25-08-2017, 09:32 PM
Wireless Power Transmission
Wireless Power Transmission.ppt (Size: 4.71 MB / Downloads: 113)
Solar Power from Satellites
1968’s idea for Solar Power Satellites proposed by Peter Glaser
Would use microwaves to transmit power to Earth from Solar Powered Satellites
Idea gained momentum during the Oil Crises of 1970’s, but after prices stabilized idea was dropped
US Department of Energy research program 1978-1981
Problems
Issues identified during the DOE study
Complexity—30 years to complete
Size—6.5 miles long by 3.3 miles wide
Transmitting antenna ½ mile in diameter(1 km)
Microwaves
Frequency 2.45 GHz microwave beam
Retro directive beam control capability
Power level is well below international safety standard
Phased-array antenna
The λs for microwaves are small dipoles small
Beam focusing: phased-array antenna
Electronically steered by varying the timing or phase
Waves will merge together
Diffraction analogy
Light same properties
Laser beam shinning trough a narrow opening & spreads out or diffracts
Bright spot in the center w/fainter spots on the side