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Comprehensive Resource for Understanding Electromagnetic Shielding Concepts and Recent Developments in the Field
This book describes the fundamental, theoretical, and practical aspects to approach electromagnetic shielding with a problem-solving mind, either at a design stage or in the context of an issue-fixing analysis of an existing configuration. It examines the main shielding mechanisms and how to analyze any shielding configuration, taking into account all the involved aspects. A detailed discussion on the possible choices of parameters suitable to ascertain the performance of a given shielding structure is also presented by considering either a continuous wave EM field source or a transient one.
To aid in reader comprehension, both a theoretical and a practical engineering point of view are presented with several examples and applications included at the end of main chapters. Sample topics discussed in the book include:
* Concepts in transient shielding including performance parameters and canonical configurations
* Time domain performance of shielding structures, thin shields, and overall performance of shielding enclosures (cavities)
* How to install adequate barriers around the most sensitive components/systems to reduce or eliminate interference
* Details on solving core fundamental issues for electronic and telecommunications systems via electromagnetic shielding
For industrial researchers, telecommunications/electrical engineers, and academics studying the design of EM shielding structures, this book serves as an important resource for understanding both the logistics and practical applications of electromagnetic shielding. It also includes all recent developments in the field to help professionals stay ahead of the curve in their respective disciplines.
List of contents
About the Authors ix
Preface xiii
1 Electromagnetics Behind Shielding 1
1.1 Definitions 1
1.2 Notation, Symbology, and Acronyms 3
1.3 Macroscopic Electromagnetism and Maxwell's Equations 4
1.4 Constitutive Relations 6
1.5 Discontinuities and Singularities 11
1.6 Initial Conditions, Boundary Conditions, and Causality 12
1.7 Poynting's Theorem and Energy Considerations 13
1.8 Fundamental Theorems 16
1.9 Wave Equations, Helmholtz's Equations, Potentials, and Green's Functions 23
1.10 Basic Shielding Mechanisms 28
1.11 Source Inside or Outside the Shielding Structure and Reciprocity 29
2 Shielding Materials 33
2.1 Standard Metallic and Ferromagnetic Materials 33
2.2 Ferrimagnetic Materials 39
2.3 Ferroelectric Materials 41
2.4 Thin Films and Conductive Coatings 43
2.5 Other Materials Suitable for EM Shielding Applications 45
2.6 Special Materials 46
3 Figures of Merit for Shielding Configurations 61
3.1 (Local) Shielding Effectiveness 61
3.2 The Global Point of View 64
3.3 Other Proposals of Figures of Merit 65
3.4 Energy-Based, Content-Oriented Definition 69
3.5 Performance of Shielded Cables 69
4 Shielding Effectiveness: Plane Waves 73
4.1 Electromagnetic PlaneWaves: Definitions and Properties 73
4.2 Uniform PlaneWaves Incident on a Planar Shield 75
4.3 PlaneWaves Normally Incident on Cylindrical Shielding Surfaces 86
4.4 PlaneWaves Against Spherical Shields 93
4.5 Extension of the TL Analogy to Near-Field Sources 94
5 Shielding Effectiveness: Near-Field Sources 109
5.1 Spectral-Domain Approach 109
5.2 LF Magnetic Shielding of Metal Plates: Parallel Loop 122
5.3 LF Magnetic Shielding of Metal Plates: Perpendicular Loop 130
5.4 LF Magnetic Shielding of Metal Plates: Parallel Current Line 134
6 Transient Shielding 141
6.1 Performance Parameters: Definitions and Properties 141
6.2 Transient Sources: PlaneWaves and Dipoles 145
6.3 Numerical Solutions via Inverse-Fourier Transform 149
6.4 Analytical Solutions in Canonical Configurations 150
7 Numerical Methods for Shielding Analyses 169
7.1 Finite-Element Method 171
7.2 Method of Moments 187
7.3 Finite-Difference Time-Domain Method 208
7.4 Finite Integration Technique 221
7.5 Transmission-Line Matrix Method 226
7.6 Partial Element Equivalent Circuit Method 230
7.7 Test Case for Comparing Numerical Methods 239
8 Apertures in Planar Metal Screens 257
8.1 Historical Background 258
8.2 Statement of the Problem 259
8.3 Low-Frequency Analysis: Transmission Through Small Apertures 260
8.4 The Small Circular Aperture 261
8.5 Small Noncircular Apertures 269
8.6 Finite Number of Small Apertures 269
8.7 Apertures of Arbitrary Shape: Integral-Equation Formulation 272
8.8 Rules of Thumb 275
9 Enclosures 283
9.1 Modal Expansion of Electromagnetic Fields Inside a Metallic Enclosure 284
9.2 Oscillations Inside an Ideal Source-Free Enclosure 287
9.3 The Enclosure Dyadic Green Function 288
9.4 Excitation of a Metallic Enclosure 291
9.5 Damped Oscillations Inside Enclosures with LossyWalls and Quality Factor 292
9.6 Apertures in Perfectly Conducting Enclosures 294
9.7 Small Loading Effects 301
9.8 The Rectangular Enclosure 302
About the author
Salvatore Celozzi, PhD, is a Professor at the University of Roma "La Sapienza", Italy. He has published more than one hundred and fifty papers in refereed journals or in proceedings of international conferences, mainly in the fields of electromagnetic shielding, transmission lines, and printed circuits.
Rodolfo Araneo, PhD, is a Professor at the University of Roma "La Sapienza", Italy. His fields of expertise are electromagnetic shielding, numerical methods, power systems, and renewable energies.
Paolo Burghignoli, PhD, is an Associate Professor at the University of Roma "La Sapienza", Italy. His research topics are in the areas of antennas, advanced electromagnetic materials, and electromagnetic shielding.
Giampiero Lovat, PhD, is an Assistant Professor at the University of Rome "La Sapienza", Italy. His research encompasses theoretical and numerical studies on electromagnetic shielding, periodic structures, electrodynamics of graphene, leakage phenomena in planar structure, and transient electromagnetics.
