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1、Module1:Introduction1.0IntroductionThewidespreaduseofsmall,highspeedelectronicdeviceswhichareoftenoperatednearotherelectricalsystems,aswellastheexplosioninthenumberandvarietyofwirelesscommunicationdevicesavailable,hasresultedinconcernaboutinterferenceeffects.Fasterandmo
2、recomplexcircuitsarebeingcrowdedintoeversmallerspaces,increasingthelikelihoodthatdevicescontainingsuchsystemswilladverselyaffectoneanother.Modernelectronicdevicesmustthereforebeablefunctionproperlyinanincreasinglyclutteredelectromagneticenvironment.Thus,theminimizationo
3、felectromagneticinterferenceandsusceptibilityhasbecomeamajordesignobjective.Oftentheeffectsofelectromagneticinterferencearenotdiscovereduntilproducttestingoccurs.Theresolutionofinterferenceproblemsinthelatephasesofproductdevelopmentofteninvolvestheadditionofextraneousco
4、mponentswhichaddtosystemcomplexityandreducereliability.Additionally,itisillegaltosellproductswhichdonotmeetgovernmentregulationsregardingelectromagneticemissions.Itisthereforedesirablethatelectromagneticinterferenceissues,andcompliancewithfederalregulationsregardingemis
5、sionsandsusceptibility,beaddressedintheinitialstagesofproductdesign.Asaresult,muchinteresthasrecentlycenteredontheareaofelectricalengineeringthathascometobeknownasElectromagneticCompatibility(EMC).OftentherootsofEMC-relatedproblemslieincommonmisconceptionsheldbymanyengi
6、neers.Muchofthematerialpresentedtoelectricalengineeringstudentsrepresentsspecializationsofbroaderprinciples.ThemostfundamentalunderstandingofthebehaviorofelectronicdevicesandsystemsrequiresapplicationofMaxwell'sequationsandsignalanalysistechniques.However,suchapplicatio
7、ntosimpledevicesandcircuitsisoftencumbersome.Toavoidthiscomplexity,anapproximateanalysistechnique,usuallyreferredtoaselectriccircuittheory,isusedtodescribethebehaviorofdevicesoperatedatlowfrequency.Forexample,Kirchoff'sVoltageLawandKirchoff'sCurrentLawarisefromFaraday's
8、LawandAmpere'sLaw,respectively.Unfortunately,thebasicconceptsofcircuittheoryandelectromagnetics,(aswellasother