MW and RF Design of Wireless System ch5

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1、电子科技大学MicrowaveandRFDesignofMicrowaveandRFDesignofWirelessSystemsWirelessSystemsChapter5Filter滤波器宋开军Dr.KaijunSong3Functions:功能电子科技大学Filtersareusedtocontrolthefrequencyresponse用来控制频响.①allowingtransmissionatfrequencywithinthepassbandofthefilter.允许频率在滤波器带内的信号传输②attenuat

2、ionwithinthestopbandofthefilter.频率在滤波器阻带内的信号衰减Classificationsbyresponse根据响应分类:Low-Pass,high-pass,bandpass,bandstopLPFHPFBPFBSF低通高通带通带阻Application:应用电子科技大学Inreceivers在接收机中①rejectionsignalsoutsidetheoperatingband.把带外信号反射②attenuatingundesiredmixerproducts.衰减不需要的混频分量③Set

3、tingtheIFbandwidthofthereceiver.设置接收机中频带宽Application:应用电子科技大学Application:应用电子科技大学Application:应用电子科技大学Intransmitters在发射机中①tocontrolthespuriousresponseofupconvertingmixers.控制上变频器的杂散响应②toselectthedesiredsidebands.选择需要的边带③tolimitthebandwidthoftheradiatedsignal.限制辐射信号的带宽E

4、xample电子科技大学Example电子科技大学Example电子科技大学Example电子科技大学Example电子科技大学电子科技大学§§5.1FilterDesignbytheInsertionLossMethod5.1FilterDesignbytheInsertionLossMethod插入损耗法滤波器设计插入损耗法滤波器设计§§5.2FilterScalingand5.2FilterScalingandTransformationTransformation滤波器的标度和变换滤波器的标度和变换§§5.3Low5.3

5、Low--passandhighpassandhigh--passusingTransmissionlinepassusingTransmissionlinestubstub传输线分支实现低通和高通滤波器传输线分支实现低通和高通滤波器§§5.4Stepped5.4Stepped--ImpedancelowImpedancelow--passpassFiltersFilters高低阻抗低通滤波器高低阻抗低通滤波器§§5.55.5BandpassBandpassFiltersusingTransmissionLineResponse

6、FiltersusingTransmissionLineResponse传输线响应实现带通滤波器传输线响应实现带通滤波器§§5.1FilterDesignbytheInsertionLossMethod5.1FilterDesignbytheInsertionLossMethod插入损耗法滤波器设计插入损耗法滤波器设计电子科技大学Idealfilters：Zeroinsertionlossinthepassband;通带内零插损Infiniteattenuationinthestopband;阻带内无限大衰减Linearphas

7、eresponseinthepassband.通带内线性相位Compromisesmustbemade.必须采用折中Theinsertionlossmethodallowahighdegreeofcontroloverthepassbandandstopbandamplitudeandphasecharacteristics.插入损耗法能够方便地控制带内和带外的幅度和相位1.CharacterizationbyPowerLossRatio功率损耗比的描述2.MaximallyFlatLow–passFilterprototype

8、.最大平坦型低通滤波器原型3.Equal–RippleLow–passFilterprototype.等波纹滤波器原型电子科技大学1.CharacterizationbyPowerLossRatio¾Maximallyflatresponse(Butterwor