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1、FirstEdition,2011ISBN978-93-81157-23-7©Allrightsreserved.Publishedby:TheEnglishPress4735/22PrakashdeepBldg,AnsariRoad,DaryaGanj,Delhi-110002Email:info@wtbooks.comTableofContentsChapter1-IntroductiontoMicrowavesChapter2-CosmicMicrowaveBackgroundRadiationChapter3-MicrowaveTran
2、smissionChapter4-MicrowaveFrequencyBandsChapter5-OtherMicrowaveFrequencyBandsChapter6-WaveguideChapter7-KlystronChapter8-MicrostripChapter9-WaveguideFlangeChapter10-CavityMagnetronChapter11-DiverseMicrowaveTechnologiesChapter-1IntroductiontoMicrowavesAmicrowavetelecommunicat
3、ionstoweronWrightsHillinWellington,NewZealandMicrowavesareelectromagneticwaveswithwavelengthsrangingfromaslongasonemetertoasshortasonemillimeter,orequivalently,withfrequenciesbetween300MHz(0.3GHz)and300GHz.ThisbroaddefinitionincludesbothUHFandEHF(millimeterwaves),andvariouss
4、ourcesusedifferentboundaries.Inallcases,microwaveincludestheentireSHFband(3to30GHz,or10to1cm)atminimum,withRFengineeringoftenputtingthelowerboundaryat1GHz(30cm),andtheupperaround100GHz(3mm).Apparatusandtechniquesmaybedescribedqualitativelyas"microwave"whenthewavelengthsofsig
5、nalsareroughlythesameasthedimensionsoftheequipment,sothatlumped-elementcircuittheoryisinaccurate.Asaconsequence,practicalmicrowavetechniquetendstomoveawayfromthediscreteresistors,capacitors,andinductorsusedwithlowerfrequencyradiowaves.Instead,distributedcircuitelementsandtra
6、nsmission-linetheoryaremoreusefulmethodsfordesignandanalysis.Open-wireandcoaxialtransmissionlinesgivewaytowaveguidesandstripline,andlumped-elementtunedcircuitsarereplacedbycavityresonatorsorresonantlines.Effectsofreflection,polarization,scattering,diffractionandatmosphericab
7、sorptionusuallyassociatedwithvisiblelightareofpracticalsignificanceinthestudyofmicrowavepropagation.Thesameequationsofelectromagnetictheoryapplyatallfrequencies.Whilethenamemaysuggestamicrometerwavelength,itisbetterunderstoodasindicatingwavelengthsmuchshorterthanthoseusedinr
8、adiobroadcasting.Theboundariesbetweenfarinfraredlight,terahertzradiation,mi
