ASTM D7449/D7449M-2008 使用同轴空气电缆测量微波频率下固体材料相对复合电容率和相对磁导率的标准试验方法

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【英文标准名称】:StandardTestMethodforMeasuringRelativeComplexPermittivityandRelativeMagneticPermeabilityofSolidMaterialsatMicrowaveFrequenciesUsingCoaxialAirLine
【原文标准名称】:使用同轴空气电缆测量微波频率下固体材料相对复合电容率和相对磁导率的标准试验方法
【标准号】:ASTMD7449/D7449M-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D09.12
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:coaxialline;dielectricconstant;lossfactor;magneticpermeability;measurement;microwave;millimetrewave;permittivity;radiofrequency;scatteringparameter;transmission/reflection
【摘要】:Designcalculationsforradiofrequency(RF),microwaveandmillimetre-wavecomponentsrequiretheknowledgeofvaluesofcomplexpermittivityandpermeabilityatoperatingfrequencies.Thistestmethodisusefulforevaluatingsmallexperimentalbatchorcontinuousproductionmaterialsusedinelectromagneticapplications.Usethismethodtodeterminecomplexpermittivityonly(innon-magneticmaterials)orbothcomplexpermittivityandpermeabilitysimultaneously.1.1Thistestmethodcoversaprocedurefordeterminingrelativecomplexpermittivity(relativedielectricconstantandloss)andrelativemagneticpermeabilityofisotropic,reciprocal(non-gyromagnetic)solidmaterials.Ifthematerialisnonmagnetic,itisacceptabletousethisproceduretomeasurepermittivityonly.1.2Thismeasurementmethodisvalidoverafrequencyrangeofapproximately1MHztoover20GHz.Theselimitsarenotexactanddependonthesizeofthespecimen,thesizeofcoaxialairlineusedasaspecimenholder,andontheapplicablefrequencyrangeofthenetworkanalyzerusedtomakemeasurements.Thepracticallowerandupperfrequenciesarelimitedbyspecimendimensionrequirements(large,thickspecimensatlowfrequenciesandsmallspecimensathighfrequencies).Foragivenairlinesize,theupperfrequencyisalsolimitedbytheonsetofhigherordermodesthatinvalidatethedominant-modetransmissionlinemodelandthelowerfrequencyislimitedbythesmallestmeasurablephaseshiftthroughaspecimen.Beinganon-resonantmethod,theselectionofanynumberofdiscretemeasurementfrequenciesinameasurementbandwouldbesuitable.Thecoaxialfixtureispreferredoverrectangularwaveguidefixtureswhenbroadbanddataaredesiredwithasinglesampleorwhenonlysmallsamplevolumesareavailable,particularlyforlowerfrequencymeasurements1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.Theequationsshownhereassumeane+jx03C9;tharmonictimeconvention.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A55
【国际标准分类号】:17_220_20
【页数】:8P.;A4
【正文语种】:英语