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Microwave Power Transmission Studies Vol 1 of 4

Cover 1
Document Data 3
Table Of Contents 5
Executive Summary 20
1. Introduction 21
2. DC to RF Conversion 23
3. Transmitting Antenna and Phase Front Control 28
4. Mechanical Systems 35
5. Flight Operations 41
6. Receiving Antenna 44
7. Systems Analysis and Evaluation 47
8. Critical Technology 53
9. Critical Technology and Test Program 56
10. Recommendations for Additional Studies 61
List Of Illustrations 15
Fig 1 MPTS Concept 22
Fig 2 MPTS Functional Diagram 22
Fig 3 Comparison of Gaseous Absorption and Rain Attenuation 24
Fig 4 Transmission Efficiency - Molecular Absorption and Rain 24
Fig 5 Amplitron Assembly 25
Fig 6 Amplitron Weight/ Cost/Efficiency Vs. Frequency 25
Fig 7 Amplitron Weight and Cost Vs. Power 25
Fig 8 MPTS 5 kWAmplitron Parameters 26
Fig 9 MPTS 5 kW Amplitron Power Budget 26
Fig 10 Efficiency Vs Output Power for Solenoid-Focused Klystron 27
Fig 11 Outline of 48 kW Klystron with Solenoid Focusing 27
Fig 12 MPTS 48 kW Klystron Parameters 28
Fig 13 MPTS 48 kW Klystron Power Budget 28
Fig 14 Microwave Power Beam - Idealized 29
Fig 15 Receiving Antenna Sizes for Truncated Gaussian Beam Tapers 29
Fig 16 Taper Effect on Pattern and Efficiency 30
Fig 17 Array-Subarray Organization 30
Fig 18 Subarray size considerations 31
Fig 19 Command and Adaptive Phase Front Control Concepts 32
Fig 20 Subarray Types 33
Fig 21 Alternative Array Types 33
Fig 22 Amplitron Thermal Model 34
Fig 23 Subarray Deflection vs Size 34
Fig 24 SPS Incremental Cost vs Subarray Size 36
Fig 25 Subarray Layout 36
Fig 26 Transmitting Antenna Pointing SystemFigure 27 37
Fig 27 Rotary Joints 37
Fig 28 Antenna Structural Arrangement 39
Fig 29 Structure/Waveguide Interface 39
Fig 30 Comparison of Max Temp and Thermal Gradients 40
Fig 31 Structural Joints 40
Fig 32 Typical Antenna Deflections Due to Thermal Gradients 41
Fig 33 Typical Slopes of Structure Due to Thermal Gradients 41
Fig 34 Assembly Functional Flow 16
Fig 35 Mission Options 16
Fig 36 Waveguide Weight and Packaging Density 16
Fig 37 Detail Part Assembly Summary 16
Fig 38 Traffic and Fleet Size Summary 43
Fig 39 Transportation and Assembly Cost - Plan 1 45
Fig 40 Comparison of Antenna Approaches 45
Fig 41 Rectenna Element Efficiency vs Frequency 46
Fig 42 Rectenna Elements 46
Fig 43 Diode Production Experience 48
Fig 44 Orbital Transportation/Assembly and Power Source Parameters 48
Fig 45 SPS Capital Cost vs Frequency - 100 $/kg 48
Fig 46 SPS Capital Cost vs Frequency - 300 $/kg 49
Fig 47 Peak Ground Power Density vs Frequency 49
Fig 48 Amplitron-Aluminum MPTS Comparison 51
Fig 49 Comparison of 5 GW Systems 51
Fig 50 MPTS Efficiency Budget 52
Fig 51 SPS Capital Cost for Various Power Source Characteristics 52
Fig 52 SPS Energy Cost for Various Power Source Characteristics 52
Fig 53 SPS Energy Cost for Various Rates of Return 52
Fig 54 SPS Energy Cost for Various Construction Cycles 52
Fig 55 Suggested Nominal Values for SPS and MPTS 53
Fig 56Technology and Hardware Development Risk Rating Definition 54
Fig 57 Satellite Power System Technology Risk Assessment 55
Fig 58 MPTS Ground Test Functional Block Diagram 57
Fig 59 MPTS _ Critical Technology Development and Ground Test Program 57
Fig 60 1975 Dollar ROM Costs, $K, for Critical Technology and Ground Test Program 58
Fig 61 Microwave Orbital Test Program 59
Fig 62 Mission Schedule 59
Fig 63 Critical Technology Schedule 60
Fig 64 MPTS Orbital Test Program ROM Cost Summary* (Rough Order of Magnitude in Millions of 1975 Dollars) 60
List of Non-Standard Terms 18

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