Practical_Antenna_Handbook_0071639586

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400 200 300 150 200 100 100 50 X L R o 4 Radiation resistance 37 0 0 100 Reactance 200 300 X C 60 70 80 90 100 110 120 Antenna length (degrees) Figure 9.6A Antenna impedance as a function of antenna length. 238
C h a p t e r 9 : V e r t i c a l l y P o l a r i z e d A n t e n n a s 239 12 11 10 9 Radiation resistance (R RAD ) 8 7 6 5 4 3 2 1 16 8 0 10 20 30 40 50 60 Antenna length (degrees) Figure 9.6B Radiation resistance as a function of antenna length. plane antennas shortly.) There we see (by looking down from directly above) 16 radials equally spaced to cover the full circle around the antenna. At one time it was commonly understood that each radial was to be a quarter-wavelength, where L (feet) = 246/F (MHz). In truth, radials in direct contact with the ground are sufficiently detuned from their free-space characteristics that an exact length is not at all important. Instead, what is important is that enough radials are installed that their far ends are typically no more than 0.05 l apart. A little thought will lead to the counterintuitive realization that the shorter your radials are, the fewer of them you need! And this is, in fact, true. However, it is also true that the shorter your radials are, the less efficient your ground system will be and the higher your ground resistance losses will be. The basic point being made is this: If you have a fixed amount of wire to apply to your system of radials, a few long radials are not as helpful as a greater number of shorter ones. Stated yet another way, it’s better to have longer radials than shorter ones, but if you can only have shorter ones, you don’t need as many before you will have maxed out the performance gains you can accomplish by adding more radials.
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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 206 and 207: 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 253 and 254: Quarter-wave vertical radiator Insu
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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
Page 285 and 286: C h a p t e r 1 1 : V e r t i c a l
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 667
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C h a p t e r 2 9 : T o w e r s 675
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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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