Title :
A Calderón-Preconditioned Single Source Combined Field Integral Equation for Analyzing Scattering From Homogeneous Penetrable Objects
Author :
Valdés, Felipe ; Andriulli, Francesco P. ; Bagci, Hakan ; Michielssen, Eric
Author_Institution :
Electr. Eng. & Comput. Sci. Dept., Univ. of Michigan, Ann Arbor, MI, USA
fDate :
6/1/2011 12:00:00 AM
Abstract :
A new regularized single source equation for analyzing scattering from homogeneous penetrable objects is presented. The proposed equation is a linear combination of a Calderón-preconditioned single source electric field integral equation and a single source magnetic field integral equation. The equation is immune to low-frequency and dense-mesh breakdown, and free from spurious resonances. Unlike dual source formulations, this equation involves operator products that cannot be discretized using standard procedures for discretizing standalone electric, magnetic, and combined field operators. Instead, the single source equation proposed here is discretized using a recently developed technique that achieves a well-conditioned mapping from div- to curl-conforming function spaces, thereby fully respecting the space mapping properties of the operators involved, and guaranteeing accuracy and stability. Numerical results show that the proposed equation and discretization technique give rise to rapidly convergent solutions. They also validate the equation´s resonant free character.
Keywords :
computational electromagnetics; convergence of numerical methods; electromagnetic wave scattering; integral equations; Calderon preconditioned single source combined field; curl-conforming function space; discretization technique; div-conforming function space; homogeneous penetrable objects; resonant free character; scattering analysis; single source electric field integral equation; single source equation; single source magnetic field integral equation; space mapping; Eigenvalues and eigenfunctions; Electric breakdown; Equations; Integral equations; Magnetic fields; Resonant frequency; Scattering; Combined field integral equation (CFIE); numerical methods; preconditioning; regularization; single source integral equations;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2011.2143671