Abstract: MicrowavepowertransmissionservedasthecoretechnologyoftheSpaceSolarPowerSatellite（SSPS）wasstudied.Therectifyingsurfacewasresearchedbasedontheconceptofperfectlymatchedlayertosolvetheproblemthatbeamcollectionefficiencywoulddeclinewithdistanceawayfromtransmittingantennabecauseofthespreadofbeam，bychangingperfectlymatchedlayerstructureconjugatematchbetweenantennaoutputimpedanceandrectifiercircuitinputimpedance.Therectifyingsurfaceexhibitsastrongrestraintohighorderharmonics，withouttheneedofRFfilterwhichisanimportantelementforthetraditionalrectenna，sothecircuitstructureissimpleandhighconversionefficiencyenergycanberealized.Andundertheproposedlimitforthecenter-of-beampowerdensitytoassureenvironmentalhealthandsafetyformicrowavetransmission，anexperimentalsystemwithsolidpoweramplifierat5.8GHzwasconstructedandtested，andthemaximumconversionefficiencyis57.7%.TheexperimentresultsshowthatthedesignedmicrowavepowertransmissionsystemisbenefitforgrounddemonstrationtestinginminiatureversionandbuildingofSSPSinfuture.

Key words: SpaceSolarPowerSatellite, microwavepowertransmission, antenna, perfectlymatchedlayer, rectifier, centerofbeam, powerdensitiy