## Applications of the Conjugate Gradient FFT Method in Scattering and Radiation Including Simulations with Impedance Boundary Conditionsconditions of up to the third order are employed and shown to be compatible with the basic CGFFT formulation, allowing an efficient simulation of large coated structures and filled cavity-backed apertures by further reducing the memory demand. For the purpose of validation of these simulations, a general full-wave analysis of two- and three-dimensional rectangular grooves and cavities is presented which will also serve as reference for future work. |

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### Contents

THE CONJUGATE GRADIENT FFT METHOD | 14 |

RADIATION AND SCATTERING FROM PLATES | 72 |

GENERALIZED IMPEDANCE BOUNDARY CONDITIONS | 116 |

4 other sections not shown

### Common terms and phrases

1A conducting plate 1A x 1A 2A conducting 2A x 2A admittance elements Angle of Incidence Antennas Propagat application approximate basis functions behavior bistatic CGDFT CGFFT algorithm CGFFT method CGFFT solution CGFT Comparison component computed conjugate gradient method constant basis functions convolution theorem corresponding current density current distribution cylindrical denotes derived dielectric dimensional discrete Fourier transform E-Pol E-polarization electric field employed equivalent magnetic current evaluated excitation expansion functions FFT pad finite free space Geometry given Green's function ground plane Hertzian dipole IEEE Trans impedance boundary condition impedance insert integral equation iterative J. L. Volakis matrix method of moments mode obtained optimized order g pad of order perfectly conducting piecewise constant basis plane wave problem processors quasi-static radar cross section radiation RCS patterns rectangular groove resistive taper sampling density scalar scattered field SIBC simulation solved speedup T. B. A. Senior tangential three-dimensional two-dimensional vector Vector-Concurrent