Accession Number : AD0427175


Title :   RADIATION FROM A DIRECTIVE ANTENNA EMBEDDED IN AN ANISOTROPIC HALF SPACE,


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


Personal Author(s) : Felsen,L B ; Rulf,B


Report Date : 09 Aug 1963


Pagination or Media Count : 30


Abstract : Research was directed to the quantitative aspects and physical mechanism of radiation from sources in bounded anisotropic media. An asymptotic evaluation of the rigorous solution has led to far field contributions which have been identified as incident, reflected and refracted waves, and also as lateral waves. It has been shown how the reflected, refracted, and lateral wave fields can be constructed from a knowledge of the radiation field in an infinite medium, thereby providing quantitative support for certain raytracing procedures when the source is located inside, rather than exterior to, the anisotropic region. In this quasi-optical interpretation, the refractive index surfaces descriptive of plane wave propagation in the medium play a crucial role since they provide information on the directions of: (1) the ray (energy flow) and wave normal (phase propagation) vectors, thereby facilitating the implementation of the radiation condition (2) the incident, reflected, and refracted rays; and (3) the critically refracted rays required to launch the lateral waves. A physical basis has thereby been provided for the quantitative understanding of radiation phenomena which, though derived for uniaxially anisotropic media, may be expected to occur also in other types of anisotropy. (Author)


Descriptors :   *ELECTROMAGNETIC RADIATION , *ELECTROMAGNETIC WAVE REFLECTIONS , PROPAGATION , ANISOTROPY , ANTENNAS , ANTENNA LOBES , REFRACTIVE INDEX , ANTENNA RADIATION PATTERNS , EQUATIONS , PLASMAS(PHYSICS)


Distribution Statement : APPROVED FOR PUBLIC RELEASE