Solar Power

There are assorted beginnings of energy. We use heat energy obtained by the firing fuels like wood, coal, kerosine or cookery gas for cooking our nutrient.The energy fuels like gasoline and Diesel is used to run auto, coachs, trucks and train. Diesel is besides used to supply energy to run the pump for irrigation in agribusiness. Electrical energy is used for illuming the bulbs, tubings and to run wireless, telecasting, family contraptions, electric trains etc. Solar energy is besides used for cooking the nutrient, illuming the bulbs etc. In fact all over activities use energy in one signifier or the other. Energy is indispensable for our endurance in this universe

The energy obtained from the Sun is known as solar energy. Sun is the beginning of energy. The Sun radiate more energy in one second than the people have used the since the beginning of the life. the energy radiated by the Sun comers from the Sun. the H atom in Sun ; s nucleus combine to organize one He atom. but the mass of He atom is less the four H atoms. It means mass has lost during the atomic merger.This lost mass is emitted as beaming energy. The solar energy takes merely 8 proceedingss to go the 93 million stat mis to the Earth. Solar energy travels with the velocity of visible radiation.

This heat and light energy is radiated by Sun in all waies in the signifier of energy. The Sun has been radiating an tremendous sum of energy at the present rate for about 5 billion Old ages and will go on radiating energy at that rate for about five billion old ages more. Since Sun is really far from the Earth merely little fractions of energy radiated by the Sun reaches the outer bed of Earth ‘s ambiance. A little less than half of solar energy which falls on the fringe of the ambiance really reaches the surface of Earth.

The solar energy which reaches the Earth is absorbed by land, H2O organic structures and workss. The solar energy trapped by the land and H2O organic structures causes many phenomena in nature like air currents, storms, rain, snowfall and sea moving ridges etc. Plants utilize the solar energy to fix the nutrient by the procedure of photosynthesis.

History OF SOLAR ENERGY:

As early in the seventh century B.C, people use amplifying glass to concentrate the visible radiation of Sun into beams so they would do wood to catch fire.

Many of hundred old ages ago a scientist used heat from a solar aggregator to do a watercourse to drive watercourse engine. Solar boilers are invented by Charles Greely Abbott an American astrophysicist, in 1936. The solar H2O warmer gained popularity at the same clip in Florida, California and Southwest. Today people use heat energy to heat edifices and H2O to bring forth electricity.

[ 3 ] SOLAR CONSTANT:

The sum of energy received per second by one square metre country near the Earth infinite at an mean distance between the Sun and Earth is called solar constant.The energy near the Earth recieves from the Sun is about 1.4 kilojoules persecond persquare metre and this measure is known as solar constant.The mean distance between the Sun and Earth is astronomical unit ( 1.495*1011m ) . The solar invariable is represented as Ion.

[ 4 ] SOLAR COLLECTERS:

Capturing the solar energy and putiing in usage a hard work, because Sun does non direct a big sum of energy at one topographic point. The energy emitted by Sun at one topographic point depends upon certain conditions like the clip of the twenty-four hours, season, latitude of country and the clarity or cloudness of the sky.A solar aggregator is the manner roll uping the heat from the Sun. Devicess for capturing the Sun ‘s energy over a big country and concentrating it on a little country, thereby concentrating it. In this manner it can be made to supply highly high temperatures, used to bring forth steam that will used to transport out a chemical reaction to bring forth a portable fuel such as H. Solar aggregators may be curved dishes.

Solar aggregator allows the sunshine in through the glass or plastic and the Sun visible radiation is changed into the heat energy. A really good illustration of solar aggregator is a auto standing in sunshine. On cheery twenty-four hours, a closed auto becomes a solar aggregator. Light energy base on ballss through the window glass and absorbed by the auto ‘s inside and converted into the heat energy. The auto ‘s spectacless do non let the light come out. That ‘s why green house stay warm around a twelvemonth.

[ 5 ]

[ 5 ] PHOTOVOLTAIC CELL ( SOLAR CELL ) :

A photovoltaic cell is a device which converts the sunlight energy ( solar energy ) into electrical energy.these are besides known as solar cell or PV.

The photovoltaic word has come from exposure agencies light and galvanic means a measurment of electricity.

A individual solar cell can bring forth merely a little sum of electricity. To acquire a more electrical power a group of many cells joined together. The group of solar cell is known as solar panel or solar cell panel. Photovoltaic ‘s have long had many applications, such as PV-powered orbiters, tickers, and reckoners. The launch of Vanguard 1 in 1958, PV engineering is the energy beginning of pick for such extraterrestrial applications, orbiters and infinite investigations.

