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Control and Measurement of Unintentional Electromagnetic Radiation

Book Description

Full and accessible coverage of the key concepts governing the reduction, containment, and measurement of unintentional electromagnetic radiation.

The rapid proliferation of computers, CD players, and other digital electronic systems in recent years has made unintentional electromagnetic radiation increasingly difficult to control. Control and Measurement of Unintentional Electromagnetic Radiation provides a thorough examination of the basic principles underlying the problem, enabling readers to design solutions and applications to combat it effectively. Using a simple mathematical approach limited to algebra and trigonometry, this timely book meets the growing need for a more complete understanding of electromagnetic phenomena. Essential reading for electronics system designers and users as well as consultants and researchers, this book offers:

  • An overview of intentional electromagnetic radiators -- antennas

  • Examination and modeling of sinusoidal circuit-current radiations

  • Frequency domain descriptions of periodic voltages, including a simple method for decomposing many often-used periodic voltage waveshapes into their sinusoidal components

  • Easily obtainable descriptions of the measured radiations of periodic, time-varying circuit currents

  • Techniques for controlling circuit-current radiations by adjusting different parameters, such as voltage amplitude and waveshape, circuit-current path geometry and impedance

  • Radiation containment principles -- fully and partially contained radiating currents, slot antennas, and more

  • Basic coverage of the radiation measurement process--from antenna calibration, measurement, geometry, and the measurement environment to test-site construction and validation.

Table of Contents

  1. Cover Page
  2. Title Page
  3. Copyright
  4. Contents
  5. PREFACE
    1. TAILOR THIS BOOK TO YOUR NEEDS
  6. CHAPTER 1: INTRODUCTION
    1. 1.1 THE PROBLEM
    2. 1.2 THE CAUSES
    3. 1.3 UNDERSTANDING THE PROBLEM
    4. 1.4 THE BASIC RADIATOR
    5. 1.5 CONTROLLING THE PROBLEM
    6. 1.6 CONTAINING THE PROBLEM
    7. 1.7 MEASURING THE PROBLEM
    8. 1.8 SUMMARY
  7. CHAPTER 2: SINUSOIDAL ANTENNA-CURRENT RADIATIONS
    1. 2.1 INTRODUCTION
    2. 2.2 THE RADIATION OF A CURRENT ELEMENT
    3. 2.3 RADIATION PATTERNS OF LONGER CURRENT SEGMENTS
    4. 2.4 RADIATIONS OF OPEN-ENDED CURRENT SEGMENTS
    5. 2.5 RADIATIONS OF DIPOLE ANTENNAS
    6. 2.6 RADIATIONS OF FOLDED DIPOLE ANTENNAS
    7. 2.7 SUMMARY
  8. CHAPTER 3: SINUSOIDAL CIRCUIT-CURRENT RADIATIONS
    1. 3.1 INTRODUCTION
    2. 3.2 CIRCUIT CURRENTS
    3. 3.3 RADIATION AND CURRENT SEGMENT ORIENTATION
    4. 3.4 CIRCUIT-CURRENT RADIATION PATTERNS
    5. 3.5 THE RADIATIONS OF SMALL CIRCUITS
    6. 3.6 THE RADIATIONS OF LONGER CIRCUITS
    7. 3.7 THE RADIATIONS OF MEDIUM-LENGTH CIRCUITS
    8. 3.8 SUMMARY AND CONCLUSIONS
  9. CHAPTER 4: FREQUENCY DOMAIN DESCRIPTIONS OF PERIODIC VOLTAGES
    1. 4.1 INTRODUCTION
    2. 4.2 MATHEMATICAL FOUNDATIONS
    3. 4.3 BASIC VOLTAGE WAVEFORMS
    4. 4.4 COMMONLY OCCURRING PERIODIC VOLTAGE WAVEFORMS
    5. 4.5 VOLTAGES WITH A LINEAR RISE AND A LINEAR FALL
    6. 4.6 VOLTAGES WITH AN EXPONENTIAL RISE AND AN EXPONENTIAL FALL
    7. 4.7 VOLTAGES WITH A LINEAR RISE AND AN EXPONENTIAL FALL
    8. 4.8 VOLTAGES WITH AN EXPONENTIAL RISE AND A LINEAR FALL
    9. 4.9 CONSOLIDATION
    10. 4.10 SUMMARY
  10. CHAPTER 5: PERIODIC CIRCUIT CURRENTS AND THEIR MEASURED RADIATIONS
    1. 5.1 INTRODUCTION
    2. 5.2 SINUSOIDAL COMPONENTS OF PERIODIC CIRCUIT CURRENTS
    3. 5.3 SINUSOIDAL RADIATIONS OF PERIODIC CIRCUIT CURRENTS
    4. 5.4 MEASURED CIRCUIT CURRENT RADIATIONS
    5. 5.5 THE EFFECT OF THE TRANSITION FACTOR
    6. 5.7 SUMMARY
  11. CHAPTER 6: CONTROL OF CIRCUIT-CURRENT RADIATIONS
    1. 6.1 INTRODUCTION
    2. 6.2 SOURCE VOLTAGE AMPLITUDE
    3. 6.3 CIRCUIT-CURRENT IMPEDANCE
    4. 6.4 SOURCE VOLTAGE WAVESHAPE
    5. 6.5 CIRCUIT-CURRENT PATH WIDTH
    6. 6.6 SUMMARY
  12. CHAPTER 7: CONTAINMENT OF UNINTENTIONAL RADIATIONS
    1. 7.1 INTRODUCTION
    2. 7.2 FULLY CONTAINED RADIATING CURRENTS
    3. 7.3 PARTIALLY CONTAINED RADIATING CURRENTS
    4. 7.4 SUMMARY AND CONCLUSIONS
  13. CHAPTER 8: MEASUREMENT OF UNINTENTIONAL RADIATIONS
    1. 8.1 INTRODUCTION
    2. 8.2 CHARACTERISTICS OF RECEIVING ANTENNAS
    3. 8.3 THE ANTENNA FACTOR
    4. 8.4 THE MEASUREMENT ENVIRONMENT
    5. 8.5 ROUTINE RADIATION MEASUREMENTS
    6. 8.6 SUMMARY
  14. APPENDIX A: USEFUL TRIGONOMETRIC IDENTITIES
    1. A.1 BASIC IDENTITIES
    2. A.2 FURTHER RELATIONSHIPS
    3. A.3 RADIATION PATTERN FACTOR EXPRESSIONS
    4. A.4 TRANSITION FACTOR EXPRESSIONS
  15. APPENDIX B: BASIC VOLTAGE WAVEFORM FOURIER COEFFICIENTS
    1. B.1 INDEFINITE INTEGRALS
    2. B.2 THE BASIC VOLTAGE WAVEFORM v1(t)
    3. B.3 THE BASIC VOLTAGE WAVEFORM v2(t)
    4. B.4 THE BASIC VOLTAGE WAVEFORM v3(t)
    5. B.5 THE BASIC VOLTAGE WAVEFORM v4(t)
  16. BIBLIOGRAPHY
  17. INDEX