Page 8 - Satellite Communications, Fourth Edition

Dennis Roddy v

6.7 Radiation Pattern 145
6.8 Beam Solid Angle and Directivity 146

6.9 Effective Aperture 148
6.10 The Half-Wave Dipole 149

6.11 Aperture Antennas 151
6.12 Horn Antennas 155

6.12.1 Conical horn antennas 155
6.12.2 Pyramidal horn antennas 158

6.13 The Parabolic Reflector 159
6.14 The Offset Feed 165

6.15 Double-Reflector Antennas 167
6.15.1 Cassegrain antenna 167

6.15.2 Gregorian antenna 169
6.16 Shaped Reflector Systems 169

6.17 Arrays 172
6.18 Planar Antennas 177

6.19 Planar Arrays 180
6.20 Reflectarrays 187

6.21 Array Switching 188
6.22 Problems and Exercises 193

References 196
Chapter 7. The Space Segment 199

7.1 Introduction 199
7.2 The Power Supply 199

7.3 Attitude Control 202
7.3.1 Spinning satellite stabilization 204

7.3.2 Momentum wheel stabilization 206
7.4 Station Keeping 209

7.5 Thermal Control 211
7.6 TT&C Subsystem 212

7.7 Transponders 213
7.7.1 The wideband receiver 215

7.7.2 The input demultiplexer 218
7.7.3 The power amplifier 218