LIST OF ILLUSTRATIONS Figure Page 9-1 Microwave Rectifier Device Technology 9-3 9-2 Chronology of Collection and Rectification of Microwave Power 9-5 9-3 Major Rectenna Development Programs 9-6 9-4 Simplified Electrical Schematic for the Rectenna Element 9-7 9-5 Rectenna Element Efficiency Vs Frequency 9-8 9-6 Comparison of Antenna Approaches in Meeting Requirements for Reception and Rectification in Space-to-Earth Power Transmission 9-U 9-7 DC Power from Center and Edge Rectenna Elements as Function of Rectenna Dia and Total DC Power Received 9-12 9-8 Rectenna Element Efficiency as Function of Microwave Power Input 9-13 9-9 Microwave Losses in an Optimally Designed Diode as a Function of Input Power Level for a Microwave Impedance Level of 120 Ohms 9-15 9-10 Losses at Low Values of Microwave Input Power 9-16 9-11 Schematic Arrangement of Rectenna 9-17 9-12 Full-Wave Configuration 9-19 9-13 Bridge-Rectifier Configuration 9-19 9-14 Full-Wave and Bridge-Rectifier Configurations in Relationship to Wave Filter Terminals 9-19 9-15 Pseudo Full-Wave Two-Conductor Rectifier 9-20 9-16 Rectenna Construction 9-22 9-17 Rectenna Elements 9-23 9-18 Approach to Environmental Protection of Rectenna Elements 9-24 9-19 Industry Accumulated Production Experience (Billions of Units) 9’26 9-20 High Speed Rectenna Production 9-27 9-21 Basic Rectenna Distribution Layout 9-28 9-22 Estimated dc-ac Interface Losses 9-29 9-23 Inverter Unit Cost Derivation 9-30 9-24 Power Distribution ROM System Cost 9-30 9-25 Total Power Interface ROM Cost 9-31 10.1 RF Spectrum Utilization 10-2
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