IEEE Transactions on Electromagnetic Compatibility · 2001 · 59 citations · 9 references
Natural SciencesElectrical EngineeringMaterials ScienceElectronic MaterialsMaterials CharacterizationMicrowave EngineeringDielectric PropertiesDielectricsElectrical CharacterizationElectronic Material CharacterizationMicrowave MaterialsMicrowave MeasurementsDielectric CharacterizationDielectric MeasurementFrequency Dependence Of PermittivityPermittivityPermittivity MeasurementPrinted Circuit BoardsPrinted Circuit MaterialsReflection Coefficient Measurement
This paper presents a simple method to measure the relative permittivity of glass-epoxy printed circuit boards (PCBs). In this method, the relative permittivity as a function of frequency is measured using an actual PCB. In order to estimate the relative permittivity, the reflection coefficient is measured with a network analyzer. The relative permittivity is calculated by observing the frequencies of the resonant cavity modes. We show that the relative permittivity of an FR-4 sample decreases from 4.3 to 4.2 at frequencies from 300 MHz to 2 GHz.
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