Accession Number : AD0258773

Title :   RADIATION FROM A POINT SOURCE IN AN ANISOTROPIC MEDIUM

Descriptive Note : Doctoral thesis

Corporate Author : POLYTECHNIC INST OF BROOKLYN N Y MICROWAVE RESEARCH INST

Personal Author(s) : ARBEL,E.

Report Date : 02 NOV 1960

Pagination or Media Count : 230

Abstract : A procedure is presented for the derivation of formal solutions to the problem of radiation from finite sources in the presence of gyrotropic regions. The boundary surfaces between adjacent gyrotropic regions constitute a set of parallel planes. The gyrotropic axis is perpendicular to the boundary planes. The above procedure isAPPLIED TO THE PROBLEMS OF RADIATION FROM A CURRENT ELEMENT IN AN INFINITE AND A SEMI-INFINITE PLASMA REGION. In both cases, the current element is oriented along the direction of the dc magnetic field. Asymptotic expressions for the far field are derived by application of the saddle point method. In the case of an infinite plasma region with an infinite dc magnetic field, explicit expressions are derived which are valid everywhere in space. In the case of an infinite plasma region, the radiation field due to a point source consists of several ray contributions. At the vicinity of a given observation point, each ray contribution behaves like a plane wave whose power flow is directed along the straight line from the point source to the observation point. (Author)

Descriptors :   *ELECTROMAGNETIC RADIATION, *MAGNETOHYDRODYNAMICS, *PLASMAS(PHYSICS), *PROPAGATION, CALCULUS OF VARIATIONS, DIFFERENTIAL EQUATIONS, MATHEMATICAL ANALYSIS, NUMERICAL METHODS AND PROCEDURES, OPTICS, VECTOR ANALYSIS

Distribution Statement : APPROVED FOR PUBLIC RELEASE