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1、StartupBeamsWirelessPowertoChargeDevicesByBryanGardinerCordsandcableshavebeenarealityforconsumerdevicessincetheadventofhomeelectronics.Thatrealitymaybechangingverysoon,however,asanumberofcompaniescontinuetomakeinroadsintoeliminatingthewiresthatkeepourgadgetstetheredtoawall一andtoonean
2、other.Powercast,anewPennsylvania-basedstartupsaysitssolutionforwirelesspowerharvestingisnotonlyreliable,FCC-approved,andsafe,butisalsoreadytodebutinmillionsofsmalldevicesbytheendof2008,accordingtoJohnShearer,Powercast'sfounderandchiefexecutive.Thetechnology?Radiowaves,thesametechnolo
3、gydrivingcellularphonesandyourFMdial.Whetheritsthepromiseofshort-rangewirelesstechnologieslikeultrawideband(UWB),wirelessUSB,andthewirelesshigh-definitioninterface(WHDI)thattransmitdatafromonedevicetoanother,ormethodsforsupplyingthosedeviceswithpower,suchasinduction—ornow,RF~thefutur
4、ehomelookstobeincreasinglycordless."Basically,wevedevelopedachiponthetransceiverandreceiversidethatefficientlytransmitsRFenergy/saidKeithKressin,executivevicepresidentofsalesandmarketingforPowercast.WhileKressinadmitsthatusingRFenergytopowerelectronicdevicesisn'taparticularlynewidea,
5、hesayshiscompany'spatentedapproachisuniqueinthatitcanharvestmuchmoreofthatenergy(50-70percent)thantraditionalmethods,typically10percent,accordingtothecompany.It'sextremePCpower:readaboutThermalTake'sl・2・kWpowersupply.Becauseradiowavesareinfactenergy,theyarealreadyusedtosendandreceive
6、cellphone,television,radio,andWi-Fisignalseveryday,heexplained.Thosewavesspreadoutinalldirectionsuntiltheyreachanantennathatistunedtotheappropriatefrequency.Powercast^wirelesspowerplatformusesaHPowercasterntransmittercircuitrunningonconventionalcurrenttobroadcastalow-powerradiosignal
7、atapredeterminedfrequency.ThesmallernPowerharvesternreceivercircuit一whichcanbeembeddedinanylow-powerdevice一thenusesthatenergytorechargeorcanevenreplacethedevice'sbattery,accordingtoKressin.ThePowercastsolutionisabletomaximizepowertransferbyusingamuchbroaderareaoftheRFspectrum,the900-
8、MHzband・Whil
