Design of the AN/SPS-2 Antenna
Abstract
An antenna has been designed to meet the requirements of the final version of the AN/SPS-2 radar system. The paraboloidal reflector has a diamond contour 40 feet wide by 20 feet high and a focal length of 16 feet 3 inches, The feed assembly consists of an array of seven horns stacked in a vertical line through the focus. During the transmitter pulse the horns are excited with the relative amplitudes and phases necessary to generate a vertical pattern giving constant-altitude coverage to an elevation angle of 21 degrees. Power division is accomplished with a 3-db directional coupler developed by H. J. Riblet. Phase adjustments are made with hairpin sections of waveguide. When the magnetron is not firing, the seven horns are connected to separate receivers, and target height is computed from the video signals. Adjacent receiving beams cross at the 4-db levels, alternate beams at the 14-db level. The vertical (H-plane) aperture of the feed horns is chosen to maximize their directivity. The reflector is modified by the addition of a cylindrical phasing-strip to produce vertical patterns suitable for height finding. Transmitting, receiving, and composite contours of equal intensity are plotted.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 04, 1951
- Accession Number
- AD1215903
Entities
People
- J. R. Shoemaker
- R. J. Adams
Organizations
- United States Naval Research Laboratory