Accession Number : AD0684845

Title :   REDUCED SIDELOBES FOR BUTLER-MATRIX-FED LINEAR ARRAYS,

Corporate Author : INSTITUTE FOR DEFENSE ANALYSES ARLINGTON VA SCIENCE AND TECHNOLOGY DIV

Personal Author(s) : Shelton,J. Paul

Report Date : DEC 1968

Pagination or Media Count : 15

Abstract : The report shows that simple transposition of the elements of a linear array fed by Butler matrix can be used to improve the sidelobe level without significant degradation of the other characteristics of the array. The beams remain collimated with gain equal to N times element gain, where N is the number of elements in the array. Beam crossover level is lowered slightly, but not so much as would be the case for a conventionally tapered aperture distribution. Improved sidelobes are obtained for N > or = 14, and data are presented for N as high as 50. Specifically, sidelobe levels of 15.54 db, 16.54 db, 17.86 db, and 18.56 db are obtained for N = 18, 31, 37, and 44, respectively. Although the improvement is modest for low N, it appears that the available improvement increases directly with N. (Author)

Descriptors :   (*ANTENNA ARRAYS, ANTENNA LOBES), LINEAR SYSTEMS, ANTENNA FEEDS, ANTENNA APERTURES, PERFORMANCE(ENGINEERING)

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE