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1 Functional Analysis and Sobolev Spaces ................... 1 1.1 Normed Spaces ......................................... 1 1.2 Bounded Linear Operators . ............................ .. 6 1.3 The Adjoint Operator................................ 13 1.4 The Sobolev Space HP[0, 27r] .. . ........................ 17 1.5 The Sobolev Space HP(OD) .............................. 22 2 Ill-Posed Problem s ....................... ............. . 27 2.1 Regularization Methods . ............................... 28 2.2 Singular Value Decomposition..................... ... .. . 30 2.3 Tikhonov Regularization .............................. .. 36 3 Scattering by an Imperfect Conductor ..................... 45 3.1 Maxwell's Equations .............. ..................... 45 3.2 Bessel Functions. ................ ..................... 47 3.3 The Direct Scattering Problem ......................... . . 51 4 The Inverse Scattering Problem for an Imperfect Conductor .............. ............... . 61 4.1 Far Field Patterns.......................... .......... 62 4.2 Uniqueness Theorems for the Inverse Problem............... 65 4.3 The Linear Sampling Method .......................... . 69 4.4 Determination of the Surface Impedance ................. . 76 4.5 Limited Aperture Data . .............................. . 79 5 Scattering by an Orthotropic Medium ................... . 81 5.1 Maxwell Equations for an Orthotropic Medium............ . 81 5.2 Mathematical Formulation of the Direct Scattering Problem ........................ . 85 5.3 Variational Methods ................. .... ............. 89 5.4 Solution of the Direct Scattering Problem ................ .101 6 The Inverse Scattering Problem for an Orthotropic Medium............................ 105 6.1 Formulation of the Inverse Problem ................... .... 105 6.2 The Interior Transmission Problem .................. .... 108 6.3 Uniqueness ............................................. 117 6.4 The Linear Sampling Method ........................... 120 7 The Factorization M ethod ................... .......... 131 7.1 Preliminary Results ............. . ..................... 132 7.2 Properties of the Far Field Operator ...................... 1412 7.3 The Factorization Method .............................146 7.4 Closing Remarks ...................................151 8 Mixed Boundary Value Problems ......................... 153 8.1 Scattering by a Partially Coated Perfect Conductor ......... 154 8.2 The Inverse Scattering Problem for a Partially Coated Perfect Conductor ................................... 161 8.3 Numerical Examples .................................. 166 8.4 Scattering by a Partially Coated Dielectric................. 171 8.5 The Inverse Scattering Problem for a Partially Coated Dielectric ........................ . 180 8.6 Numerical Examples .................................. 188 8.7 Scattering by Cracks .................................. 192 8.8 The Inverse Scattering Problem for Cracks ................. 201 8.9 Numerical Examples ..................................209 9 A Glimpse at Maxwell's Equations ........................ 213 References ...................................................219 Index ............ ............................. ...............225