Accession Number : ADD010249

Title :   Cylindrical Microwave Lens Antenna for Wideband Scanning Applications.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Rotman,Walter ; Franchi,Peter R

Report Date : 26 Apr 1983

Pagination or Media Count : 15

Abstract : The bandwidth limitation in space fed phased arrays (that results from the use of phase shifters to implement beam steering) is overcome by a lens arrangement in which independent feeds are provided at the focal plane of the lens. Each feed generates a collimated beam in a different spatial direction. Each beam can then be steered about its central position by means of phase shifters, while retaining a substantially improved bandwidth. An algorithm is derived for designing three-dimensional (3D) microwave lenses with line source feeds by stacking a number of identical two-dimensional (2D) parallel-plate, wide-angle constrained lenses into a cylindrical antenna structure. This lens design provides focused beams over a wide range of scan angles in both elevation and azimuth with only small optical aberration. A wide variety of lens designs can be achieved through this algorithm, dependent upon the constraints which are selected for the 2D lens counterpart.

Descriptors :   *Patents, *Cylindrical antennas, *Lens antennas, *Microwave antennas, *Phased arrays, Beam steering, Radiofrequency lenses, Antenna feeds, Scanning, Cylindrical bodies, Wide angles, Phased arrays, Beams(Radiation), Microwave equipment, Focusing, Value, Phase shift circuits, Range(Extremes), Limitations, Position(Location), Elevation, Errors, Transmission lines, Broadband, Structures, Axes, Phase

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE