1. Report No. NASA CR-134886 2. Government Accession No. 3. Recipient's Catalog No. 4. Title and Subtitle MICROWAVE POWER TRANSMISSION SYSTEM STUDIES Volume II - Introduction, Organization, Environmental and Space- borne Systems Analysis (Sections 1 through 7) 5. Report Date December 1975 6. Performing Organization Code 7. Author(s) O. E. Maynard, W.C. Brown, A. Edwards, J. T. Haley, G. Meltz, J. M. Howell - Raytheon Co. ; A. Nathan - Grumman Aerospace Corp. 8. Performing Organization Report No. ER75-4368 10. Work Unit No. 9. Performing Organization Name and Address Raytheon Company Equipment Division 528 Boston Post Road Sudbury, Massachusetts 01776 11. Contract or Grant No. NAS 3-17835 13. Type of Report and Period Covered Contractor Report 12. Sponsoring Agency Name and Address National Aeronautics and Space Administration Washington, D. C. 20546 14. Sponsoring Agency Code 15. Supplementary Notes Mr. Richard M. Schuh NASA Lewis Research Center Cleveland, Ohio 44135 16. Abstract -- A study of microwave power generation, transmission, reception and control was conducted as a part of the NASA Office of Applications’ joint Lewis Research Center/Jet Propulsion Laboratory five-year program to demonstrate feasibility of power transmission from geosynchronous orbit. This volume (2 of 4) is comprised of Sections 1 through 7 which present introduction, organization, analyses, conclusions and recommendations for each of the spaceborne subsystems. Section 1 presents the Introduction, task definitions, conclusions and recommendations, with discussion of the associated subsystems technologies. It is concluded with a discussion of the report approach and organization. Section 2 presents the organization and approach to the study. Section 3 presents the environmental effects - propagation analyses with appendices covering radio wave diffraction by random ionospheric irregularities, self-focusing plasma instabilities and ohmic heating of the D-region. Section 4 presents the analyses of de to rf conversion subsystems and system considerations for both the amplitron and the klystron with appendices for the klystron covering cavity circuit calculations, output power of the solenoid-focused klystron, thermal control system, and confined flow focusing of a relativistic beam. Section 5 presents the photovoltaic power source characteristics as they apply to interfacing with the power distribution flow paths, magnetic field interaction, de to rf converter protection, power distribution including estimates for the power budget, weights and costs. Section 6 presents analyses for the transmitting anteir considering aperture illumination and size, with associated efficiencies and ground power distributions. Analyses of subarray types and dimensions, attitude error, flatness, phase error, subarray layout, frequency tolerance, attenuation, waveguide dimensional tolerances, mechanical including thermal considerations are included. Implications associated with transportation, assembly and packaging, attitude control and alignment are discussed. Section 7 presents analyses for the phase front control subsystem, including both ground based pilot signal driven adaptive and ground command approaches with their associated phase errors. 17. Key Words (Suggested by Author (s)) Microwave power transmission; power from space; satellite power transmission; phased array power transmission; rectifying antenna (rectenna). 18. Distribution Statement Unclassified - Unlimited 19. Security Oassif. (of this report) Unclassified 20. Security Classif. (of this page) Unclassified 21. No. of Pages 26J 22. Price* $3. 00
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