[ 1 ] SOLAR Cookers:

The solar cooker is the device is used to cook the nutrient by using the heat energy radiant by the Sun. It uses sunlight as beginning of energy. A box type solar cooker can be used to cook merely those nutrient stuffs which require slow warming. It can non be used for those stuffs which require high warming. For illustration it can non be used for baking and frying. It is used to cook the nutrient stuffs like rice, pulsations and veggies. The high temperature can be produced with the aid of concave mirror reflector.

[ 6 ]

[ 7 ] SOLAR SPACE Heating:

It means heating the infinite inside a edifice. Today many places use solar energy for infinite warming. There are two general types of solar infinite heating systems:

Passive Solar Heating

Active Solar Heating

Passive Solar Heating:

In inactive solar warming, the edifice itself serves as a aggregator of solar thermic energy. Greenhouses made of glass or other crystalline stuffs are possibly the most good know application of inactive solar. A inactive solar house does non utilize any particular mechanical equipment to reassign the heat that the house collects on cheery yearss. A inactive solar place Acts of the Apostless as closed auto does. Sunlight passes through a place ‘s Windowss and is absorbed in the walls and floors of the houses.

Active solar Heating:

When solar energy is non plenty an active solar place uses mechanical equipment, such as pumps and an outside beginning of energy to assist heat the house

Active systems use particular solar aggregators that look like boxes covered with glass. Dark-colored metal home bases inside the boxes absorb the sunshine and alteration it into heat.

Solar concentrating mirror dishes

CHALLENGES AND ECONOMICS:

A A A The chief challenge confronting solar energy is that the Sun shines merely during the twenty-four hours or we can utilize solar energy merely in the presence of Sun. Summer is the clip of least energy demand for Alaskans, although this is besides the clip of twelvemonth with daytime. On norm, the sunniest parts of Alaska receive less than half of the sum of the entire solar energy throughout the twelvemonth. It is really less as compared the sunniest topographic points in the southwesterly US. Besides, large-scale storage methods for solar energy are non available today. Electric storage batteries are able to hive away merely little sums of electricity.A PV faculties typically produce the most power during the portion of twenty-four hours with the highest electricity demand, and PV-produced electricity remains really expensive compared to other beginnings of electricity. For most place applications, PV systems besides require expensive battery and AC inverters.

A A A Solar thermal energy could be cost effectual for peculiarly in passive-solar designed places. For place installings, there are a limited sum of qualified commercial installers of solar energy equipment. A The on the job life-time of a PV faculty is around 40 old ages, the energy payback clip of such a faculty is anyplace from 1 to 30 old ages, and normally under five, depending on the type and the sum of Sun where it is used. This means that PV panels can be net energy manufacturers, and can “ reproduce ” themselves up to more than 30 times over their life-time.

[ 8 ] ADVANTAGE OF SOLAR ENERGY:

1. Renewable Beginning of Energy:

Solar energy is a renewable resource of energy. It can non be utilized at dark or on nebulose yearss, its handiness may be by and large relied upon twenty-four hours after twenty-four hours. The solar energy supply will last every bit long as the Sun.

2.Non Polluting Soruce

Solar energy is non-polluting beginning of energy. It does non foul our air by let go ofing C dioxide, N oxide, sulfur dioxide into the ambiance like many traditional signifiers of electrical coevalss does.

3.Saves Money:

The energy from the Sun is free. Solar energy does non necessitate any fuel. It reduces the electricity measure. The usage of solar energy indirectly reduces wellness costs. The supply of solar energy is non affected by demand of fuel. It is the inexpensive beginning of energy. The nest eggs are immediate and for many old ages to come.

4. Environmentally Friendly:

Solar Energy is clean, renewable and sustainable, assisting to protect our environment. It does non foul our air by let go ofing C dioxide, N oxide, sulfur dioxide or quicksilver into the ambiance like many traditional signifiers of electrical coevalss does. It is non responsible for planetary heating, acerb rain or smog. It contributes to the lessening of harmful green house gas emanations.

5. The Need of No or Low Care:

Solar Energy systems are maintenance free and will last for decennaries. Solar energy systems operate mutely, have no moving parts, do non let go of violative odors and do non necessitate you to add any fuel. We can acquire easy more solar panels in the hereafter.

6. Solar cells have a long life period.

7. It is used for cooking the nutrient saves cherished fuels like coal, kerosine and LPG. When nutrient is cooked in cooker in the presence of sunshine its foods do non acquire destroyed.

