Practical_Antenna_Handbook_0071639586

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234 P a r t I I I : H i g h - F r e q u e n c y B u i l d i n g - B l o c k A n t e n n a s Voltage / 4 Radiator Current Coax to XMTR Max Min Figure 9.4B Current and voltage distribution along l/4 vertical. Figure 9.4C Simple coaxial-fed vertical antenna. / 4 Radiator / 4 Radials Transmission line The radials of a ground-plane vertical antenna are typically installed at some vertical angle between horizontal (0 degrees) and, say, 45 degrees below horizontal. Figure 9.4D is an example of the latter case, showing a groundplane antenna made with “drooping” radials. Similarly, Fig. 9.4E is an example of a groundplane vertical having perfectly horizontal radials. Sometimes the feedpoint VSWR of the antenna can be improved by adjusting the degree of “droop” in the vertical’s radials. Unlike ground-mounted verticals, the “ground plane” formed by the radials of Fig. 9.4E does not preclude the existence of a far E-field below the horizontal plane of the radials, as suggested by the (solid line) pattern in the figure. Figure 9.4D Mast-mounted vertical uses radials as a counterpoise ground.
Quarter-wave vertical radiator Insulator Quarter-wave ground-plane rods Coaxial transmission line Ground-plane antenna Ground-plane antenna Horizontal plane Figure 9.4e Ground-plane vertical antenna. Radiation pattern 235
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Practical Antenna Handbook
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Practical Antenna Handbook Joseph J
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Contents Preface . . . . . . . . .
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C o n t e n t s vii 12 The Yagi-Uda
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C o n t e n t s ix Switched-Pattern
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Preface My paternal grandfather was
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P r e f a c e xiii this book repres
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Acknowledgments As with other field
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Background and History Part I Chapt
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CHAPTER 1 Introduction to Radio Com
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C h a p t e r 1 : I n t r o d u c t
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Fundamentals Part II Chapter 2 Radi
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CHAPTER 2 Radio-Wave Propagation To
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C h a p t e r 2 : r a d i o - W a v
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R N-1 C h a p t e r 2 : r a d i o -
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Figure 2.29C Monthly averaged sunsp
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CHAPTER 3 Antenna Basics An antenna
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C h a p t e r 3 : A n t e n n a B a
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CHAPTER 4 Transmission Lines and Im
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C h a p t e r 4 : T r a n s m i s s
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Chapter 5 Antenna Arrays and Array
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C h a p t e r 5 : a n t e n n a A r
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A. B. C. D. E. F. G. H. Figure 5.9
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B. C. D. E. F. G. H. Figure 5.10 Gr
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High-Frequency Building-Block Anten
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CHAPTER 6 Dipoles and Doublets A co
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C h a p t e r 6 : D i p o l e s a n
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Page 202 and 203: C h a p t e r 6 : D i p o l e s a n
Page 225 and 226: CHAPTER 7 Large Wire Loop Antennas
Page 227 and 228: C h a p t e r 7 : L a r g e W i r e
Page 235 and 236: CHAPTER 8 Multiband and Tunable Wir
Page 237 and 238: C h a p t e r 8 : M u l t i b a n d
Page 247 and 248: CHAPTER 9 Vertically Polarized Ante
Page 249 and 250: C h a p t e r 9 : V e r t i c a l l
Page 251: C h a p t e r 9 : V e r t i c a l l
Page 269 and 270: Directional High-Frequency Antenna
Page 271 and 272: CHAPTER 10 Wire Arrays When a singl
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Page 277 and 278: Wire 2 C h a p t e r 1 0 : W i r e
Page 283 and 284: CHAPTER 11 Vertical Arrays Despite
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Page 295 and 296: CHAPTER 12 The Yagi-Uda Beam Antenn
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C h a p t e r 1 2 : T h e Y a g i -
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CHAPTER 13 Cubical Quads and Delta
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C h a p t e r 1 3 : C u b i c a l Q
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Figure 13.5 Multiband quad “spide
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High-Frequency Antennas for Special
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CHAPTER 14 Receiving Antennas for H
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C h a p t e r 1 4 : r e c e i v i n
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351 Figure 14.12 Remote tuning sche
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CHAPTER 15 Hidden and Limited-Space
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C h a p t e r 1 5 : H i d d e n a n
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CHAPTER 16 Mobile and Marine Antenn
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C h a p t e r 1 6 : M o b i l e a n
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CHAPTER 17 Emergency and Portable A
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C h a p t e r 1 7 : E m e r g e n c
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Antennas for Other Frequencies Part
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CHAPTER 18 Antennas for 160 Meters
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C h a p t e r 1 8 : a n t e n n a s
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CHAPTER 19 VHF and UHF Antennas The
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C h a p t e r 1 9 : V H F a n d U H
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CHAPTER 20 Microwave Waveguides and
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C h a p t e r 2 0 : M i c r o w a v
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λ o = c / f 8 3× 10 m / s = 9 C h
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CHAPTER 21 Antenna Noise Temperatur
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C h a p t e r 2 1 : A n t e n n a N
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C h a p t e r 2 1 : A n t e n n a N
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CHAPTER 22 Radio Astronomy Antennas
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C h a p t e r 2 2 : R a d i o A s t
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Figure 22.9 Interferometer pattern.
