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1、AbstractAbstractWiththedepletionofthemicrowavefrequencyresourcesandthedevelopmentofmillimeter-wavebandtechnology,itbecomespossibletodevelophighbandsysteminsatellitecommunicationsystems,wheretheEHFband(millimeter-waveband)isoneofthepreferredfrequencybandsavailable.EHFbandr
2、eferredhereisinrangeof43.5GHz~45.5GHz.EHFbandhasalotofadvantages,suchaslargeavailablebandwidth,smallsizedevices,etc.Manycountries,suchastheUnitedStates,Britainandotherdevelopedcountries,havealreadyhadmatureEHFbandsatellitecommunicationsystems,andthetechnologyofEHFbandhasb
3、eenwidelyapplied.DevelopingtheEHFbandsatellitecommunicationsystemsandimprovingtheperformanceofRFdevicesisoneoftheurgenttasksinChina.ThechoiceofIntermediateFrequencyconversionlink,broadbandlowphasenoiselocaloscillatorandpowercombinernetworkisthekeypointofthestudyandalsothe
4、difficultyofthedesign.Accordingtotheneedoftheproject,theschemesofconversionlinkandpoweramplificationarestudied,andtheschemecomposedofL/S-bandup-converterandEHFbandtransmitterischosen.Meanwhile,thecircuitdesign,circuitimplementationandsystemtestingarediscussed.Especially,t
5、wokeytechnologiescomposedofbroad-bandamplitudeequalizerandbond-wireareanalyed.Inordertoimprovetheamplitude-frequencycharacteristicsofthesystem,thecompensationsolutionofaddingamplitude-equalizenetworkisproposed.Accordingtotheanalysisofequalizer,openmicrostriplinesandvariab
6、leresistorsareappliedtoachievethechangeableamplitudecompensationinS-band.Agoodfinaltestresultisobtained,whichsolvedtheequilibriumproblemofthebroad-bandamplitude.BecauseofthelimitoutputpowerprovidedbytheEHF-bandsingle-chip(maximumP1dBof32dBm),itisnecessarytoemploythepowerc
7、ombiningtechnologytoenhancethepoweroftheamplifiermodule.Inordertoincreasetheoutputpowerofcombiningnetwork,allkindsoffactorsinfluencingcombiningefficiencyarestudiedIII万方数据Abstractandfinallyreducingthelossofbondingwireischosentoimprovethecombiningefficiency.Byincreasingtheq
8、uantityofthebondingwires,wideningthemicrostriplineandchoosingproperlinespace,thelossoffinalpower