Disadvantage OF SOLAR ENERGY:

Besides such of import advantages, there are a few drawbacks of solar energy every bit good.

The chief disadvantage is the cost of put ining a solar energy system, mostly because of the high cost of the semi-conducting stuffs used in constructing one.

The most obvious one is that solar power can non be created at dark due to the absence of Sun.

The engineering progresses bing system could dawdle behind and there is demand to recycle the PV.

The installing of solar power equipments such as cells/panels is really expensive.

It is a weak energy beginning as compared to fossil fuels.

REFRENCES:

[ 1 ] Pyhsics by Lakhmir Singh, Manjit Kaur

[ 2 ] hypertext transfer protocol: //www.energyquest.ca.gov/story/chapter15.html

[ 3 ] SOLAR ENERGY by HP GARG

[ 4 ] hypertext transfer protocol: //www.science.org.au/nova/005/005glo.htm

[ 5 ] hypertext transfer protocol: //www.need.org/needpdf/infobook_activities/SecInfo/SolarS.pdf

[ 6 ] ecell.k12.hi.us/ … /solar_cookers.htm

[ 7 ] hypertext transfer protocol: //lsa.colorado.edu/summarystreet/texts/solar.html

[ 8 ] hypertext transfer protocol: //ecofuture.net/solarpanels/2009/08/17/advantages-and-disadvantages-of-solar-power-for-home.html

hypertext transfer protocol: //www.solarhome.org/infoadvantagesofsolarenergy.html

Abstract- The chief beginning of the energy in our life comes from fossil fuels, which is a non-renewable resource moreover it produces high sum of CO2. One of the solutions to planetary energy crises is development of geosynchronous orbit solar power orbiters ( SPS ) .It provides a clean and efficient beginning of energy by roll uping the solar power from infinite and so transporting it to the Earth. This is a new beginning of clean energy. Space solar power can work out our energy and nursery gas emanations jobs. Space solar power can supply big measures of energy to each and every individual on Earth with really small environmental impact. The clip mean power per unit country in infinite is 5-10 times larger than that on the land, while the power loss for the radio power transmission/reception is expected less than 50 % .This paper provides a reappraisal on the presently formulated engineerings like microwave power transmittal, laser power transmittal and the intercrossed power transmittal systems for transmittal of solar power to the Earth from SPS. It besides talks about the effects on human wellness and environment due to SPS. Finally the paper suggests the development of a bread board modelA for microwaveA radio power transmittal ( WPT ) . The intents of utilizing this bread board theoretical account is to obtain a precise directional control of WPTA technologyA , which includes the direct sensing of rectenna sites, and the microwave beam control accomplishment with high angular preciseness, and to clear up the extension features of the microwaveA powerA in the ionosphere.

KEYWORDS – Microwave, Solar power orbiter, wireless power transmittal.

I. Introduction

Energy and environment are one of the most of import planetary issues which have to be resolved to prolong our society. 80 % of energy in our life comes by using fossil fuels. If we continue to utilize the dodo fuel resources at the current ingestion rate, they will be wholly over within 100-150 old ages. Furthermore, the immense sum of ingestion of fossil fuel additions CO2 concentrations in the ambiance, which raises serious environmental issues. If we continue to depend on the dodo fuel, we will see significant debasement of life quality within this century. The emanation of green house gases besides leads to a figure of wellness jobs. Another beginning of energy is from atomic power, but the job of this beginning is the waste disposal factors. The energy ingestion graph is shown in fig 1 [ 6 ] . The planetary issues in the closed Earth system will be efficaciously solved by a paradigm displacement to the unfastened earth- infinite system. The life clip of Sun is estimated as 4-5 billion old ages. There is limitless changeless solar energy supply in infinite free from conditions conditions, rather different from that on the Earth, therefore we can see solar power orbiter as a long term beginning of energy.

The construct of the SPS is to tap the solar energy utilizing a large-scale photovoltaic array in infinite and to convey it to the land utilizing optical maser beam or micro-cook as shown in fig.2 [ 6 ] . It has a great potency for a large-scale energy system to replace the dodo fuel workss. The clip mean power per unit country in infinite is 5-10 times larger than that on the land, while the power loss for the radio power transmittal and response is expected to be less than 50 % . Hence SPS has a competitory advantage over the solar power workss on the land.

