
Accession Number : AD0700818
Title : ANALYSIS OF APERTURE ANTENNAS IN INHOMOGENEOUS MEDIA.
Descriptive Note : Technical rept.,
Corporate Author : CALIFORNIA INST OF TECH PASADENA ANTENNA LAB
Personal Author(s) : Damlamayan,Dikran
Report Date : NOV 1969
Pagination or Media Count : 93
Abstract : The object of this report is to calculate the admittance and the radiation pattern of aperture antennas fed by waveguides of arbitrary crosssection and radiating into dielectric slabs, whose constitutive parameters may be functions of position along the direction normal to the slab faces. For a given aperture field distribution the antenna aperture admittance and the radiation field are expressed here, for the first time, in terms of two auxiliary quantities directly related to the plane wave reflection and transmission coefficients of the dielectric slab. These quantities are the input admittance of the dielectric slab and the ratio of the total electric field amplitude transmitted at one end of the slab to the transverse field at the other, both calculated for plane waves as a function of incident propagation direction. This approach introduces a great simplification in the solution of the problem, particularly in the case of an antenna radiating into an inhomogeneous dielectric slab. A simple and powerful method has been devised for the computation of the input admittance of an inhomogeneous dielectric slab as well as for electric field ratio. In this case the impracticability of obtaining analytical results has necessitated the use of numerical techniques. Applications of theory are discussed. (Author)
Descriptors : (*ANTENNAS, *PLASMA SHEATHS), ANTENNA RADIATION PATTERNS, DIELECTRICS, ADMITTANCE, WAVEGUIDES
Subject Categories : Electrical and Electronic Equipment
Plasma Physics and Magnetohydrodynamics
Distribution Statement : APPROVED FOR PUBLIC RELEASE