Accession Number : AD0657799

Title :   MODIFICATION OF BACKSCATTERING OF A LOOP BY IMPEDANCE LOADING,

Corporate Author : MICHIGAN STATE UNIV EAST LANSING DIV OF ENGINEERING RESEARCH

Personal Author(s) : Lin,J. L. ; Chen,K. M.

Report Date : 20 MAY 1967

Pagination or Media Count : 201

Abstract : In the report the modification of the backscattering of a loop by the impedance loading method is investigated theoretically and experimentally. First of all, the resonant phenomena of a loop when illuminated by an electromagnetic wave is studied. Next, the backscattering of a circular conducting loop is considered and the impedance loading method is applied to minimize its backscatter. Finally, the minimization of the backscattering of a rectangular loop is investigated. In the theoretical analysis, a new method based on a differential equation for the loop current is developed for the case of a circular loop. For the case of a rectangular loop an existing method is applied with slight modification. Throughout the entire analysis, the principle of superposition is applied to simplify the problem of an illuminated loaded loop to the combination of an illuminated solid loop and a radiating loop. The major objectives of the theoretical analysis are to determine the induced current on a loaded loop, the scattered field from a loaded loop and the optimum impedance which, when loaded on the loop, makes the backscatter of the loop vanish. Extensive experimental study was also conducted. The resonant phenomena of a solid loop was investigated carefully. The impedance loading technique was then applied to the circular and the rectangular loops to minimize their backscatters. In the course of this experiment, the backscatter of a loop was successfully minimized to the noise level. (Author)

Descriptors :   (*RADAR CROSS SECTIONS, BACKSCATTERING), RINGS, DIFFERENTIAL EQUATIONS, RECTANGULAR BODIES, METALS, ELECTRICAL IMPEDANCE, THEORY, ELECTROMAGNETIC RADIATION, ILLUMINATION

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE