Handbook of antennas for EMC / Thereza Macnamara.

Format:

Book

Author/Creator:

Macnamara, Thereza.

Series:

Artech House antenna library

The Artech House antenna library

Language:

English

Subjects (All):

Radio--Antennas.

Radio.

Electromagnetic compatibility.

Radio noise--Measurement.

Radio noise.

Physical Description:

xiv, 328 pages : illustrations ; 24 cm.

Place of Publication:

Boston : Artech House, [1995]

Summary:

The Handbook of Antennas for EMC provides a thorough overview of both the practical and theoretical aspects of antennas in EMC systems and helps you improve your understanding of the nature and uses of antennas in these systems. The treatment throughout is sensitive to the needs of the practicing engineer, providing summaries of the underlying mathematics, while avoiding the theoretical emphasis that characterizes much of the existing literature.

Contents:

1.1 Requirements of an Antenna for EMC 1

1.1.1 Types of Antennas 2

1.2 Main Characteristics of an Antenna 4

1.2.1 Radiation Resistance 5

1.2.2 Radiation Pattern 6

1.2.3 Main Lobe 9

1.2.4 Sidelobes 15

1.2.5 Front-to-Back Ratio 16

1.2.6 Bandwidth 18

1.2.7 Aperture Size 20

1.2.8 Antenna Correction Factors 20

1.2.9 Polarization 21

1.2.10 Relationships Between the Key Parameters 26

Chapter 2 Basic Math for EMC Engineers 35

2.1 Angles 35

2.1.1 Convention for Angles 35

2.2 Basic Trigonometry 37

2.2.1 Reciprocal Trigonometric Functions 39

2.2.2 Inverse Trigonometric Functions 39

2.3 Powers, Indices, and Logarithms 42

2.3.1 Multiplication of Numbers 43

2.3.2 Relationship Between dBm and dBμV 44

2.4 Real and Complex Numbers 45

2.4.1 Addition of Complex Numbers 51

2.4.2 Complex Conjugate 51

2.5 Scalars and Vectors 51

2.5.1 Position Vector 52

2.5.2 Vector Addition and Subtraction 52

2.5.3 Vector Multiplication 53

2.5.4 Phasors 55

2.6 Fourier Analysis and Transforms 57

2.6.1 Fourier Analysis 57

2.6.2 Fourier Transforms 58

2.7 Parameters 61

2.7.1 Mathematical Definition of Parameters 61

2.8 Fundamental Units and Dimensions 63

2.8.1 Checking Formulas by Dimensions 65

Chapter 3 Antenna Theory 67

3.1 Unit Vectors 67

3.2 Scalar and Vector Fields 69

3.2.1 Spatial Rates of Change of Scalar and Vector Fields 70

3.2.2 Gradient of a Scalar Field 70

3.2.3 Divergence of a Vector Field 72

3.2.4 Curl of a Vector 73

3.3 Maxwell's Equations 76

3.3.1 Maxwell's First Equation 76

3.3.2 Maxwell's Second Equation 78

3.3.3 Maxwell's Third Equation 80

3.3.4 Maxwell's Fourth Equation 81

3.4 Boundary Conditions 82

3.4.1 Tangential Component of the Electric Field 82

3.4.2 Tangential Component of the Magnetic Field 84

3.4.3 Normal Component of the Electric Field 85

3.4.4 Normal Component of the Magnetic Field 86

3.5 Fields Due to a Radiating Dipole 86

3.5.1 Fields Due to a Current Element 86

3.5.2 Fields at Large Distances From Wire Antennas 88

3.6 Power Flux Density for a Plane Wave 88

3.7 Wave Impedance for a Plane Wave 91

3.8 Radiation Resistance 92

3.9 Far Field of Antennas 92

3.9.1 Far Field for Wire Antennas 93

3.9.2 Far Field for Aperture Antennas 93

Chapter 4 Antennas for Frequencies Below 1 MHz 97

