[eBook Code] Compact Antennas for Wireless Communications and Terminals (eBook Code, 1st)

Introduction xi

Chapter 1. General Information About Printed Antennas 1
Jean-Marc LAHEURTE

1.1. Physical characteristics 1

1.2. Properties, limitations, and applications 4

1.3. Printed rectangular antenna viewed as a wide microstrip line 7

1.4. Manufacturing processes 8

1.5. Microwave substrates 11

Chapter 2. Transmission Line Model 15
Jean-Marc LAHEURTE

2.1. Introduction15

2.2. Equivalent circuit 16

2.3. Input impedance 20

Chapter 3. Cavity Model 25
Jean-Marc LAHEURTE

3.1. Introduction 25

3.2. Formulation of the electromagnetic problem 25

3.3. Calculation of expressions for fields and currents of a rectangular patch 29

3.4. Expressions for principal modes 31

3.5. Cartography of modal currents and associated radiation patterns  33

Chapter 4. Radiation of a Printed Antenna 39
Jean-Marc LAHEURTE

4.1. Introduction 39

4.2. Modelization using two equivalent radiating slots 40

4.3. Calculation of the field radiated by a horizontal radiating slot 43

4.4. Calculation of the field radiated by the rectangular patch 44

4.5. Determination of the radiation pattern in the principal planes 44

4.6. Influence of height 46

4.7. Influence of the ground plane 47

4.8. Polarization 48

4.9. Directivity 49

4.10. Influence of the substrate on resonant frequency: parametric study based on antenna RCS 51

Chapter 5. Electrical Equivalent Circuit of a Printed Antenna 55
Jean-Marc LAHEURTE

5.1. Energy considerations 55

5.2. Equivalent circuit 57

5.3. Determination of WE, WM, and B for a rectangular patch 58

5.4. Modeling using a tank circuit 60

5.5. Quality factor of an antenna 62

5.6. Calculation of radiation quality factor 63

5.7. Calculation of efficiency 64

5.8. Influence of surface waves on bandwidth and efficiency 67

Chapter 6. Feeding Circuits for Microstrip Antennas 69
Jean-Marc LAHEURTE and Benoît POUSSOT

6.1. Introduction 69

6.2. Direct coupling by coaxial probe 71

6.3. Excitation by proximity coupling 73

6.4. Excitation by slot coupling 74

Chapter 7. Circularly Polarized Antennas 89
Jean-Marc LAHEURTE, Marjorie GRZESKOWIAK and Stéphane PROTAT

7.1. Principles of circular polarization 90

7.2. Parasitic radiation – degradation of circular polarization 94

7.3. Patch fed by single or dual excitation 96

7.4. Sequential array 99

7.5. Spiral and quadrifilar helix antennas 108

7.6. Conclusion 119

Chapter 8. Wideband Antennas 121
Xavier BEGAUD

8.1. Multiresonant antennas 122

8.2. Traveling wave antennas 125

8.3. Frequency independent antennas 126

8.4. Ultra-wideband antennas 132

8.5. Conclusion 140

Chapter 9. Miniature Antennas 143
Guillaume VILLEMAUD

9.1. Introduction 143

9.2. Which types of antennas should be used for integration? 144

9.3. Integration limits in a finite volume 145

9.4. Resonant antennas in fundamental mode 146

9.5. Bulk reduction techniques 152

9.6. Multiresonant antennas 164

9.7. Synthesis and discussion 166

Chapter 10. Reconfigurable Antennas 169
Jean-Marc LAHEURTE

10.1. Introduction 169

10.2. Basic topologies and constraints 170

10.3. Switched components: available technologies 174

10.4. Frequency reconfigurable antennas (FRAs) 180

10.5. Introduction to RAs in terms of polarization and radiation pattern 185

10.6. Polarized reconfigurable antennas (PRAs) 187

10.7. Radiation pattern reconfigurable antennas (RPRAs) 190

Chapter 11. Introduction to Antenna Diversity 205
Lionel RUDANT

11.1. Benefits of antenna diversity 205

11.2. Performance of multiantenna systems 214

11.3. Multiantenna systems 222

11.4. Conclusion and looking toward MIMO 228

Bibliography 233

List of Authors 241

Index 243