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1、PARTIIWAVEPROPAGATIONINNETWORKSCHAPTER5INTRODUCTIONTORADIOFREQUENCYANDMICROWAVECONCEPTSANDAPPLICATIONSCHAPTER6RFELECTRONICSCONCEPTSCHAPTER7FUNDAMENTALCONCEPTSINWAVEPROPAGATIONCHAPTER8CIRCUITREPRESENTATIONSOFTWO-PORTRF/MICROWAVENETWORKSCHAPTER5Introdu
2、ctiontoRadioFrequencyandMicrowaveConceptsandApplications5.1INTRODUCTION5.2REASONSFORUSINGRF/MICROWAVES5.3RF/MICROWAVEAPPLICATIONS5.4RADIOFREQUENCY(RF)WAVES5.5RFANDMICROWAVE(MW)CIRCUITDESIGN5.6THEUNCHANGINGFUNDAMENTALVERSUSTHEEVER-EVOLVINGSTRUCTURE5.7
3、GENERALACTIVE-CIRCUITBLOCKDIAGRAMS5.8SUMMARY5.1INTRODUCTIONThischapterlaysthefoundationforunderstandinghigher-frequencywavephenomenaanddividesthetaskofactivecircuitdesignforRF/MWfrequenciesintospeci?ccon-ceptblocks.Theseconceptblockscreateagradualapp
4、roachtounderstandinganddesigningRF/MWcircuitsandrepresentspeci?crealmsofknowledgethatneedtobemasteredtobecomeanaccomplisheddesigner.BeforewedescribeandanalyzethesetypesofwavesweneedtoconsiderwhyRF/microwavesasasubjecthasbecomesoimportant,thatitisplac
5、edattheforefrontofourmoderntechnology.Furthermore,weneedtoexpandourmindstothemanypossibilitiesthatthesesignalscanprovideforpeacefulpracticesbyexploringvariouscommercialapplicationsusefultomankind.5.1.1AShortHistoryofRFandMicrowavesCirca1864–1873,Jame
6、sClarkMaxwellintegratedtheentiretyofman’sknowledgeofelectricityandmagnetismbyintroducingasetoffourcoherentandself-consistentequa-tionsthatdescribethebehaviorofelectricandmagnetic?eldsonaclassicallevel.Thiswasthebeginningofmicrowaveengineering,asprese
7、ntedinatreatisebyMaxwellatIntroductiontoRFandMCandApplicationsthattime.Hepredicted,purelyfromamathematicalstandpointandonatheoretical167168Chapter5IntroductiontoRFandMCandApplicationsbasis,theexistenceofelectromagneticwavepropagationandthatlightwasal
8、soaformofelectromagneticenergy—bothcompletelynewconceptsatthetime.From1885to1887,OliverHeavisidesimpli?edMaxwell’sworkinhispublishedpapers.From1887to1891,aGermanphysicsprofessor,HeinrichHertz,veri?edMax-well’spredictionsexperimentallyanddemonstratedt
