Accession Number : AD0685197

Title :   THE SCATTERED-FIELD RESPONSE OF A LINEAR ARRAY TO A STEP-FUNCTION ILLUMINATION.

Descriptive Note : Final rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Sledge,Oliver D.

Report Date : 13 FEB 1969

Pagination or Media Count : 34

Abstract : A limited investigation is made of the scattered-field response of a linear array of center-loaded cylindrical elements illuminated by a plane electromagnetic wave with a step function of time variation. The theoretical approach utilizes Fourier's theorem to express the transient response as a sum of the steady-state responses to the individual sine-wave components of the step-function illumination. The number of array elements and their spacing can be determined simply from the time variation of the backscattered field, provided the angle of incidence of the illumination is known and adequately large to separate the component transient waves. In the case of an N-element array, it is found that the transient field scattered in any arbitrary direction in the H plane can be represented as a summation of N appropriately time-delayed components, each with the same time variation as the field scattered in the reflected direction but with an amplitude reduced by a factor of 1/N. (Author)

Descriptors :   (*ANTENNA ARRAYS, TRANSIENTS), LINEAR SYSTEMS, SCATTERING, ELECTROMAGNETIC FIELDS, NUMERICAL ANALYSIS

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE