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Free-space microwave power transmission study, phase 3The results of an investigation of the technology of free-space power transmission by microwave beam are presented. A description of the steps that were taken to increase the overall dc to dc efficiency of microwave power transmission from 15 percent to over 50 percent is given. Included in this overall efficiency were the efficiencies of the dc to microwave conversion, the microwave transmission itself, and the microwave to dc conversion. Improvements in launching the microwave beam with high efficiency by means of a dual mode horn resulted in 95 percent of the output of the microwave generator reaching the receiving area. Emphasis was placed upon successive improvements in reception and rectification of the microwave power, resulting in the design of a rectenna device for this purpose whose efficiency was 75 percent. The procedures and the hardware developed were the basis for tests certified by the Jet Propulsion Laboratory in which an overall dc to dc efficiency of 54 percent was achieved.
Document ID
19760009531
Document Type
Contractor Report (CR)
Authors
Brown, W. C. (Raytheon Co. Waltham, MA, United States)
Date Acquired
September 3, 2013
Publication Date
September 10, 1975
Subject Category
ENERGY PRODUCTION AND CONVERSION
Report/Patent Number
NASA-CR-144151
PT-4601
Funding Number(s)
CONTRACT_GRANT: NAS8-25374
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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