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1、ABSTRACTABSTRACT3mm-bandisanimportantbandinmillimeter-waveband,thecenterfrequencyof94GHzatmospheric"window"islocatedwithinthisband.Withthedevelopmentofmoderncommunicationstechnologyandmilitaryelectronictechnology，3mmbandsreceivemoreandmoreattentionoftheresearchers.However,duetot
2、heimpactofdomesticmanufactureechniqueandthehighresearchanddevelopmentcosts,itishardtofinddomesticresearchandreportsofcircuitandsystemsinW-band.Forthisreason,thispapermainlyfocusesontheresearchofW-bandreceiverfront-endanditskeytechnologie.Thispaperputforwardthefinaldesignschemeof
3、the3mmreceiverfront-endbasedonthetheoreticalanalysisofseveralcommonreceivers’structureandtheprevioussuccessfulexperiencesofdesigningthe3mmmodule.Thesubjectrequiresthewholefront-endbemadebytwoparts:thereceivingcircuitandtheprotectiveswitchinfrontofit.Thelocaloscillatorsignalacces
4、sfromtheoutside,sowedon’tneedtodesignthelocalsource.Thefinaldesignoffront-endiscomposedby3mmSPSTswitch、LNA、3mmamplifier、mixerandIFamplifier.Thenthispapermakesadetailedstudyonthe3mmSPSTswitch.Firstly,itanalyzestheprincipleofPINdiode,providesitsequivalentcircuitunderbothpositivean
5、dnegativebias.Secondly,itdiscussesthemajorparameterandmethodstoimprovetheisolationofSPSTswitch.Thirdly,itfinalizesthebasiccircuitconfigurationoftheswitch.Todesignthisswitch,choosethefin-linethathasalowerlossinthemillimeterwavebandasthetransmissionlineandconnectthePINdiodeinparal
6、lel.ThenaccomplishthisdesignbychoosingthePINdiode,confirmingthefin-line’sslitwidth,projectingthetransitionstructurebetweenwaveguidetofin-line,projectingthelow-passfilter,emulatingthewholecircuitandotheraspects.Todealwiththeenergyleakagefromtheslitbetweenwaveguidetofin-line,thefo
7、llowingmethodswastaken:fortheslitofthegroundedside,usingmetalizedthru-holetosuppressenergyleakage;fornon-groundedside,usingthefiltermethodtosuppressenergyleakage.AfterthefabricationoftheSPSTswitch,itwastestedandthemeasurementhasdisplayedthat:between90to95GHz,theswitch’sinsertion
8、lossislessthan1.9dB,andtheinsulationissuperiort
