Electromagnetic Shielding

ISBN-13: 9780849363726 / Angielski / Twarda / 2005 / 336 str.

Kenneth L. Kaiser

Opis

In chapters culled from popular and critically acclaimed Electromagnetic Compatibility Handbook, Electromagnetic Shielding provides a tightly focused, convenient, and affordable reference for those interested primarily in this subset of topics. Author Kenneth L. Kaiser demystifies shielding and explains the source and limitations of the approximations, guidelines, models, and rules-of-thumb used in this field. The material is presented in a unique question-and-answer format that gets straight to the heart of each topic. The book includes numerous examples and uses Mathcad to generate all of the figures and many solutions to equations. In many cases, the entire Mathcad program is provided.

Spis treści

Plane Wave Shielding
The "Magic" of Shielding Waves Revealed
The Impedance of a Wave
Impedance of Air, Real Metals, and Real Insulators
Reflection and Transmission Coefficients
Plane Wave Power
Single-Layer Conducting Shield
Thin Shields and Reflection Loss
Thick Shields and Absorption Loss
Skin Depth
Skin Depth for Good Insulators
Skin Depth for Several Good Metals
Complex Permittivity and RF Through Human Fat
Microwaves through Human Fat
Table of Dielectric Constants and Loss Tangents
Loss in dB Per Skin Depth
Reflection, Absorption, and Multiple-Reflection Losses
Effect of Dielectric Constant on Shielding
Near Field or Far Field?
Wave Impedance

Electric Field Shielding
The "Magic" of Electric Field Shielding Revealed
Size is Important!
Shielding Reciprocity?
Using Capacitance to Model Shielding
Capacitor Shielding
Three-Terminal Capacitor
Shielding Cans
Finite-Conductivity Spherical Bodies
Step Response of Spherical Bodies
Finite-Conductivity Cylindrical Body
Electric Blankets and Infants
Typical Electric Field Strengths
Current Through and Voltage Across a Field-Immersed Person
Insulating Spherical Shields
Insulating Cylindrical Shields
EQS and Perfect Conductors

Magnetic Field Shielding
The "Magic" of Magnetic Field Shielding Revealed
Magnetic Field from Simple Current Distributions
Magnetic Fields for Other Current Distributions
Magnetic Field Boundary Conditions
Flux Shunting Explained via Boundary Conditions
Self Shielding Nature of Coax
Method of Images for Currents
Wire Partners Can Reduce Fields
Thick Poor Conductors
Thin Good Conductors
Spherical and Cylindrical Conducting and Magnetic Shields
Pure Magnetic Spherical Shell
Pure Magnetic Cylindrical Shell
Finite-Length Cylindrical Shell
Shielding the Source and Shielding Reciprocity
Shielding a Cosmetologist with a Body Suit
Power Line Shielding via Burying
Wave Impedance Concept
Flat Shielding of Current-Carrying Loops
Grounding Shields
Cheap Shielding
Nonideal Shapes
Reducing the Magnetic Coupling Between Inductors
Typical Magnetic Flux Densities
MQS and Perfect Conductors
Decoupled Time-Varying Electric and Magnetic Fields

Additional Shielding Concepts
When Is a Shield Flat?
Performance of a Shielded Room
Laminated Shields
Shields with an Air Gap
Gold Coating on Glass
Laminates for Magnetic Fields
Rust Never Sleeps-Corrosion
Surface Impedance
Voltage and Current along a Chassis
Impedance of Coated Conductors
Nontraditional Shielding Materials
Shielding Effectiveness vs. Surface Resistance
Near-Field Electric Shielding Effectiveness
An Equipotential Surface
Electric vs. Magnetic Field Measurements
Single-Conductor Transmission Line
TEM, TE, and TM Waves
Cutoff Frequency of a Waveguide
Attenuation Beyond Cutoff
Seepage through a Seam
One Large Hole vs. Several Smaller Holes
Honeycomb Ventilation Openings
Coupling through an Aperture
Radio in a Metal Box
Lightning Protection Inside an Automobile

O autorze

Kenneth L. Kaiser