Wireless power transmission for solar power satellite
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WIRELESS POWER TRANSMISSION FOR SOLAR POWER SATELLITE. OUT LINE. 1.Executive Summary. 2.SPS System. 3.Recent Technologies and research Antenna and Transmitters- Beam Control, Target Detection, Propagation Receivers and Rectifiers 4.Efficiency.

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1.Executive Summary.

2.SPS System.

3.Recent Technologies and research

Antenna and Transmitters-

Beam Control, Target Detection, Propagation

Receivers and Rectifiers


5.Radio Science Influences and Effect of SPS.

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Executive Summary

Difference Between

- Communication System.

- WPT System.

Typical WPT is point – point power transmission.

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Famous taper method.

1.Gaussion Taper.

2.Taylor Distribution.

3.Chebychev Distribution.

suppression of side lobe

To increase the power transmission efficiency.

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Wireless Power Transmission Optionsfor Space Solar Power

  • Far Term Space Systems to beam power to Earth

    • Radio-Wave WPT System

    • Light-Wave Systems

    • In a Light wave system highly concentrated solar radiation would be injected into the laser medium (direct solar pumping) and transmitted to earth and converted to electricity by photovoltaic cell’s.

    • Such system is different from the “classical” SPS using MPT.

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Area of Significant Concern

Intermediate Area

Area of Significant Benefit

WPT Wavelength Trade for SSP

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It consists of mainly three segment.

1. Solar energy collector

2. DC to Microwave converter

3. Large Antenna Array.

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MSC-1A: Lunar and Mars Power (LAMP) ApplicationLaser WPT to Photo-Voltaics on the moon or Mars

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Antennas for Microwave Power Transmission

All antennas can be applied for both the MPT system and communication system

We have to use a phased array antenna for the MPT from/to moving Transmitter/receiver.

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Recent Technologies for Transmitters

Generation of Microwave

Need higher efficient generator/amplifier.

Highly efficient beam collection on rectenna array.

Higher stabilized and accurate phase and

Amplitude of microwave when we use phased

array system for the MPT.

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Microwave Generator/Amplifier option for MPT

1.Microwave Tube (Cooker-type Magnetron)

2.Semiconductor Amplifier.

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Generate and amplify high power microwave (over kW) with a high voltage (over kV) imposed.

Higher Efficiency.

Low cost.

Unstable freq/Uncontrollable phase.

Very Economical.

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Semiconductor Amplifier

It generate low power micro wave with a low voltage

It is easy to control a phase and amplitude

Especially F class amplifier is expected as high efficient amplifier for the MPT system.

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Distinguished from the ordinary use of the microwave technology

Pureness in spectrum

Efficient power generation and high efficient detector in a small and light fashion

Precise beam control

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Recent Technologies of Retro directive Beam Control technology

1.Corner Reflector

2.Van Atta Array

3.Phase conjugate Ckt.

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VAN ATTA ARRAY technology

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There are another method for the target detection is “Software Retro directive”.

Computer is usually used for the software retro directive.

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3. RECEIVERS AND RECTIFIERS “Software Retro directive”.


Rectenna array

Cyclotron Wave Converter

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Schematic Picture of Cyclotron Wave Converter “Software Retro directive”.

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CWCs Developed in Russia “Software Retro directive”.

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EFFICIENCY “Software Retro directive”.

1.RF-DC Conversion Efficiency.

2.Beam Collection Efficiency.

3.DC-RF Conversion Efficiency.

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1. RF-DC Conversion Efficiency “Software Retro directive”..

Efficiency of Rectenna – 80%

Decline of the Efficiency is caused by

-Array connection loss

-Change of connected load

-Trouble of the rectenna

-Any losses on the system(DC/AC conversion, cable)

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(a) Efficiency of 2.4 GHz Rectenna “Software Retro directive”.

(a) Efficiency of 5.8 GHz Rectenna

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2. Beam collection Efficiency “Software Retro directive”.

Beam collection efficiency depends .

- transmitter and receiver aperture areas.

- wavelength, and the separation distance between

the two antennas

Efficiency – 89%

Decline Efficiency caused by



-Amplitude Error on a Phase Array.

The rise of the side lobe decreases antenna gain and beam collection efficiency.

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3. DC-RF conversion Efficiency. “Software Retro directive”.

We do not have to steer a micro-wave beam electrically.

If we need to steer (Guide or control).

We use phase shifter without grating lobes.

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Power loss of the phase shifter is 4-6dB. “Software Retro directive”. - To solve this problem we use low power amplifier after high loss phase shifter without grating lobes.

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Conclusion “Software Retro directive”.

  • Microwave power Transmission is most suitable for a power transmission from moving transmitters to moving target than other transmissions modes.

  • Accurate Target Detection and High efficient Beam forming By Retro directive system for Solar Power Satellite.

  • Compatible with other radio services and Application.

  • Power transmission efficiency of WPT is higher than that other mode in reference to.

    • Higher efficient generator amplifier

    • Highly efficient beam collection rectenna array

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Caution Note “Software Retro directive”.

  • Microwave Power Transmission is Effected on Human Health.

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THANK YOU “Software Retro directive”.