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CHAPTER 23 Radio Direction-Finding
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C h a p t e r 2 3 : R a d i o D i r
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Figure 23.9 Adcock array RDF antenn
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Figure 23.11 Watson-Watt Adcock arr
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Tuning, Troubleshooting, and Design
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CHAPTER 24 Antenna Tuners (ATUs) Th
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C h a p t e r 2 4 : a n t e n n a T
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CHAPTER 25 Antenna Modeling Softwar
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C h a p t e r 2 5 : A n t e n n a M
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Figure 25.3B Bent dipole wire and s
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CHAPTER 26 The Smith Chart The math
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Figure 26.2 Normalized impedance li
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A Figure 26.3 Constant resistance c
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A Figure 26.4A Constant inductive r
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C h a p t e r 2 6 : T h e S m i t h
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D C B A Figure 26.5 Radially scaled
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0.165 Y ' 1.0 j1.1 G' 1.0 Y ' 0.2
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CHAPTER 27 Testing and Troubleshoot
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C h a p t e r 2 7 : T e s t i n g a
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Mechanical Construction and Install
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CHAPTER 28 Supports for Wires and V
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C h a p t e r 2 8 : S u p p o r t s
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CHAPTER 29 Towers At some point, th
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C h a p t e r 2 9 : T o w e r s 655
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C h a p t e r 2 9 : T o w e r s 657
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C h a p t e r 2 9 : T o w e r s 659
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C h a p t e r 2 9 : T o w e r s 661
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C h a p t e r 2 9 : T o w e r s 667
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C h a p t e r 2 9 : T o w e r s 669
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C h a p t e r 2 9 : T o w e r s 675
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C h a p t e r 2 9 : T o w e r s 677
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C h a p t e r 2 9 : T o w e r s 681
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CHAPTER 30 Grounding for Safety and
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C h a p t e r 3 0 : G r o u n d i n
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CHAPTER 31 Zoning, Restrictive Cove
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C h a p t e r 3 1 : Z o n i n g , R
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C h a p t e r 3 1 : Z o n i n g , R
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Appendices
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APPENDIX A Useful Math The material
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A p p e n d i x A : U s e f u l M a
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Appendix B Suppliers and Other Reso
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A p p e n d i x B : S u p p l i e r
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B.1.6 Rotators and Controllers Alfa
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Index Note: Boldface numbers denote
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I n d e x 747 Binns, Jack, first ma
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I n d e x 749 dipole (Cont.): slopi
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I n d e x 751 grounding and ground
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I n d e x 753 ionospheric propagati
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I n d e x 755 maximum effective len
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I n d e x 757 noise (Cont.): sky no
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I n d e x 759 reactance: cancellati
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I n d e x 761 standing waves: on an
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I n d e x 763 transmission lines, 1
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I n d e x 765 vertically polarized
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I n d e x 767 Yagi antennas (Cont.)
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