Ariadna Call for Ideas 2011: Innovative Wireless Power Transmission
Type of activity: Standard study (25 k€)
Background and motivation
Wireless power transmission for space – general interest
Wireless power transmission (WPT) is of inherent interest for some space applications and would enable others. However, due to its still relatively low maturity (range, efficiency, specific power etc) its development and application has been limited so far. A non-exhaustive list of such applications of WPT is given below:
From theoretical ideas to state of the art WPT concepts
First theoretically predicted by Maxwell in his “A Treatise on Electricity and Magnetism” in 1873 and later confirmed by Hertz with his experiments on radio waves, wireless power transmission has then been illustrated and strongly advocated in the early 20th century by Nikola Tesla  who wirelessly powered light bulbs in his experiments in 1899 at Colorado Springs , . However, wireless power transmission suffered of lack of interest for the following 40 years. Only with the invention of the magnetron in 1939 , the development of radar during the second World War and the invention of the rectennas in the 1960s, did the industrial and defence interest for wireless microwave power transmission materialised. First experiments, e.g. microwave powered helicopter , led in 1968 to the first engineering proposal for a solar power satellite and subsequent studies with substantial funding during the 1970s. Within that framework, a high power microwave transmission experiment was conducted by Raytheon under the supervision of JPL at the Goldstone facility in 1975, achieving 30kW CW output power over a distance of 1.55km with >80% rectifying efficiency .
Figure 1: Wireless Power Transmission efficiencies flowchart
Research and Study Objectives
In order to enable some of the applications listed above and allow WPT to be competitive with alternatives for some others, substantial, possibly order-of-magnitude improvements to one or more of its key parameters (mass, efficiency, transmission distances (e.g. diffraction limits), power levels) is necessary.
Study proposals should contain
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 Y. Shigeta, Y. Hori, K. Fujimori, K. Tsuruta, S. Nogi, Development of highly efficient transducer for wireless power transmission system by ultrasonic, Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications (IMWS), 2011 IEEE MTT-S International, pp.171-174, 12-13 May 2011
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