Preface to the original book

Chapter 1 electromagnetic theory shielding 1

1. 1 definition 1

1.2 symbols, expressions and abbreviations 2

1.3 Fundamentals of electromagnetism 3

1.3. 1 Macroelectromagnetics and Maxwell Equation 3

1.3.2 constitutive relation 5

1.3.3 Breakpoints and Singularities 8

1.3.4 initial conditions and boundary conditions 9

1.3.5 Poynting Theorem and Energy Consideration 10

1.3.6 Fundamental Theorem 1 1

1.3.7 Wave equation, Helmholtz equation, electromagnetic potential and Green's function 13

1.4 Basic shielding mechanism 14

1.5 Internal and external sources of shielding structure and their relationship 15

Reference 16

Chapter II Shielding Materials 17

2. 1 standard metals and ferromagnetic materials 17

2.2 ferromagnetic material 22

2.3 Ferroelectric Materials 23

2.4 Film and Conductive Coating 25

2.5 Other materials suitable for electromagnetic shielding applications 26

Structural material 26

2.5.2 conductive polymer material 26

2.5.3 Conductive glass and transparent materials 27

2.5.4 Conductive (ferromagnetic and ferrimagnetic) paper 27

2.6 Special materials 27

2.6. 1 Specific Materials and Chiral Absorbing Materials 27

Composite material 29

Nanomaterials 30

High temperature superconductor 30

Reference 3 1

Chapter 3 The quality factor of shielding configuration is 35.

3. 1 (local) shielding efficiency 35

3.2 Global perspective 37

3.3 Suggestions for other quality factors 38

3.4 Statistical Methods 42

3.5 Energy-based, Content-oriented Definitions 43

3.6 Shielded cable 44

Reference 44

Chapter 4 Shielding Efficiency of Layered Media 46

4. 1 plane electromagnetic wave: definition and properties 46

4.2 Uniform plane wave incident on the plane shield 48

4.2. 1 transmission line method 48

4.2.2 Single Plane Shield 50

4.2.3 Multiple shielding (laminated shielding) 54

4.3 Plane Wave 56 perpendicular to the cylindrical shielding surface

4.4 Plane waves are incident on the spherical shield 6 1

4.5 Extension of TL simulation method to the limitation of near-field source 62

Reference 70

Chapter 5 Numerical Methods in Shielding Analysis 72

5. 1 finite element method 73

5.2 Method of Moments 8 1

5.3 Finite Difference Time Domain Method 90

5.4 Limited integration technology 98

5.5 Transmission Line Matrix Method 102

5.6 Equivalent Circuit Method of Local Components 104

5.7 Case study: Scattering of a conductor shield with a rectangular slot 1 10.

Reference 1 13

Chapter VI Aperture of Plane Metal Screen 120

6. 1 historical background 120

6.2 problem statement 12 1

6.3 Low Frequency Analysis: Propagation through Small Aperture 122

6.4 situation of small round hole 123

6.5 Non-small round hole 127

6.6 Finite small circular hole 127

6.7 Strict analysis of holes with arbitrary shapes: establishment of integral equation 129

6.8 Rule of thumb 13 1

Reference 133

Chapter VII Shell 135

7. Modal expansion of magnetic field in1metal cavity 135

7.2 Resonance in an Ideal Passive Cavity 138

7.3 Dyadic Green's Function of Cavity 139

7.4 exciting internal magnetic field of metal +04 1

7.5 damping oscillation and quality factor of cavity wall at loss 142

7.6 Hole in Fully Conductive Cavity 144

7.6. 1 small aperture approximation problem 144

7.6.2 Establish the integral equation 146.

7.6.3 cavity resonance 148

7.7 Small load effect 150

7.8 Rectangular Cavity 150

7.8. 1 symmetry consideration 153

7.9 shielding effect of rectangular cavity with circular hole 154

7.9. 1 external source: plane wave activation 154.

7.9.2 Internal sources: electric dipole excitation and secondary dipole excitation 158.

Reference 163

Chapter 8 Cable Shielding 165

8. 1 Transmission impedance and aperture effect of tubular shielded cable 166

8.2 Relationship between transmission impedance and aperture effect 170

8.3 actual cables and wiring 17 1

Reference 172

Chapter 9 Shielding Components and Installation Guide 174

9. 1 shield washer 174

9.2 Shielding window 176

9.3 electromagnetic absorber 178

9.4 Shielded connector 179

9.5 Ventilation System 179

9.6 Fuses, switches and other similar components 179

Reference 180

Chapter 10 Frequency Selection Surface 18 1

10. 1 periodic structure analysis 182

10. 1. 1 floquet theorem and space harmony 182.

Plane wave incident on 10. 1.2 one-dimensional periodic structure 183

10. 1.3 plane wave incident on two-dimensional periodic structure 184

10.2 Qualcomm and low-pass frequency selection plane 185

10.3 band-pass and band-stop frequency selection plane 189

10.3. 1 central connection unit or n-pole unit 189

10.3.2 ring unit 190

10.3.3 internal entity unit 190

10.3.4 combination unit and fractal unit 19 1

10.4 degrees of freedom in frequency selection plane design 19 1

10.5 reconfigurable and active frequency selection plane 192

10.6 frequency selective plane and circuit analog absorber 193

Model and design of 10.7 frequency selection plan 194

Reference 196

Chapter 1 1 Shielding Design Guide 200

1 1. 1 Establish shielding requirements 200

1 1.2 estimation of the type and number of functional breakpoints 202

1 1.3 estimation of space constraints and non-electromagnetic characteristics of shielding materials 202

1 1.4 shielding performance evaluation 203

Reference 204

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Chapter 12 Unconventional shielding method 205

Appendix a electrostatic shielding 2 19

Appendix b magnetic field shield 234

Appendix c standards and measurement methods 264

Appendix d English abbreviation 296

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