Solar power orbiter has the capacity to supply about all the electrical demands of our planet. Furthermore it is green beginning of energy, it does non breathe any unsafe green house gases, and it will non bring forth any risky wastes excessively, it will supply power 24 hours a twenty-four hours 7 yearss a hebdomad in immense measures and it works irrespective of cloud screen, daylight or weave velocity. But it requires heavy developmental cost.

The SPS was foremost brought up by Peter Glaser in 1968, followed by NASA/DOE surveies in the 1970 ‘s. Since the early probes, different types of the SPS have been proposed, more than 30 in the universe. Most of the SPS theoretical accounts proposed so far uses microwave instead than optical maser for the radio power transmittal, because the power, efficiency both at the sender and receiving system is by and large higher and fading through the ambiance is lower for microwave as seen with that of optical maser.

II. MICROWAVE POWER TRASMISSION FOR SPS

Microwave frequence for SPS has been selected in a scope of 1-10 GHz, compromising between atmospheric fading and antenna size. Fig.3 [ 5 ] illustrates the constellation of infinite solar power systems dwelling of SPS and associated land sections. If we choose a frequence in the industrial, scientific and medical ( ISM ) wireless sets, 2.45 or 5.8 GHz are the possible campaigner. 2.45 GHz was selected in the early stage survey, but 5.8 GHz has been late chosen as a more desirable frequence due to recent accelerated advancement in C-band RF engineering. The microwave power transmittal system has the undermentioned map, i.e.

1 ) First the transition of direct power from photovoltaic cell to micro-cook power.

2 ) Followed by the formation and control of microwave beam aimed to fixed location in

Earth.

3 ) Last roll uping the microwave energy and change overing it into electrical energy on the

Earth surface.

Therefore the microwave WPT system consists of a sender ( in infinite ) , beam control mechanism and having aerial system ( on the Earth ) . As for the microwave generator, tubings such as magnetron, klystron, and TWT have been proposed for the SPS usage because the power transition efficiency is well high more than 70 % at low cost.

Semiconductor amplifier is another possible campaigner as the power efficiency has been moderately improved to 60-70 % with low cost outlook. Besides the power efficiency, beam indicating engineerings to convey the microwave power beam exactly to the receiving locations are indispensable for the power transmittal. They are curious to the radio power transmittal, non covered by the bing communicating engineerings. A beam angle 100 I?rad with a 10 I?rad indicating truth is required for the 5.8 GHz transmittal from an aerial of 2 kilometers square in the geosynchronous orbit to a response site of 3.5 kilometers diameter on the land. The conveying aerial will be assembled by a figure of array aerial panels which consist of sub-array aerials. Wholly more than 1 billion aerials will be installed as in Fig.4 [ 6 ] .

A retro-directive engineering with a pilot signal from the land will be used to command the microwave beam from each aerial panel directing to the land station. Although each panel is sufficiently stiff for microwave beaming, comparative gesture between the panels can non be avoided for the big aerial assembly. In order to organize a microwave beam exactly focused at the land station, the stage of microwave from each panel needs to be adjusted between the panels, which requires radical new engineerings. In the absence of the pilot signal, sender will automatically diphase its power beam and the peak power denseness lessenings by the ratio of the transmission elements. Still small spot of energy is lost due to side lobes which are caused by diffraction. To avoid this loss we have to do having aerial of really big size to suit the side lobes, which is practically non possible.

The microwave power at the having site is rectified to supply dc power utilizing arrays of rectifying aerial ( rectenna ) as shown in Fig.5 [ 6 ] with Schottky rectifying tube. The power transition efficiency for individual rectenna exceeds 80 % in a power scope more than 50 mW. However, farther research is required to better the power efficiency for 1 mW category input and rectenna array as a whole. We use Schottky rectifying tube since it has lowest electromotive force bead and highest velocity of operation, hence waste least sum of power due to conductivity and shift. Presentation of microwave power transmittal towards SPS on land and on a little orbiter or on the International Space Station.

III. LASER WIRELESS POWER TRANSMISSION

Satellite and system architectures based on optical maser radio power transmittal were foremost considered earnestly during the SPS Exploratory Research and Technology ( SERT ) plan [ 6 ] . Laser systems have one major advantage for power transmittal which is the aperture aggregation efficiency. Whereas microwave power transmission and receiving aerials are sized in kilometres, laser systems can be sized in metres. A secondary advantage is that optical maser based systems lend themselves more readily to incremental developments than microwave based systems. However, the major hurdle that optical masers based systems face is atmospheric losingss particularly due to the rain fading. To supply uninterrupted power, which would be necessary to measure up SPS as base burden power coevals, the optical maser system would either hold to hold monolithic land energy storage capableness or multiple sites located sufficiently far apart such that one of the sites would be available at all times.

