INDEX 



The subject indexes of all STR volumes are combined in a master index printed in a separate volume 

 For access to the index volume consult the Army or Navy Agency listed on the reverse of the half-title page. 



A scope, calibration, 161-162 

 Aircraft targets, radar cross section 



measurement, 185-186 

 Antenna, general characteristics 

 beam width, 22 



characteristics in transmission, fl 

 diameter, 29-31 

 effective length, 13 

 function, 22 

 horns, 44 



impedance of nearby conductors, 24 

 pattern factors in ground ri'Hectioii, 



23 

 radiation patterns, 22-23 

 radiation I'esistance, 24 

 Antenna arrays, 33-39 

 binomial, 38-39 

 broadside, 34-38 

 colinear, 34-38 

 dipole, basic types, 34 

 multidimensional, 38 

 principle, 33-34 

 ring, 39 



two-dipole side-by-side, 34-35 

 unidirectional, 38 

 Antenna gain 

 calculation, 16-17 

 definition, 16 

 description, 22 

 jungle locations, effect on gain, 195- 



196 

 propagation factor in interference 



region, 69 

 wood location, effect on gain, 195- 

 196 

 Antenna types, 22-33, 39-43 

 directive antennas, 22-23 

 multiple half-wave, 27-28 

 parabolic reflector antennas, 42-43 

 parasitic antennas, 39-42 

 resonant antennas, 23 

 standing-wave antennas, 23, 25-32 

 traveling-wave antennas, 23-24, 32- 

 33 

 Atmospheric ducts 



effect on set performance, 163 

 formation, 4 

 types, 4 

 Atmospheric stratification, effect on 



refraction, 50-52 

 Attenuation, definition, 5 

 Attenuation factors, radio gain calcu- 

 lation, 61 



Beacons, performance characteristics, 

 169 



Beam width, antennas, 22 

 Binomial arrays, antenna, 38-39 

 Brewster angle of reflection, defineil, 54 

 Broadside arrays, antenna, 34-38 



one-dimensional array, 35-38 



side-by-side airay, 34 



unidirectional array, 38 



Calibration, A scope, 161-162 

 Clarendon Laboratory at Oxford, con- 

 ductivity of sea water, 55 

 Coastal diffraction, transmission, 178- 

 181 

 cUff site, 181 

 field strength, 179-181 

 level site near coast, 178-179 

 Colinear arrays, antenna, 34-38 

 one-dimensional array, 38 

 two half-wave dipole array, 35 

 unidirectional array, 38 

 Columbia University Wave Projiaga- 



tion Group, 1 

 Communication equipment, perform- 

 ance characteristics, 169 

 Conductivity, soil, 56-57 

 Cophased dipole antenna, 28-29 

 Corner-reflector antenna, 42 

 Cornu's spiral, diffraction theorv, 172- 



173, 175 

 Coverage diagrams, generalized coordi- 

 nates, 144-159 

 basic parameters, 144-145 

 normalized free-space distance, 145- 



147 

 path-difference parameter, 145, 147 

 use of charts, 147-159 

 Coverage diagrams, methods of con- 

 struction, 132-144 

 lobe-angle method, 138-144 

 P-Q method, 132-135 

 U-V method, 135-138 

 Coverage diagrams, plane earth, 129- 

 131 

 field strength, 129 

 horizontal polarization, 129-130 

 vertical polarization, 130-131 

 Coverage diagrams, spherical earth, 



131-132 

 Curvature of earth 



calculation of radio gain below inter- 

 ference region, 92 

 geometrical relationships, 62 

 Curvature of radio waves 



curvature relationships, 47-48 

 diffraction by earth's curvature, 58 

 rays in standard atmosphere, 3-4 



Definition of propagation, 1 

 Dielectric constant, soil, 56-57 

 Dielectric constant, water, 54-55 

 Dielectric earth 

 graphical calculations, radio gain 



95-108 

 radiation field characteristics, 65-67 

 sea water as dielccti-ic earth, 66 

 Diffraction 



by terrain, 170-181 

 coastal diffraction, 178-181 

 Cornu's spiral, 172-173, 175 

 definition, 58 



earth's curvature diffi-action, 58 

 Fresnel diffraction theory, 170-175 

 hill diffraction, 175-178 

 raindrop diffraction, 59 

 reflecting ground, 177-178 

 slot diffraction, 175 

 summary, 58 

 target diffraction, 58-59 

 transmission factor, 7 

 Diffraction regions, radio gain calcula- 

 tion, 62-63 

 Dimensionless coordinates, radio gain 



calculations, 77-78 

 Dimensionless parameters, radio gain 



calculation, 75-77 

 Dipole arrays, basic types, 34 

 Directive antennas, 22-23 

 Divergence factor 

 ground reflection, 57 

 lobe length determination, 139-140 

 propagation in interference region, 



68-69 

 spherical earth i-adio gain calcula- 

 tions, 75 

 transmission characteristic, 7 

 Doublet antennas, radio gain, 5 

 Ducts, atmospheric 



effect on set performance, 163 

 formation, 4 

 types, 4 



Earth conductivity, 61 

 Echo constant, radar coverage measure- 

 ment, 182 

 Effective length, antenna, 13 

 Electric doublet antenna in free space, 

 12-15 



radiation, 12-13 



received power, 13-14 



scattered power, 13-14 



transmission, 14-15 

 End-fire arrays, antenna, 34 



203 



