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1、2阻抗匹配技术射频系统为什么要求阻抗匹配？宽带与窄带系统判断标准：宽带设计的困难WideBandRequirementinUWBSystemf=3.168to10.560GHz,BWband=528MHz.Table2FrequencyplanofUWBsystemPrimaryBandPlanNewBandGroup6NewWorld-widecompliantBandPlan3168369642244752528058086336686473927920844889769504100321056034323960448850165544607266
2、0071287656818487129240976810296Frequency,MHzBandBandBandBandBandBandBandBandBandBandBandBandBandBand#1#2#3#4#5#6#7#8#9#10#11#12#13#14BandGroup1BandGroup2BandGroup3BandGroup4BandGroup5MandatoryOptionalOptionalOptionalOptionalOptional31683696422447525280580863366864739279208448897
3、695041003210560343239604488501655446072660071287656818487129240976810296Frequency,MHzBandBandBandBandBandBandBandBandBandBandBandBandBandBand#1#2#3#4#5#6#7#8#9#10#11#12#13#14BandGroup1BandGroup2BandGroup3BandGroup4BandGroup5MandatoryOptionalOptionalOptionalOptional宽带系统的阻抗匹配反射损耗S
4、11orS22,与SmithChart原点的距离应该尽可能小；2)反射损耗S11orS22圆所包含的面积应该尽可能小。阻抗匹配的判决匹配情况与S11、S22的位置相关(b)WidebandresponseS11orS22,dB0-10fcfL,fH,Frequency,MHzfmaxfmin(a)NarrowbandresponseS11orS22,dB0-10fcfL,fH,Frequency,MHzfminfmaxEUNVZfLZfHSWZfmaxZfminoS11orS22testingEUNVZfLZfHSWS11orS22testingZfm
5、axZfmino匹配情况与S11、S22的面积相关EUNVZfLZfHSWS11orS22testingZfmaxZfmino(a)NarrowbandresponseS11orS22,dB0-10fLfH,Frequency,MHzfminfmaxf,o(b)WidebandresponseFrequency,MHzfL,fH,fminfmaxS11orS22,dB0-10f,oEUNVZfLSWZfmaxZfminoS11orS22testingZfH插入单个元件时的反射曲线变化f串联电感0ΔZL,j0ΔZL=jLω+-OESWVNZfL,1ZfH
6、,1ZfH,2ZfL,2(a)ImpedancetracekeptinevenshapeU当插入串联电感时，反射曲线从“1”变化到“2”Impedancetrace#1,ZfL:Impedanceatlowfrequencyend,Impedancetrace#2,ZfH:Impedanceathighfrequencyend,MovingdirectionofimpedanceSubscript“1”,“2”denotesnumberofimpedancetrace,Demarcationcircle,RL=-10dB.OESWVNWZfL,1ZfH
7、,1ZfL,2ZfH,2U(b)Impedancetracechangedfromeventocurlyshape串联电容f0ΔZC,j0ΔZC=-j(1/Cω)+-ZfH,3ZfL,3ZfL,4ZfH,4OESVNUW(a)ImpedancetracekeptinevenshapeESWVNUOZfH,3ZfL,3ZfH,4ZfL,4(b)Impedancetracechangedfromeventocurlyshape在插入串联电容后，反射曲线从“3”变到“4”.Impedancetrace#3,ZfL:Impedanceatlowfrequenc
8、yend,Impedancetrace#4,ZfH:Impedanceathighfreque
