Application of Hierarchical Two-Level Spectral Preconditioning Method for Electromagnetic Scattering from the Rough Surface

<table>Convergence history of the hierarchical two-level spectral preconditioned GMRES, FGMRES and GMRES algorithms for 2-order hierarchical Legendre basis functions for the orthogonal plane scatterer.</table>

International Journal of Antennas and Propagation

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Figure 3

Figure 3: Application of Hierarchical Two-Level Spectral Preconditioning Method for Electromagnetic Scattering from the Rough Surface 