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 IV - Sections 9 through 14 with Appendices 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. 11. Contract or Grant No. NAS 3-17835 13. Type of Report and Period Covered o Contractor Report 14. Sponsoring Agency Code 9. Performing Organization Name and Address Raytheon Company Equipment Division 528 Boston Post Road Sudbury, Massachusetts 01776 12. Sponsoring Agency Name and Address National Aeronautics and Space Administration Washington, D. C. 20546 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 Applications1 joint Lewis Research Center/Jet Propulsion Laboratory five-year program to demonstrate the feasibility of power transmission from geosynchronous orbit. This volume (4 of 4) is comprised of Sections 9 through 14 which present receiving antenna, frequency interference and allocation, risk assessment, system analysis and evaluation, critical technology and ground test program, critical technology and orbital test program. Section 9 reviews and discusses the microwave rectifier technology, approaches to the receiving antenna, topology of rectenna circuits, assembly and construction, with ROM cost estimates. It includes analyses and coot estimates for the equipment required to transmit the ground power to an external user. Section IC m -o.sents the analyses and discussion associated with radio frequency inter fei and allocation. Noise and harmonic considerations are presented for both the amplitron and klystron. Interference limits are identified and evaluated. Section 11 presents the risk assessment discussion wherein technology risks are rated and ranked with regard to their importance in impacting the microwave power transmission system. Section 12 presents the system analyses and evaluation of parametric studies of system relationships pertaining to geometry, materials, specific cost, specific weight, efficiency, converter packing, frequency selection, power distribution, power density, power output magnitude, power source, transportation and assembly. Capital costs per kW and energy costs as a function of rate of return, power source and transportation costs as well as build cycle time are presented. Appendices include estimated annual operations and maintenance cost for 5 and 10 GW systems, systems analysis examples and format for the readers use. Section 13 presents the critical technology and ground test program including objectives, configurations, definition of test Phases I through III and critical technology development with ROM costs and schedule. Section 14 presents the orbital test program with associated critical technology and ground based program based on full implementation of the defined objectives. ROM costs and schedule estimates are included. An appendix is included which provides further detail of the ground and orbital test programs such that the reader may readily modify configurations as studies and technology developments mature leading to modification of the driving objectives. 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 Classif. (of this report) Unclassified 20. Security Classif. (of this page) Unclassified 21. No. of Pages 234 22. Price* $3. 00
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