electromagnetic shielding single and multiple shielding layers using shielding effectiveness...

Download Electromagnetic shielding single and multiple shielding layers using shielding effectiveness depending on impedance method

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  1. 1. COURSE SUBJECT ELECTROMAGNETIC SHIELDING OFFERED By Prof.Dr. Mustfa Merdan Submitted by Khalid Saeed Al-Badri
  2. 2. 1 T.C SLEMAN DEMREL UNIVERSITY FEN BLMLER ENSTTS Mhendislik fakltesi ELEKTRONK VE HABERLEME MHENDSL COURSE SUBJECT ELECTROMAGNETIC SHIELDING COURSE OFFERED By Prof. Dr. Mustafa MERDAN ELECTROMAGNETIC SHIELDING SINGLE AND MULTIPLE SHIELDING LAYERS USING SHIELDING EFFECTIVENESS DEPENDING ON IMPEDANCE METHOD Submitted by MSc. Student Badri-Khalid Saeed Lateef Al Student No. 1330145002
  3. 3. 2 ELECTROMAGNETIC SHIELDING SINGLE AND MULTIPLE SHIELDING LAYERS USING SHIELDING EFFECTIVENESS DEPENDING ON IMPEDANCE METHOD Submitted by MSc. Student Khalid S. Al-Badri
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  5. 5. I CONTENTS ACKNOWLEDGEMENTS............................................................................................................ III LIST OF FIGURES ......................................................................................................................IV LIST OF SYMBOLS...................................................................................................................VIII Chapter 1........................................................................................................................... 1 Electromagnetic field and Maxwells Equations Review..................... 1 Electromagnetic radiation..................................................................................................... 1 History of the theory............................................................................................................. 2 Electromagnetic field............................................................................................................ 3 Maxwells Equations: Time-Varying Form......................................................................... 4 Integral Form of Maxwells Equations ............................................................................. 5 Electromagnetic radiation..................................................................................................... 6 Electromagnetic spectrum .................................................................................................... 8 What is Electromagnetic Shielding?................................................................................... 10 History of the Shielding...................................................................................................... 11 Faraday Cage:................................................................................................................. 12 Shielding Materials............................................................................................................. 14 Permeability and Permittivity ............................................................................................. 14 Permeability.................................................................................................................... 14 Permittivity..................................................................................................................... 15 Standard Metallic And Ferromagnetic Materials ................................................................ 15 Chapter 2......................................................................................................................... 18 How Shielding Actually Works.......................................................................... 18 Introduction ........................................................................................................................ 18 Types of EM Fields ............................................................................................................ 18 Plane Waves ................................................................................................................... 18 Electric Fields (E-Fields)................................................................................................ 20 Magnetic Fields (H Fields) ............................................................................................. 20 What is EMI and EMC....................................................................................................... 21 Electromagnetic interference (EMI) ............................................................................... 21 Electromagnetic compatibility (EMC)............................................................................ 21 Shielding effectiveness....................................................................................................... 22 Key parameters in shield design (electric field).................................................................. 24
  6. 6. II Skin Depth...................................................................................................................... 24 Chapter 3......................................................................................................................... 28 Effectiveness of Single and Malty Layers Shielding............................ 28 Introduction ........................................................................................................................ 28 Plane Wave Propagation..................................................................................................... 28 NEAR FIELDS AND FAR FIELDS .................................................................................. 30 Reflection and Refraction at Plane Interface between Two Media: Oblique Incidence . 34 Single Dielectric Slab ......................................................................................................... 36 Absorption.......................................................................................................................... 37 Internal Reflection.............................................................................................................. 38 Case Study (single Slab)..................................................................................................... 39 Numerical Example............................................................................................................ 46 Multilayer Structures .......................................................................................................... 48 Two Dielectric Layer Slabs Structure............................................................................. 48 More Than Two Dielectric Layer Slabs Structure .......................................................... 50 Absorber Materials ............................................................................................................. 52 Microwave Absorber Materials .......................................................................................... 55 Resonant Absorbers............................................................................................................ 57 Dallenbach Tuned Layer Absorbers ............................................................................... 58 Salisbury Screens............................................................................................................ 60 Jaumann Layers.............................................................................................................. 61 Graded Dielectric Absorbers: Impedance Matching........................................................... 63 Pyramidal Absorbers ...................................................................................................... 63 Tapered Loading Absorbers............................................................................................ 65 Matching Layer Absorbers ............................................................................................. 66 Cavity Damping Absorbers ................................................................................................ 67 Anechoic Chambers............................................................................................................ 69 Absorber Materials Used in Anechoic Chambers ............................................................... 70 Metamaterial Shielding....................................................................................................... 72 Metamaterials Introduction............................................................................................. 72 Shielding With Metamaterial.......................................................................................... 74 References.............................................................................................................................. 80
  7. 7. III ACKNOWLEDGEMENTS I should present my private thanks to Prof. Dr. Mustafa MERDAN, for his excellent help, guidance, and encouragement me with an excellent atmosphere. And I should present many thanks to my family father, mother, and my brothers. Also I present greet thanks to my wife and child Khalid SAEED AL-BADRI Isparta, 2015
  8. 8. IV LIST OF FIGURES FIGURE 1. THE MAGNETISM IS ULTIMATELY CAUSED BY MOVING ELECTRIC CHARGES OR CURRENT, WHEN HE OBSERVED A MAGNETIC COMPASS NEEDLE TO REACT TO A CURRENT FLOWING THROUGH A WIRE PLACED NEAR IT......................................1 FIGURE 2. JAMES CLERK MAXWELL'S 1873.........................................................2 FIGURE 3. AN ELECTRIC CURRENT IN A WIRE CREATES A CIRCULAR MAGNETIC FIELD AROUND THE WIRE, ITS DIRECTION (CLOCKWISE OR COUNTER-CLOCKWISE) DEPENDING ON THAT OF THE CURRENT..........................................................3 FIGURE 4. AN ELECTROMAGNETIC FIELD (ALSO EMF OR EM FIELD) IS A PHYSICAL FIELD PRODUCED BY ELECTRICALLY CHARGED OBJECTS...............................................4 FIGURE 5. THE ELECTROMAGNETIC PLANE WAVE...................................................7 FIGURE 6........................................................................

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