| Preface | p. xi |
| Introduction | p. 1 |
| Background | p. 1 |
| Demand and Market Overview | p. 3 |
| System Concept | p. 8 |
| Frequency Band | p. 11 |
| Services and Applications | p. 12 |
| Mobile Radio Service (MRS) | p. 13 |
| Mobile Data Service (MDS) | p. 14 |
| Mobile Telephone Service (MTS) | p. 14 |
| Vehicle Location Service (VLS) | p. 16 |
| Vehicle Location and Information Service (VLIS) | p. 17 |
| Mobile Aeronautical Service (MAS) | p. 17 |
| Typical End-User Applications | p. 18 |
| Space Segment | p. 18 |
| General Description | p. 18 |
| Service Area | p. 22 |
| Possible Antenna Configurations and L-Band Antenna Beams | p. 23 |
| References | p. 24 |
| Mobile Satellite Antennas | p. 27 |
| Introduction | p. 27 |
| Directly Radiating Array Antennas | p. 27 |
| Computed Results and Description | p. 31 |
| Advantages and Disadvantages of Directly Radiating Arrays | p. 35 |
| Imaging Single-Reflector Antenna | p. 37 |
| Application of a Single-Reflector Antenna for MSAT | p. 43 |
| Deployable Reflectors | p. 49 |
| Feed Array for MSAT Reflector Antennas | p. 50 |
| Advantages and Disadvantages of a Single-Aperture Imaging Reflector Antenna over a Directly Radiating Array | p. 60 |
| Imaging Dual-Reflector System | p. 60 |
| Short Description of Analysis Methods | p. 62 |
| Computed Results | p. 66 |
| Discussions on Imaging Dual-Reflector Systems | p. 73 |
| Advantages and Disadvantages | p. 73 |
| References | p. 74 |
| Antenna Specifications and Fixed Terminal Antennas | p. 77 |
| Introduction | p. 77 |
| Low-Gain Antennas and Specifications for Data Communication Applications | p. 77 |
| Medium- and High-Gain Antennas for Mobile Voice Terminals | p. 81 |
| Medium-and High-Gain Antennas and Specifications for Fixed Terminals | p. 82 |
| Helical Antennas | p. 83 |
| Introduction | p. 83 |
| Geometry of the Helix | p. 84 |
| Radiation Pattern Calculations | p. 86 |
| Axial Ratio Calculations | p. 87 |
| Design and Results | p. 87 |
| Cavity-Backed Antennas | p. 95 |
| Cup Crossed-Dipole Radiator | p. 96 |
| General Description | p. 96 |
| Crossed-Dipole Optimization | p. 97 |
| Short Backfire Antennas (SBFA) | p. 102 |
| General Description | p. 102 |
| Application of SBFA as INMARSAT-M Terminal Antenna | p. 104 |
| References | p. 113 |
| Propagation in the Land Mobile Satellite Service | p. 117 |
| Introduction | p. 117 |
| Why Linear Polarization is not Used | p. 118 |
| Reflection From Ground, Terrain, and Utility Poles | p. 120 |
| Power Level and Interference under Various Ground Conditions | p. 123 |
| Measured Results | p. 124 |
| Prairie Location | p. 126 |
| Utility Poles | p. 128 |
| Roadside Rocky Wall or Mountain | p. 130 |
| Effect of Trees on Mobile Terminals | p. 136 |
| Effect of Elevation Angle | p. 138 |
| Roadside Buildings | p. 149 |
| Bandwidth Considerations | p. 152 |
| Comparison of Results | p. 154 |
| System Performance at Different Sites | p. 159 |
| References | p. 159 |
| Low-Gain Mobile Data-Link Antennas | p. 163 |
| Introduction | p. 163 |
| Quadrifilar Helices | p. 163 |
| General | p. 163 |
| Classification of Quadrifilar Helix Antenna | p. 164 |
| Feeding Arrangement of Helices | p. 166 |
| Bifilar Helix to Quadrifilar | p. 166 |
| Analysis of Quadrifilar Helix | p. 172 |
| Comparison between Measured and Theoretical Results | p. 182 |
| Development of Low-Gain Quadrifilar Helical Antennas | p. 183 |
| Crossed-Drooping Dipole | p. 194 |
| Design of the Antenna | p. 194 |
| Classification of the Drooping Dipole Antenna | p. 198 |
| Curved-Shaped Type Crossed-Dipole Antenna | p. 198 |
| Inverted V-Type Drooping Dipoles | p. 207 |
| Inverted U-Type Drooping Dipoles | p. 210 |
| Spiral Antennas | p. 212 |
| Microstrip Antennas | p. 216 |
| Microstrip Disk Antenna Element | p. 216 |
| Resonant Frequencies | p. 217 |
| Radiation Patterns | p. 218 |
| Microstrip Stacked Radiators | p. 223 |
| References | p. 232 |
| Medium-Gain Mobile Voice-Link Antennas | p. 237 |
| Introduction | p. 237 |
| Mechanically Steered Tracking Antennas | p. 237 |
| Tilted Linear Array | p. 238 |
| Mechanism for Mechanically Steering the Vehicle Antenna | p. 241 |
| Reduced Height Tilted Linear Array | p. 244 |
| Planar Yagi-Uda Array | p. 247 |
| Hybrid Mechanically and Electronically Steered Planar Array | p. 251 |
| Anserlin Antenna Array | p. 255 |
| Electronic Beam Squint (EBS) Technique | p. 258 |
| Electronically Steered Arrays | p. 259 |
| Lens-Fed Antennas | p. 260 |
| Introduction | p. 260 |
| Geometry of RKR Lens | p. 264 |
| Description of RKR Array | p. 265 |
| RKR Lens Array Analysis | p. 267 |
| Array Performance and Tracking Mechanism | p. 267 |
| Electronically Steered Parasitic Elements Adaptive Array | p. 273 |
| Introduction | p. 273 |
| Analysis of a Parasitic Dipole Array | p. 275 |
| Results | p. 277 |
| Microstrip Adaptive Array | p. 281 |
| Analysis of Microstrip Adaptive Array | p. 281 |
| Theoretical and Experimental Results | p. 283 |
| Monopole Element Adaptive Array | p. 288 |
| Performance of Monopole Adaptive Array | p. 293 |
| Electronically Steered Phased-Array Antennas | p. 308 |
| Ball Design | p. 309 |
| Beam-Steering Control Circuitry and Performance | p. 311 |
| Teledyne Ryan Design | p. 311 |
| Antenna Performance | p. 312 |
| Other Electronically Steered Planar Phased-Array Antennas | p. 314 |
| Electronically Steerable Spherical Array Antenna | p. 317 |
| Antenna Performance | p. 319 |
| References | p. 322 |
| Noise Temperature and G/T of Mobile Antennas | p. 327 |
| Introduction | p. 327 |
| Sources of Noise Temperature | p. 327 |
| Measurement Techniques for Antenna Noise Temperature | p. 330 |
| Hot-Cold Technique | p. 330 |
| Deep Space Network Technique | p. 332 |
| Comparison of Hot-Cold and DSN Techniques | p. 333 |
| MSAT-X Technique | p. 334 |
| Error Analysis | p. 336 |
| Comparison of DSN and MSAT-X Techniques | p. 336 |
| Antenna Noise Temperature Results | p. 337 |
| G/T Values of Mobile Antennas | p. 344 |
| References | p. 345 |
| Author Index | p. 347 |
| Subject Index | p. 353 |
| Table of Contents provided by Syndetics. All Rights Reserved. |
