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1、EngineeringElectromagneticFieldsandWavesCarlT.A.JohnkProfessorofElectricalEngineeringUniversityofColorado,BoulderJ...i.,JOHNWILEY&SONSNewYork•Chichester•Brisbane•Toronto•Singaporerr>To.-Jeanetter.;andtheBoysPrefaceItmightindeedbedifficulttojustifyanothert
2、extonundergraduateelectromagneticfields,exceptthatthisworkgrewoutofsomespecificneedsintheelectricalengineeringcurriculumattheUniversityofColoradothatmightconceivablyextendtosimilarneedsexistingelsewhere.Untilafewyearsago,thejunior-leveltwo-semestersequenc
3、einintroductoryfieldandwave-transmissiontheorycoveredstaticelectricandmagneticfieldsduringthefirstsemester(employingamoreconventionalfieldstextwrittenfromthe"historical"pointofview),andthen(usinganothertext,ortexts),thesecondsemestercoveredprincipallythet
4、heoryandapplicationsoftransmissionlinesandwaveguides,plusanintroductiontoantennatheoryandradiation.Theproblemsarisingfromthisschemelayinthefactthatinusingtwoormoretextbooks,thedifferencesinapproachandinsymbolicnotationscontributedtoasubstantiallossoftimer
5、equiredinrelearnings~meoftheideasthatshouldhavecarriedoversmoothlyfromthefirstsemester'swork.Moreover,indevelopingstaticfieldsfromthehistoricalapproach(viatheexperimentalCoulombandAmperelaws),theunderstandingoftheunderlyingMaxwell'sequationswasdeferredunt
6、ilnearlytheendofthefirstsemester,judgedbythisauthortobeamajordisadvantage.Thepresenttextrepresentsanefforttoallaythesedifficulties.Itistheculminationofseveralpreliminaryversions,usedintheclassroomformorethansevenyearsattheUniversityofColoradoandbycolleagu
7、esatthreeotheruniversities.Importantfeaturesofthisbookmightbesummarizedasfollows:1.Maxwell'sequationsarepostulatedforfreespaceattheoutsetandthendevelopedformaterialregions,alongwiththeboundaryconditions,withinvii·viiiPrefacethefirstthreechapters.Applicati
8、onstobothstaticandtime-varyingproblemsillustratethisdevelopment.Afulltreatmentofelectrostaticandmagneto•staticfieldsasspecialcasesisthenofferedinChapters4and5,permittingasmoothtransitiontoquasi-statictime-varyingfie
