Scattering from periodic surfaces with sinusoidal height profile. A theoretical approach. Part 2: Numerical evaluation
Abstract
A computer program was written. Numerical evaluations were performed. Program outputs include the current distribution in the metal surface, the complex amplitudes of the plane wave spectrum (space harmonics representation) of the scatter field and an accuracy check based on conservation of power. This data was computed for both TE-and TM-polarization, where TE and TM is understood with respect to the direction of the surface grooves. The study was performed in support of work on a practical problem, the polarization question of microwave landing systems. One of the aspects of this problem concerns scattering by large periodic metal surfaces, such as hangar doors, and the question whether the specular reflection coefficient of such surfaces can be significantly reduced by appropriate choice of polarization. The numerical results confirm experimental evidence that horizontal polarization generally leads to substantially less specular reflection than vertical polarization, in particular in the interesting range of large angles of incidence (near grazing).
- Publication:
-
Final Report
- Pub Date:
- June 1979
- Bibcode:
- 1979army.reptQ....W
- Keywords:
-
- Computer Programs;
- Electromagnetic Scattering;
- Metal Surfaces;
- Numerical Analysis;
- Current Distribution;
- Microwave Landing Systems;
- Physical Optics;
- Polarization (Waves);
- Communications and Radar