This book provides a new, more accurate and efficient way for design engineers to understand electromagnetic theory and practice as it relates to the shielding of electrical and electronic equipment. The author starts by defining an electromagnetic wave, and goes on to explain the shielding of electromagnetic waves using the basic laws of physics. This is a new approach for the understanding of EMI shielding of barriers, apertures and seams. It provides a reliable, systematic approach that is easily understood by design engineers for the purpose of packaging the electrical and electronic systems of the future. This book covers both theory and practical application, emphasizing the use of transfer impedance to explain fully the penetration of an electromagnetic wave through an EMI gasketed seam. Accurate methods of testing shielding components such as EMI gaskets, shielded cables and connectors, shielded air vent materials, conductive glass and conductive paint are also covered.
- Describes in detail why the currently accepted theory of shielding needs improvement.
- Discusses the penetration of an electromagnetic wave through shielding barrier materials and electromagnetic interference (EMI) gasketed seams.
- Emphasizes the use of transfer impedance to explain the penetration of an electromagnetic wave through an EMI gasketed seam.
- The definition of an electromagnetic wave and how it is generated is included.
- Chapter in the book are included that reinforce the presented theory.
George M. Kunkel, has been an EMC design engineer for over 50 years of his life. He earned both his B.S. and M.S. degrees in engineering at UCLA. The first 30 years of his career was spent accepting full responsibility for the EMC design and test of systems. His professional responsibilities include being Chairman of the Technical Committee on Interference control for an 18 year period (1969 to 1987) and Chairman of a Shielding Theory and Practice working group over a period of six years (2002 through 2008) of the EMC Society of the IEEE. Mr. Kunkel has written and presented over 100 technical articles at various IEEE sponsored International Symposia and edited professional publications. He also taught courses on EMC System Design at UCLA extension.
Chapter 1. Introduction.- Chapter 2. Theory of Shielding.- Chapter 3. Generation of Electromagnetic Waves.- Chapter 4. Penetration of EM Wave through Shielding Barrier.- Chapter 5. Penetration of EM Wave through Gasketed Seam.- Chapter 6. Radiated Field Strengths from Radiated Elements.- Chapter 7. Optimal Use of EMI Gaskets.- Chapter 8. Review of current test methods used to grade EMI gaskets by industry.- Shielding Air Vent Materials.- Chapter 9. Silver Elastomeric Specification MIL-DTL-83528.- Chapter 10. Shielding Effectiveness Theory of Shielding.- Chapter 11. Shielded Wires and Cables.- Chapter 12. Shielding Air Vent Materials.- Chapter 13. Shielding Effectiveness Testing of Space Blanket.- Chapter 14. Test Methods for Testing EMI Gaskets (a Review of IEEE-1302).- Chapter 15. Transfer impedance testing of EMI gaskets.- Chapter 16. Shielding Effectiveness Testing of Shielding Components.- Chapter 17. Transfer impedance testing of shielded cables, back shells and connectors.