Electromagnetic Time Reversal

✍ Scribed by Paolone, Mario; Rachidi, Farhad; Rubinstein, Marcos

• Publisher: John Wiley & Sons, Incorporated
• Year: 2017
• Tongue: English
• Leaves: 301
• Category: Library

✦ Table of Contents

Content: Electromagnetic Time Reversal
Contents
List of Contributors
Preface
About the Companion Website
1 Time Reversal: A Different Perspective
1.1 Introduction
1.2 What is Time?
1.3 Time Reversal or Going Back in Time
1.3.1 Approach 1: Recording of the State of the System Throughout Its Evolution
1.3.2 Approach 2: Use of Expressions that Describe the Evolution of the System as a Function of Time
1.3.3 Approach 3: System Regressing Through Its Own Natural Defining Equations
1.3.4 Time Reversal in the Strict Sense and in the Soft Sense
1.3.5 Schrödinger Equation
1.3.6 Maxwells Equations. 1.3.7 Time-Reversal Process: Summary1.4 Application of Time Reversal in Practice
1.5 Refocusing of Electromagnetic Waves Using Time Reversal
1.5.1 Time-Reversal Cavity
1.5.2 Use of a Limited Number of Sensors
1.5.3 Time Reversal and Matched Filtering
1.6 Applications of Time Reversal in Electrical Engineering
References
2 Time Reversal in Diffusive Media
2.1 Introduction
2.2 Fundamental Properties of Diffusive Media
2.2.1 Understanding and Describing Wave Propagation in Diffusive Media
2.2.2 Statistical Black-Box Modeling
2.3 Time-Reversal Transmissions in Diffusive Media. 2.3.1 Self-Averaging and Spectral Coherence2.3.2 Taking a Broader View: Spatial Speckle and Background Fluctuations
2.3.3 How Accurate are Time-Reversed Fields in Diffusive Media?
2.3.4 Polarization Selectivity
2.3.5 Conversion Efficiency and Power Gain
2.4 Time Reversal for the Generation of Wavefronts
2.4.1 Time-Reversal Dyadic Function
2.4.2 The Burden of a First Radiating Phase
2.4.3 Direct Wavefront Synthesis
2.4.4 Implementing GTR
2.4.5 Retrieving Free-Space Conditions: Experimental Results
2.4.6 An Original Application: Imaging Apertures in a Metallic Shield. 2.5 Final ConsiderationsReferences
3 From Electromagnetic Time-Reversal Theoretical Accuracy to Practical Robustness for EMC Applications
3.1 On the Interest of Time Reversal in the EMC Context
3.2 TR in Transmission Line (TL) Networks
3.2.1 Transmission Line and Time Reversal
3.2.2 Defect or Fault Detection in Transmission Lines
3.2.3 Time-Reversal Wire Diagnosis
3.2.4 Time-Reversal Wire Diagnosis Examples
3.3 Selective EMC Radiated Immunity
3.3.1 From Open Area to Reverberating Environment for EMTR
3.3.2 Optimization of TR Parameters for the RC Numerical Experiment. 3.3.3 EMC Immunity Testing in a Reverberation Chamber3.4 Towards Realistic EMC Testing
3.4.1 Practical Limitations
3.4.2 Robustness and Statistics
3.5 Conclusion
References
4 Amplification of Electromagnetic Waves Using Time Reversal
4.1 Outline
4.2 Introduction
4.3 Measurements
4.3.1 Experimental Setup
4.3.2 Time Compression
4.3.3 Number of Antennas and Influence of the Bandwidth
4.3.4 Size of the Focal Spot
4.3.5 One-Bit Time Reversal
4.3.6 Aperture
4.4 Theoretical Model
4.4.1 Average Amplitude of the Transient Signal
4.4.2 Gain Obtained Using TR.