Application of an Integral Equation Method to Scattering by Dielectric Cylindrical Shells Having Finite Length.

摘要

An integral equation for the electromagnetic field within a dielectric body is given. The equation is set up for numerical solution for the case of thin-wall cylindrical shells having finite length. The solution of the integral equation utilizes a truncated double Fourier expansion of the field in the shell. The integral equation is then enforced at enough points within the shell wall to obtain a sufficient system of linear equations in the unknown expansion coefficients of the field. Numerical integration over the shell volume is used to obtain the coefficients in the system of linear equations. The system of equations is solved numerically for the expansion coefficients of the field in the shell. Calculation of the backscattered fields and the backscattering cross section are then performed. A comparison of the calculated and measured backscattering cross section is made for rings with arbitrary plane wave incidence and for tubes with axial plane wave incidence. The agreement is excellent in all cases considered. The numerical methods, experimental arrangement, computer programs and suitable extension of this work are discussed. (Author)