ISBN-10:
0071474854
ISBN-13:
9780071474856
Pub. Date:
04/06/2007
Publisher:
McGraw-Hill Professional Publishing
Folded Unipole Antennas: Theory and Applications / Edition 1

Folded Unipole Antennas: Theory and Applications / Edition 1

by Jeremy Raines

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Product Details

ISBN-13: 9780071474856
Publisher: McGraw-Hill Professional Publishing
Publication date: 04/06/2007
Pages: 400
Product dimensions: 6.10(w) x 9.20(h) x 1.10(d)

About the Author

Jeremy K. Raines is a full-time consultant,working on various projects involving electromagnetics and antennas.

Table of Contents


Preface     ix
Acknowledgments     xiii
Introduction     1
Introducing the Folded Unipole Antenna     1
A Brief History     2
A Golden Age of Antenna Analysis     5
The Beginning of the Golden Age: Transmission Line Theory     7
The Zenith of the Golden Age: Antenna Theory     10
The Simple Elegance of Antenna Theory     13
The Loaded Monopole Antenna     15
The End of the Golden Age: Numerical Methods     18
Method of Moments for Simple Antennas and Antenna Arrays     22
MoM for Antennas with Multiple Wire Junctions     24
The Perils of Large Matrices     25
Conclusions     26
References     28
Symbols Used in This Chapter     28
The Simplest Configuration     31
Introduction     31
Essential Features of the Configuration     32
The Analysis by Roberts     34
The Analysis by Leonhard, Mattuck, and Pote     35
The Analysis by King and Harrison     37
Equations at the Top of the Folded Unipole     39
Equations at the Base of the Folded Unipole     40
Matrix Formulation     41
Radiated Field and Power     42
Input Impedance and Current     45
Efficiency     46
Being Selective About Examples and Displaying Results     46
Examples of Short Folded Unipole Antennas     47
Examples of Tall Folded Unipole Antennas     56
Conclusions     75
References     76
Symbols Used in This Chapter     76
The Gamma Match Antenna and the Two-Segment Folded Unipole     79
Introduction     79
Essential Features of the GMA and 2SFU     81
Equation at the Top of the GMA     83
Equations at the Base of the GMA     84
Equations at the Boundary Between the Segments of the GMA     85
Matrix Equation for the Currents on the GMA     85
Radiated Field and Power for the GMA     87
Input Impedance and Current for the GMA     88
Efficiency of the GMA     88
Examples of the GMA with Fold Height as the Primary Variable     88
Examples of the GMA with Variable Terminating Reactance and Fold Height     97
Examples of the GMA with Both Terminating Reactances Variable     116
Equations at the Top of the 2SFU     121
Equations at the Base of the 2SFU      122
Equations at the Boundary Between the Segments of the 2SFU     122
Matrix Equation for the Currents on the 2SFU     123
Examples of the 2SFU with Fold Height as the Primary Variable     125
Examples of the 2SFU with Variable Terminating Reactance and Fold Height     132
Examples of the 2SFU with Two Terminating Reactances as Continuous Variables     141
Conclusions     147
Symbols Used in This Chapter     148
The Double Gamma Match Antenna     151
Introduction     151
Equation at the Top of the 2GMA     152
Equations at the Base of the 2GMA     153
Equations at the Boundary z = h[subscript 1]     154
Equations at the Boundary z = h[subscript 2]     154
Matrix Equations for Currents on the 2GMA     155
Example: 0.3 Wavelength 2GMA with a 0.2 Wavelength Fold     157
More Examples: A Variable Length Antenna     159
Conclusions     179
Symbols Used in This Chapter     180
The N-Segment Folded Unipole     181
Introduction     181
Essential Features of the nSFU     182
Equations at the Top of the nSFU     184
Equations at the Base of the nSFU     185
Equations at the Boundaries Between Segments     186
Matrix Equation for Currents on the nSFU     187
The Antenna End Effect     190
Examples of Antenna End Effect     195
Conclusions     203
References     204
Symbols Used in This Chapter     204
The Most General Configuration     207
Introduction     207
Essential Features of the Most General Configuration     208
Equations at the Top of the MGC     211
Equations at the Base of the MGC     212
Equations at the Boundaries Between Segments     214
Matrix Equation for the Currents on the MGC     216
Conclusions     218
Symbols Used in This Chapter     218
Characteristic Impedance     221
Introduction     221
Hallen's Definition of Common Mode Characteristic Impedance     222
Schelkunoff's Definition of Common Mode Characteristic Impedance     224
Characteristic Impedance According to Fundamental Transmission Line Theory     225
Quasi Static Log Potential Theory     229
Characteristic Impedance of a Single Circular Cylinder     232
Characteristic Impedances of Two Parallel Cylinders      237
Characteristic Impedances of N Parallel Cylinders     245
The Inverted Unipole     250
Conclusions     254
References     255
Symbols Used in This Chapter     256
Reradiation and Detuning     259
Introduction     259
Current Induced by an Incident Electromagnetic Wave     260
Full Length Detuning     262
Examples of Full Length Detuning     266
Lower Section Detuning     269
Examples of Lower Section Detuning     274
Upper Section Detuning     277
Examples of Upper Section Detuning     281
MidSection Detuning     284
Examples of MidSection Detuning     288
Additional Detuning Configurations     292
Conclusions     293
Reference     295
Symbols Used in This Chapter     295
Arrays of Folded Unipoles     297
Introduction     297
The Complete Electromagnetic Field of the Folded Unipole Antenna     299
Complete Fields of Forward Traveling Current Waves     301
Complete Fields of Reverse Traveling Current Waves     306
Current Induced by the Exact Electromagnetic Field      310
Voltage Induced by the Exact Electromagnetic Field     317
Electromagnetic Coupling Between Array Elements     319
Transformation for the Radiated Electromagnetic Field     323
An Array of Series-Fed Monopole Antennas     325
An Array of Folded Unipole Antennas     331
Arrays of Folded Unipoles with N Elements     340
An Array of Active Folded Unipole Antennas     348
Electromagnetic Coupling Factor for Arbitrary Cross Sections     353
Conclusions     355
References     357
Symbols Used in This Chapter     357
Synergy     361
Introduction     361
Extreme Top Loading     362
Multiplexing     365
Helical Folded Unipole Antennas     371
The Folded Unipole Antenna in Medicine, Geophysics, and Complex Environments     378
The Human Body as a Folded Unipole Antenna     385
Conclusions     389
References     391
Symbols Used in This Chapter     391
Index     395

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