With the lower delivered power per site design standards of the current surveies compared to the DOE/NASA mention system, beam safety has minimum influence on the design of a microwave based solar power orbiter system, nevertheless, it has been a major factor for optical maser based systems. To cover with optical maser oculus and skin exposure bounds, a system of geostationary bunch of optical maser orbiters are distributed uniformly through a sufficient solid angle of infinite, with the beams from the orbiters spread uniformly over the 600m diameter photovoltaic array having site. With such a system, it is possible to keep safety criterions and still present IR visible radiation ( 1.03I?m, 1.06I?m ) with a septuple addition in power denseness over natural sunshine. Practical realisation of such a system is through a HALO orbit in which the orbiters appear to travel in a round orbit about a fixed point in infinite. Individual orbiters would hold multiple solid-state optical masers powered by photovoltaic arrays.

Lasers are dispersed among photovoltaic cells to minimise power direction. Light is beamed straight to the Earth or collected by mirrors or through fiber optics to a cardinal guidance mirror and so beamed to the Earth. A fresh attack to get the better ofing weather break of optical maser based power beaming is to utilize the beamed power to hive away energy at the having site for ulterior transit. A low-earth-orbit ( LEO ) orbiter would utilize a concentrator Federal solar. Integrated Symmetric Concentrator with concentrator mirrors, photovoltaic arrays and microwave sender phonograph record ( 500m in diameter ) pumped laser to present 10MW of optical maser energy focused into a armored combat vehicle of saltwater incorporating Ti dioxide as a accelerator to divide the H2O into its constituent H and O. Hydrogen can be used as fuel or it can be reacted with CO2 to do methane [ 1 ] .

IV. HYBRID LASER-MICROWAVE WIRELESS POWER TRANSMISSION

Laser and micro-cook wireless power transmittal each have alone advantages, i.e. , optical masers require smaller apertures and microwaves are about immune to rain and other atmospheric conditions. Proposals are made to unite the two options such that each would run in its most advantageous environment. The key to the design proposal is a platform operating in the stratosphere at about 20km tallness. Lasers can be used to beam power from orbiters at geostationary orbit through infinite ( no atmospheric fading ) to a photovoltaic array on the platform. The power would so be retransmitted with microwaves from the platform to a land rectenna. This would minimise both the size of the orbiter sender and land receiving system for an all-weather transmittal system. Drawbacks to such a system include efficiency losingss due to the conversion/retransmission measure and the likeliness of transcending microwave beam power denseness safety criterions. Fig. 6 [ 1 ] depicts the schematic of SPS.

V. ENVIRONMENTAL AND HEALTH CONCERNS

An appraisal of the SERT Program by the US National Research Council [ 5 ] has recommended more accent and enlargement of its environmental, wellness, and safety attempts, in order to reexamine the environmental, wellness, and safety jeopardies of the design. It is besides necessary to analyze the biological deductions of SPS-WPT. To guarantee environmental wellness and safety, the SERT Program has limited the “ center-of-beam ” power densenesss to the scope of 100-200W/m2

( 10-20 mW/cm2 ) for both microwave and seeable light transmittal. For WPT, the microwave power denseness is projected to be 1.0 W/m2 ( 0.1 mW/cm2 ) at the margin of the rectenna.

The ANSI/IEEE criterion [ 6 ] for maximal allowable human exposure to micro-cook radiation at 2.45 GHz is 81.6 W/m2 ( 8.16 mW/cm2 ) averaged over six min and 16.3 W/m2 ( 1.63 mW/cm2 ) averaged over 30 min, severally, for controlled and uncontrolled environments. The controlled and uncontrolled state of affairss are distinguished by whether the exposure takes topographic point with or without cognition of the exposed person and is usually interpreted to intend persons who are occupationally exposed to the microwave radiation, as contrasted with the general populace. Clearly, beyond the margin of the rectenna, the possible exposure, for either the CERT or Reference System, would be good below that presently allowable to the general populace. The SPS-WPT system, proposed by Japan ‘s METI, will be designed to hold a land degree microwave power denseness lower than those emitted by cellular nomadic telephones. Cellular telephones operate with power densenesss at or below the ANSI/IEEE exposure criterions [ 7 ] . Thus, public exposure to the SPS-WPT Fieldss would besides be below bing safety guidelines.

