Accession Number : AD0014953


Title :   ELECTROMAGNETIC SCATTERING FROM TWO PARALLEL CONDUCTING CIRCULAR CYLINDERS


Corporate Author : HARVARD UNIV CAMBRIDGE MA CRUFT LAB


Personal Author(s) : Row, R V


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/014953.pdf


Report Date : 01 May 1953


Pagination or Media Count : 89


Abstract : The problem of the scattering of an incident cylindrical electromagnetic wave by an arbitrary array of perfectly conducting circular cylinders is solved for the case of the electric vector parallel to the axes of the cylinders. The total field is calculated by the use of a Green's theorem. The application of the boundary conditions results in a set of integral equations for the current on each cylinder; arbitrary excitations and coupling between all the elements are taken into account. The currents are expanded in a complex Fourier series; this transforms the integral equations into an infinite set of linear algebraic equations in the unknown Fourier coefficients. The theory is specialized to the case of 2 identical cylinders. In addition, neglect of the coupling between different current modes yields a simple formula for the scattered field in which the effect of coupling is apparent. For 2 cylinders equidistant and far from the source, the scattered field is computed from these approximations for cylinders as large as a wave length in diameter and for spacings of 1 to 4 lambda w between the centers. The approximations were confirmed by measurements at 3.185 cm w in a parallel plate region. Both theory and experiment indicate significant departures from the predictions of the independent scattering hypothesis.


Descriptors :   *CYLINDRICAL BODIES , *ELECTROMAGNETIC SCATTERING , BOUNDARIES , COEFFICIENTS , YIELD , HYPOTHESES , INFINITE SERIES , PARALLEL ORIENTATION , GREENS FUNCTIONS , INTEGRAL EQUATIONS , SET THEORY , CIRCULAR , LINEAR ALGEBRAIC EQUATIONS , FOURIER SERIES , FREQUENCY , FORMULATIONS


Subject Categories : Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE