The document summarizes wireless power transmission (WPT) via solar power satellites (SPS). SPS would collect solar energy in space and transmit it to Earth as microwaves to large rectifying antennas. SPS could provide a sustainable source of clean energy by harnessing stronger sunlight in space without weather effects. However, SPS remain expensive due to high launch and construction costs of satellites over 6 miles long, requiring further technological advances and support for practical implementation.

2. The inventor of WPT is “Nikola Tesla” he
manage to light 200 lamps at a time from
40 kms at Wardenclyffe in 1890’s.
• World war 2 developed ability convert energy to
microwaves using magnetrons & 1964 William
C.Brown Demonstrated a rectna which could
convert microwaves power to electricity.
In 1968 idea of SPS proposed by “Peter
Glaser”.
• Idea gained momentum during the oil crises of
1970’s but after prices stablizied idea was dropped.

3.  A major problem facing planet Earth is provision of an adequate supply of
clean energy.It has been that we face three simultaneous challenges.
1)Environmental degradation
2)population growth
3)Resource consumption
 Hense, a major task for the new century will be to develop sustainable &
environmentally friendly source of energy.
 Solar power provides a source that is virtually carbon free & sustainable.

4. What is SPS???
Solar Power Satellites would be located in the geosynchronous orbit.
The solar energy collected by an SPS would be converted into electricity,
then into microwaves. where they would be received and converted back into
electricity by a large array of devices known as rectifying antenna or rectenna.
(Rectification is the process by which alternating electrical current ,such as that
induced by a microwave beam , is converted to direct current).
This direct current can then be converted to 50 or 60 Hz alternating current .

5. Why to use SPS ???
There is no air in space so, the satellite would
receive somewhat more intense sunlight
unaffected by weather.
The SPS concept is simpler than most power
system here on the earth
Solar radiation can be more efficiently
collected in space where it is roughly three
times stronger than on the earth & it can be
collected 24 hours per day.
Since there are no clouds or night in high
earth orbit.
SPS does not use up valuable surface area on
the earth.

6. Construction of SPS
Each SPS would have been massive;
measuring 10.5 km long and
5.3 km wide or with an average area of
56 sq.km.
The surface of each satellite would
have been covered with 400 million solar
cells.
The transmitting antenna on the
satellite would have been about 1 km in
diameter
and the receiving antenna on the Earth’s
surface would have been about 10 km in
diameter
The SPS would weight more than
50,000 tons.

7. Rectenna
5,000 MW Receiving Station (Rectenna)
•Microwaves are received with about 85% efficiency
•Around 5km across (3.1 miles)
•95% of the beam will fall on the rectenna

8. Practical Example of SPS
Japan is definitely getting in on the action with its latest spacey plan
– a $21 billion solar-powered generator in the heavens to produce one gigawatt
of energy, or enough to power 294,000 homes.

9. Advantages
Unlimited energy resource
Energy delivered anywhere in the world
Zero fuel cost
Zero Co2 emission
Solar radiation can be more efficiently collected in space
Waste heat is radiated back in to space
No air or water pollution created during the power generation
Concept is simpler than any other most power systems on the Earth.
Space gets full power 24 hours a day
No effect of storms,no cloudy season,no long winter nights

10. Disadvantages
Launch cost
Would require a network of hundreds of satellite
Interfacing with communication satellite
The size of antennas & rectenna
Complexity -long year to complete
Size -6.5 miles long by 3.3 miles wide

11. Conclusion
SPS is still more expensive than ground based solar power & other energy
sources.yet even now,a small SPS system could be economically justified to
provide unavailable emergency power for natural disaster situations.urban
blackout & satellite power failures
For WPT via SPS to become reality require


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Government support
Cheaper Launch prices
Involvement of private sector