At the centre of the microwave beam, power densenesss would be greater than the allowable degree of exposure for controlled state of affairss. Except for care forces, human exposure would usually non be allowed at this location. In the instance of occupationally required presence, protective steps, such as spectacless, baseball mitts, and garments, might be used to cut down the exposure to a allowable degree. However, above the rectenna, where the power denseness is about 250 W/m2 ( 25 mW/cm2 ) , research in support of the Reference System has found that some birds exhibit grounds of sensing of microwave radiation. This suggests that migratory birds, winging above the rectenna, might endure break in their flying waies. Furthermore, at higher ambient temperatures, larger birds seem to see more heat emphasis than smaller 1s, during 30 min of exposure [ 5 ] .This extra heat, from micro-cook energy deposited inside their organic structure, will emphasize their thermic regulative capacity.

VI. BREAD BOARD MODEL AND FUTURE SCOPE OF COMMERCIAL SPS

The staff of life board theoretical account is formed by a thin panel construction with a thickness of 6 centimeter, and the panel consists of aA transmittal aerial bed, microwave elaboration bed and thermic radiation bed, severally. Performances of the bread board were measured and evaluated. Additionally, the microwave beam maneuvering experiments by the package retro-directive method were demonstrated. A Performances of the bread board were measured and evaluated. Thermal transeunt features of the bread board theoretical account were simulated.

A engineering roadmap from research stage to commercial stage is shown in Fig.7 [ 5 ] . Based on the consequences from the small-scale presentation experiments in infinite, together with the consequences from the land experiments, we will do a determination on the engineering option, microwave or laser, for the radio power transmittal. With the selected transmittal medium, we will do a 100 kW-class SPS presentation experiment in orbit before 2020. All basic engineerings required for the commercial SPS will be verified at this phase. This attack is in conformity with the basic program on infinite development by the authorities ‘s infinite development scheme headquarter in Japan. After completion of these presentations Japan will choose a constellation for the initial mark of the commercial SPS. The expected power cost depending to a great extent on the development of infinite transit and public credence will be the major trade off factors for choice. For the selected constellation, 2 MW and 200 MW category works will be constructed and tested before 2030. This scenario guaranties the start of building of the 1 GW category commercial SPS in 2030 ‘s.

VII. Decision

One of the most critical engineerings for the SPS is microwave power transmittal from the geosynchronous orbit to the land. Evolutionary microwave engineerings are required for high power transition efficiency more than 80 % from/to DC and an highly high-precise beam control with 10 I?rad truth. These engineerings will be partly verified in the land presentation experiment within several old ages and will be to the full verified in the infinite experiments within 10 old ages. Although the needed engineerings are rather ambitious, go oning research activities along with the proposed roadmap will take to opening the new SPS epoch in 2030 ‘s.

VIII. Reference

[ 1 ] C.A. Schafer, D. Gray 16 May 2012, “ Transmission media appropriate laser-microwave solar power orbiter system ” 61st IAC, Prague.

[ 2 ] J.C. Lin, 1997 “ Biological facets of nomadic communicating Fieldss, ” Wireless Networks, vol. 3, pp. 439-453

[ 3 ] National Research Council, 2001, “ Puting the foundation for infinite solar power ” : An appraisal of NASA ‘s infinite solar power investing scheme, Washington DC

[ 4 ] P.E.Glaser, 1968, “ Power from the Sun: Its Future ” , Science, vol.162, pp.867-886.

[ 5 ] Susumu Sasaki, Koji Tanaka, 2011, “ Wireless Power Transmission Technologies for Solar Power Satellite ” , International communicating conference IEEE.

[ 6 ] S.Sasaki, K.Tanaka and Advanced Mission Research Group, Sep.-Oct. 2010, “ SSPS Technologies Demonstration in Space ” , IAC-10.C3.4.1, 61st International Astronautical Congress, Prague.

[ 7 ] S.Sheik Mohammed, K. Ramasamy, T. Shanmuganantham, 2010, “ Wireless Power Transmission – A Following Generation Power Transmission System ” IEEE International Journal of Computer Applications

[ 8 ] Timothy J.Wickenheiser “ The Interagency Advanced Power Group ” , Available at: & lt ; hypertext transfer protocol: //iapg.grc.nasa.gov/iapg/ & gt ; [ Accessed on 30 Dec 2012 ]

[ 9 ] The Institute of Electrical and Electronics Engineers, Inc. 8 Dec 1998, “ Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields 3 kilohertz to 300 GHz ” , IEEE std C95.1 1999 edition