wave propagation in nerworks

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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/MWfrequenciesintospecificcon-ceptblocks.Theseconceptblockscreateagradualapp

4、roachtounderstandinganddesigningRF/MWcircuitsandrepresentspecificrealmsofknowledgethatneedtobemasteredtobecomeanaccomplisheddesigner.BeforewedescribeandanalyzethesetypesofwavesweneedtoconsiderwhyRF/microwavesasasubjecthasbecomesoimportant,thatitisplac

5、edattheforefrontofourmoderntechnology.Furthermore,weneedtoexpandourmindstothemanypossibilitiesthatthesesignalscanprovideforpeacefulpracticesbyexploringvariouscommercialapplicationsusefultomankind.5.1.1AShortHistoryofRFandMicrowavesCirca1864–1873,Jame

6、sClarkMaxwellintegratedtheentiretyofman’sknowledgeofelectricityandmagnetismbyintroducingasetoffourcoherentandself-consistentequa-tionsthatdescribethebehaviorofelectricandmagneticfieldsonaclassicallevel.Thiswasthebeginningofmicrowaveengineering,asprese

7、ntedinatreatisebyMaxwellatIntroductiontoRFandMCandApplicationsthattime.Hepredicted,purelyfromamathematicalstandpointandonatheoretical167168Chapter5IntroductiontoRFandMCandApplicationsbasis,theexistenceofelectromagneticwavepropagationandthatlightwasal

8、soaformofelectromagneticenergy—bothcompletelynewconceptsatthetime.From1885to1887,OliverHeavisidesimplifiedMaxwell’sworkinhispublishedpapers.From1887to1891,aGermanphysicsprofessor,HeinrichHertz,verifiedMax-well’spredictionsexperimentallyanddemonstratedt