4.1 Mechanism of Radiation 97

4.2 Near and Far Fields of Radiation 99

4.3 Wave Impedance 99

4.4 Difference Between Receive and Transmit Antennas 101

4.5 Small Antennas 103

4.6 Baluns 104

4.7 Radiation Power Factor 104

4.7.1 Operating Efficiency 108

4.8 Matching Antennas 109

4.9 Effective Length and Effective Height 109

4.9.1 Effective Length 109

4.9.2 Effective Height 111

4.10 E Field Antennas 112

4.10.1 Small Dipole 112

4.10.2 Short Monopoles 115

4.10.3 Ground Plane Dependence 115

4.10.4 Top-Loaded Monopoles 116

4.10.5 Parallel Element E-Field Generator 119

4.11 H Field Antennas 121

4.11.1 Helmholtz Coils 121

4.11.2 Small Magnetic Loops 124

4.11.3 Single-Turn Shielded Loops 125

4.11.4 Simple Multiturn Loop Probe 128

Chapter 5 Antennas for Frequencies Between 1 MHz and 1 GHz 131

5.1 Resonant Monopoles 131

5.2 Discone 133

5.3 Cavitenna 135

5.4 Resonant and Large Dipoles 135

5.5 Folded Dipoles 137

5.6 Triangular Dipoles 140

5.7 Biconical 140

5.8 Yadi-Uda 145

5.9 Frequency-Independent (FI) Antennas 148

5.10 Log-Periodic Antenna 148

5.11 Bilog 148

5.12 Helical Antennas 156

5.13 Large and Resonant Loops 162

5.14 Double-Ridged Horn 164

Chapter 6 Antennas for Frequencies Above 1 GHz 167

6.1 Frequency-Independent Antennas 167

6.2 Band Theory 167

6.3 Log Spiral 171

6.3.1 Modes of Radiation 173

6.3.2 Rotation of Radiation Pattern With Frequency 175

6.3.3 Planar Log Spiral 175

6.3.4 Slot Planar Log Spiral 175

6.3.5 Cavity-Backed Spiral 181

6.3.6 Conical Log Spiral 181

6.4 Archimedean Spiral 196

6.4.1 Cavity-Backed Archimedean Spiral 197

6.5 Microstrip Planar Spiral 200

6.6 Discone Antenna 200

6.7 Double-Ridged Horns 202

6.7.1 Waveguide Theory 203

6.7.2 Modes in Square and Rectangular Waveguides 206

6.7.3 Double-Ridged Waveguides 211

6.7.4 Double-Ridged Waveguide Horns 212

Chapter 7 Calibration of Antennas 221

7.1 Gain 222

7.1.1 Measurement of Gain 223

7.1.2 Purcell's Method 228

7.1.3 Two Antenna Method 232

7.1.4 Three Antenna Method 233

7.2 Calculation of Gain 234

7.2.1 E-Plane Sectoral Horn 234

7.2.2 H-Plane Sectoral Horn 243

7.2.3 Gain of a Pyramidal Horn 250

7.3.1 Accurate Method 252

7.3.2 Semiaccurate Method 253

7.3.3 Approximate Method 253

7.4 Antenna Correction Factor 253

Appendix B Preferred Scientific Prefixes 277

Appendix C List of Scientific Constants 279

Appendix D Conductivities of Common Metals 281

Appendix E Dielectric Constants and Loss Tangents of Common Materials 283

Appendix F Conversion Table for dB[mu]V to [mu]V, dBV, dBW, dBm, and Watts 285

Appendix G The Electromagnetic Spectrum 289

Appendix H Frequency Band Designations 291

Appendix I Conversion Between Gain in dB and Gain as a Linear Ratio Gain in dBi to Linear Gain 293

Appendix J The Periodic Table Listed Alphabetically by Chemical Symbol 295

Appendix K Magnetic Permeabilities of Common Metals 299

Appendix L Polarization Matching Matrix 301

Appendix M Resistivities of Common Materials 303

Appendix N Radio Frequency Protection Guides for Nonionizing Radiation 305.

Notes:

Includes bibliographical references and index.

ISBN:

0890065497

OCLC:

32738002