Shahid Ahmed

Electromagnetic Pulse Simulations Using Finite-Difference Time-Domain Method (eBook, ePUB)

• Format: ePub

Produktbeschreibung

Electromagnetic Pulse Simulations Using Finite-Difference Time-Domain Method Discover the utility of the FDTD approach to solving electromagnetic problems with this powerful new resource Electromagnetic Pulse Simulations Using Finite-Difference Time-Domain Method delivers a comprehensive overview of the generation and propagation of ultra-wideband electromagnetic pulses. The book provides a broad cross-section of studies of electromagnetic waves and their propagation in free space, dielectric media, complex media, and within guiding structures, like waveguide lines, transmission lines, and antennae. The distinguished author offers readers a fresh new approach for analyzing electromagnetic modes for pulsed electromagnetic systems designed to improve the reader's understanding of the electromagnetic modes responsible for radiating far-fields. The book also provides a wide variety of computer programs, data analysis techniques, and visualization tools with state-of-the-art packages in MATLAB¯® and Octave. Following an introduction and clarification of basic electromagnetics and the frequency and time domain approach, the book delivers explanations of different numerical methods frequently used in computational electromagnetics and the necessity for the time domain treatment. In addition to a discussion of the Finite-difference Time-domain (FDTD) approach, readers will also enjoy: * A thorough introduction to electromagnetic pulses (EMPs) and basic electromagnetics, including common applications of electromagnetics and EMP coupling and its effects * An exploration of time and frequency domain analysis in electromagnetics, including Maxwell's equations and their practical implications * A discussion of electromagnetic waves and propagation, including waves in free space, dielectric mediums, complex mediums, and guiding structures * A treatment of computational electromagnetics, including an explanation of why we need modeling and simulations Perfect for undergraduate and graduate students taking courses in physics and electrical and electronic engineering, Electromagnetic Pulse Simulations Using Finite-Difference Time-Domain Method will also earn a place in the libraries of scientists and engineers working in electromagnetic research, RF and microwave design, and electromagnetic interference.

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Produktdetails

• Verlag: Wiley-Scrivener
• Seitenzahl: 352
• Erscheinungstermin: 20. April 2021
• Englisch
• ISBN-13: 9781119526223
• Artikelnr.: 61663927

Autorenporträt

Shahid Ahmed, PhD, is a Senior Application Engineer at ANSYS, Inc. He has taught undergrad and graduate-level courses in physics, electrical, and electronics engineering. His research included experiments as well as computational modeling and simulations. He has published forty scholarly papers on various aspects of electromagnetics in peer-reviewed journals and conferences.

Inhaltsangabe

Acknowledgments xiii

Preface xv

1 Electromagnetic Pulse 1

1.1 Sources of EMP 1

1.2 EMP Coupling and its Effects 3

1.3 EMP Simulators 3

1.4 Review of Earlier Work 5

1.5 Overview of this Book 10

1.6 Summary 12

2 Time and Frequency Domain Analysis 13

2.1 Introduction 13

2.2 Nuclear Electromagnetic Pulse 14

2.2.1 Differences of Two Exponentials Times in a Unit Step Function 14

2.2.1.1 Time-Domain 15

2.2.1.2 Frequency-Domain 15

2.2.2 Reciprocal of the Sum of Two Exponentials 17

2.2.2.1 Time-Domain Characteristics 18

2.2.2.2 Frequency-Domain 19

2.3 Summary 22

3 Simulations Using FDTD Method 23

3.1 Introduction 23

3.2 Need for FDTD Analysis of an EMP Simulator 24

3.2.1 Choice of Method for Self-consistent Analysis 25

3.3 Maxwell's Equations and the Yee Algorithm 25

3.4 FDTD Implementation 27

3.5 Numerical Issues 29

3.6 Summary 31

4 Electromagnetic Pulse in Free Space and Material Media 32

4.1 Introduction 32

4.2 Input Waveform 32

4.2.1 MATLAB(r) Script for Visualization: Listing #1 33

4.2.2 Execution of MATLAB/OCTAVE Code 35

4.3 One-dimension Approach 36

4.3.1 Free Space 36

4.3.1.1 MATLAB Code Listing #1: EM Wave Propagation in Free-space 38

4.3.2 Data Recording and Visualization 41

4.3.2.1 MATLAB Script for Visualization: Listing #2 41

4.3.3 Dielectric Medium 43

4.3.3.1 Lossless Dielectric Medium 44

4.3.3.2 MATLAB Code Listing #2: EM Wave in Air and Lossless-dielectric Medium 45

4.3.3.3 Lossy Dielectric Medium 49

4.3.3.4 MATLAB Code Listing #3: EM Wave in Air and Lossy-dielectric Medium 51

4.3.3.5 MATLAB Code Listing #4: Analytical Approach for Wave in Lossy Medium 55

4.3.4 Perfect Electric Conductor (PEC) 56

4.3.4.1 MATLAB Code Listing #5: EM Wave in Air-PEC Half-space 57

4.4 Summary 61

Exercises 61

5 Simulation of Capacitor Bank 63

5.1 Introduction 63

5.2 Details of Model 64

5.2.1 Description of Geometry 64

5.2.2 Method of Charging 65

5.2.3 Method for Calculating FDTD Charge and Capacitance 66

5.2.4 FDTD Model of Closing Switch 68

5.2.5 Discharging a Charged Capacitor 69

5.3 Results and Discussion 70

5.3.1 Charge Deposition on Plates 70

5.3.2 Stabilization of Charge Density Distribution 71

5.3.3 Determination of Characteristic Discharge Time 72

5.4 Cross-check of FDTD Results Using Method-of-Moments 73

5.4.1 Check of Capacitance 74

5.4.2 Edge Effects on Charge Density Distribution 75

5.4.3 Check of Charge Density Distribution 76

5.5 Effect of Boundary Condition 78

5.6 Summary 80

Exercises 81

6 Bounded Wave Simulator for Electromagnetic Pulses 83

6.1 Introduction 83

6.1.1 Organization of This Chapter 83

6.2 Geometry and Computational Model 85

6.2.1 Idealizations 85

6.2.2 Geometry 86

6.2.3 FDTD Model 87

6.3 Validation of TEM Structure Geometry 88

6.3.1 Analytical Check 88

6.3.2 Numerical Check 88

6.4 FDTD Model of Closing Switch 91

6.5 Choice of Distance to Domain Boundary 93

6.6 Electric Field within TEM Structure 93

6.6.1 Effect of Switch Closure Time 94

6.6.2 Pulse Fidelity 95

6.7 Flow of Current