Designation:D5568−22aStandardTestMethodforMeasuringRelativeComplexPermittivityandRelativeMagneticPermeabilityofSolidMaterialsatMicrowaveFrequenciesUsingWaveguide1ThisstandardisissuedunderthefixeddesignationD5568;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversaprocedurefordeterminingrelativecomplexpermittivity(relativedielectricconstantandloss)andrelativemagneticpermeabilityofisotropic,reciprocal(non-gyromagnetic)solidmaterials.Ifthematerialisnonmagnetic,itisacceptabletousethisproceduretomeasurepermittivityonly.1.2Thismeasurementmethodisvalidoverafrequencyrangeofapproximately100MHztoover40GHz.Theselimitsarenotexactanddependonthesizeofthespecimen,thesizeofrectangularwaveguidetransmissionlineusedasaspecimenholder,andontheapplicablefrequencyrangeofthenetworkanalyzerusedtomakemeasurements.Thesizeofspecimendimensionislimitedbytestfrequency,intrinsicspecimenelectromagnetismproperties,andtherequestofalgorithm.Beinganon-resonantmethod,theselectionofanynumberofdiscretemeasurementfrequenciesinameasurementbandwouldbesuitable.Useofmultiplerectangularwaveguidetransmissionlinesizesarerequiredtocoverthisentirefre-quencyrange(100MHzto40GHz).Thistestmethodcanalsobegenerallyappliedtocircularwaveguidetestfixtures.Therectangularwaveguidefixtureispreferredovercoaxialfixtureswhensampleshavein-planeanisotropyoraredifficulttomanufactureprecisely.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareininch-poundunitsandareincludedforinformationonly.Theequationsshownhereassumeane+jωtharmonictimeconvention.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicab...
