Finite element analysis of electromagnetic scattering from inhomogeneous cylinders at oblique incidence
Abstract
The method of weighted residuals is used for the derivation of a convenient weak statement that is utilized for a finiteelement solution of the boundary value problem for the timeharmonic electromagnetic scattering from linear, isotropic, composite cylinders at oblique incidence. Assuming that the cylinder axis is parallel to the z axis of a Cartesian coordinate system, the excitation can be either a plane wave of arbitrary polarization incident at an angle other than perpendicular to the z axis or any travelingwave field with z dependence. The cylinder is axially uniform, whereas its cross section, in general, may be inhomogeneous, lossy, and of arbitrary shape. The weightedresidual statement of the problem involves the z components of the electric and magnetic field and is such that the continuity of the tangential electric and magnetic fields at media interfaces is directly enforced. The finiteelement solution is carried out using the bymoment method. Numerical results for echo widths and field distributions within cylinders of various shapes and compositions are presented. Comparisons of some of the results with those obtained from exact eigenfunction expansion and integral equation solutions demonstrate the validity of the method and the associated computer program.
 Publication:

IEEE Transactions on Antennas and Propagation
 Pub Date:
 May 1991
 DOI:
 10.1109/8.81493
 Bibcode:
 1991ITAP...39..645C
 Keywords:

 Antenna Radiation Patterns;
 Composite Materials;
 Cylindrical Antennas;
 Electromagnetic Scattering;
 Finite Element Method;
 Plane Waves;
 Boundary Value Problems;
 Incident Radiation;
 Method Of Moments;
 Obliqueness;
 Traveling Waves;
 Communications and Radar