简介：Anopen-endedcoaxiallinereflectionmethodespeciallysuitableformeas-uringthedielectricpropertiesofbiologicaltissueinvivoisdescribed.Thismethodofferstheadvantageofnotrequiringanyspecialpreparationofthesamplestobemeasuredbutaclosecontactwiththeopenendofacoaxialline.Itis,therefore,veryconvenienttoacquirealargenumberofmeasurementdatainbroadbandrapidly.Themethodmayalsobeusedtomeasurethepropertiesofothersubstances.ThemeasuringsystemconsistsofanetworkanalyzercontrolledbyamicrocomputerandcalibratedbyusingANAproceduretoelimi-hatetheinflunceoferrornetworkintroducedbytheadapter,someconnectors,etc.Inor-dertoreachhigheraccuracy,theiterativemethodisusedtodeterminetheparametersoftheequivalentcircuit.Measurementsofpermeativitiesofsomelivingtissueshavebeenper-formedinthefrequencybandof0.5-2GHz.Comparedwiththeresultsknowninsomepapers,thevalidityofthismethodhasbeenconfirmed.Thedifferenceindielectricproper-tiesbetweenlivinganddeadtissues,andthetissuepermeativites(ε)versusfrequencyanddurationofmeasurementafterdeathhavealsobeenmeasured.