Accession Number : AD0275353

Title :   ELECTRONIC SCANNING OF CIRCULAR LOOP ARRAYS

Descriptive Note : Scientific rept.,

Corporate Author : TENNESSEE UNIV KNOXVILLE ENGINEERING EXPERIMENT STATION

Personal Author(s) : STEPHENS,D.R. ; KENNEDY,E.J. ; NEFF,H.P. JR.

Report Date : 01 MAR 1962

Pagination or Media Count : 61

Abstract : An analysis is presented of concentric circular loop antenna arrays. The configuration which is considered consists of a number of concentric loop antennas with circumferences which are an integral number of wavelengths. These loop antennas provide radiation patterns whose principal terms are cos n, cos 2n, cos 3n, and cos kn in general. If an additional radiator is used to provide a non-directional pattern with respect to azimuth angle, n, then a radiation pattern of the for of a Fourier series may be obtained. The usual method is to utilize the Tchebyscheff polynomials to determine the Fourier coefficients. In this manner an optimum radiation pattern is achieved. To approximate the required current distributions, some form of circular symmetry is indicated for the generator or diving system. The antenna itself obviously possesses circular symmetry. Thus by proper electronic permutation of the drive system a complete 360 degree azimuthal scanned antenna array is possible. It is the purpose of this report to investigate these effects both theoretically and experimentally. (Author)

Descriptors :   *LOOP ANTENNAS, ANTENNA RADIATION PATTERNS, ELECTRONIC SCANNERS

Distribution Statement : APPROVED FOR PUBLIC RELEASE