# Discontinuities in the Electromagnetic Field. IEEE Press Series on Electromagnetic Wave Theory

• ID: 2176691
• Book
• 240 Pages
• John Wiley and Sons Ltd
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A multifaceted approach to understanding, calculating, and managing electromagnetic discontinuities

Presenting new, innovative approaches alongside basic results, this text helps readers better understand, calculate, and manage the discontinuities that occur within the electromagnetic field. Among the electromagnetic discontinuities explored in this volume are:

• Bounded jump discontinuities at the interfaces between two media or on the material sheets that model very thin layers

• Unbounded values at the edges of wedge–type structures

• Unbounded values at the tips of conical structures

The text examines all the key issues related to the bodies that carry the interfaces, edges, or tips, whether these bodies are at rest or in motion with respect to an observer. In addition to its clear explanations, the text offers plenty of step–by–step examples to clarify complex theory and calculations. Moreover, readers are encouraged to fine–tune their skills and knowledge by solving the text′s problem sets.

Three fundamental, classical theories serve as the foundation for this text: distributions, confluence, and the special theory of relativity. The text sets forth the fundamentals of all three of these theories for readers who are not fully familiar with them. Moreover, the author demonstrates how to solve electromagnetic discontinuity problems by seamlessly combining all three theories into a single approach.

With this text as their guide, readers can apply a unique philosophy and approach to the investigation and development of structures that have the potential to enhance the capabilities of electronics, antennas, microwaves, acoustics, medicine, and many more application areas.

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Preface ix

1. Introduction 1

2. Distributions and Derivatives in the Sense of Distribution 7

2.1 Functions and Distributions, 7

2.2 Test Functions. The Space C 0 , 9

2.3 Convergence in D, 14

2.4 Distribution, 16

2.5 Some Simple Operations in D, 21

2.5.1 Multiplication by a Real Number or a Function, 21

2.5.2 Translation and Rescaling, 21

2.5.3 Derivation of a Distribution, 22

2.6 Order of a Distribution, 26

2.7 The Support of a Distribution, 31

2.8 Some Generalizations, 33

2.8.1 Distributions on Multidimensional Spaces, 33

2.8.2 Vector–Valued Distributions, 38

3. Maxwell Equations in the Sense of Distribution 49

3.1 Maxwell Equations Reduced into the Vacuum, 49

3.1.1 Some Simple Examples, 53

3.2 Universal Boundary Conditions and Compatibility Relations, 54

3.2.1 An Example. Discontinuities on a Combined Sheet, 57

3.3 The Concept of Material Sheet, 59

3.4 The Case of Monochromatic Fields, 62

3.4.1 Discontinuities on the Interface Between Two

Simple Media that Are at Rest, 64

4. Boundary Conditions on Material Sheets at Rest 67

4.1 Universal Boundary Conditions and Compatibility Relations for a Fixed Material Sheet, 67

4.2 Some General Results, 69

4.3 Some Particular Cases, 70

4.3.1 Planar Material Sheet Between Two Simple Media, 70

4.3.2 Cylindrically or Spherically Curved Material Sheet Located Between Two Simple Media, 91

4.3.3 Conical Material Sheet Located Between Two Simple Media, 93

5. Discontinuities on a Moving Sheet 109

5.1 Special Theory of Relativity, 110

5.1.1 The Field Created by a Uniformly Moving Point Charge, 112

5.1.2 The Expressions of the Field in a Reference System Attached to the Charged Particle, 114

5.1.3 Lorentz Transformation Formulas, 115

5.1.4 Transformation of the Electromagnetic Field, 118

5.2 Discontinuities on a Uniformly Moving Surface, 120

5.2.1 Transformation of the Universal Boundary Conditions, 123

5.2.2 Transformation of the Compatibility Relations, 126

5.2.3 Some Simple Examples, 126

5.3 Discontinuities on a Nonuniformly Moving Sheet, 138

5.3.1 Boundary Conditions on a Plane that Moves in a Direction Normal to Itself, 139

5.3.2 Boundary Conditions on the Interface of Two Simple Media, 143

6. Edge Singularities on Material Wedges Bounded by Plane Boundaries 149

6.1 Introduction, 149

6.2 Singularities at the Edges of Material Wedges, 153

6.3 The Wedge with Penetrable Boundaries, 154

6.3.1 The H Case, 156

6.3.2 The E Case, 171

6.4 The Wedge with Impenetrable Boundaries, 174

6.5 Examples. Application to Half–Planes, 175

6.6 Edge Conditions for the Induced Surface Currents, 176

7. Tip Singularities at the Apex of a Material Cone 179

7.1 Introduction, 179

7.2 Algebraic Singularities of an H–Type Field, 185

7.2.1 Contribution of the Energy Restriction, 185

7.2.2 Contribution of the Boundary Conditions, 186

7.3 Algebraic Singularities of an E–Type Field, 191

7.4 The Case of Impenetrable Cones, 193

7.5 Confluence and Logarithmic Singularities, 195

7.6 Application to some Widely used Actual Boundary Conditions, 197

7.7 Numerical Solutions of the Transcendental Equations Satisfied by the Minimal Index, 200

7.7.1 The Case of Very Sharp Tip, 200

7.7.2 The Case of Real–Valued Minimal v, 201

7.7.3 A Function–Theoretic Method to Determine Numerically the Minimal v, 203

8. Temporal Discontinuities 209

8.1 Universal Initial Conditions, 209

8.2 Linear Mediums in the Generalized Sense, 211

8.3 An Illustrative Example, 212

References 215

Index 219

IEEE Press Series on Electromagnetic Wave Theory

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