Efficient Solution for Electromagnetic Scattering Using the Dual-Surface Magnetic-Field Integral Equation for Bodies of Revolution.
Abstract
The dual-surface magnetic-field integral equation (DMFIE) eliminates the spurious resonances from the magnetic-field integral equation (MFIE) for plane-wave scattering from bodies of revolution. The numerical predictions of scattering from a right circular cylinder were excellent using as little as seven segments per wavelength and simple pulse-basis and impulse-testing functions. The total solution time for electrically large bodies is reduced dramatically using the FFT and conjugate gradient (CG) method. The solution times using Gaussian elimination were proportional to (d/lambda)3 for axial incidence for a scatterer of equal width and length, d, and proportional to (d/lambda)4 at broadside incidence. For broadside incidence, matrix-fill time was reduced using the FFT to a (d/lambda)3log2(d/lambda) functional dependence, and CG reduced the solution time to (d/lambda)3. Therefore, the total CPU time for electrically large bodies of revolution is proportional to (d/lambda)3 for axial incidence and (d/lambda)3log2(d/lambda) for broadside incidence. The MFIE and the original DMFIE do not correctly produce the dominant current for scatterers with narrow tips, and these equations yielded incorrect results for bodies with these features. In coding the exact solution to scattering from the tip of an infinite cone into the computer program, the DMFIE was shown to calculate scattering from bodies with narrow tips accurately.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1995
- Accession Number
- ADA309065
Entities
People
- James L. Schmitz
Organizations
- Rome Laboratory