Institute of Technology