An Accurate Equivalent Circuit Method of Open Ended Coaxial Probe for Measuring the Permittivity of Materials

摘要

An accurate equivalent circuit method analysis for open-ended coaxial probe is used to determine the complex permittivity of materials from the measured input reflection coefficient and admittance. Reference materials of known dielectric properties and selected bakelite plate and water were measured in the frequency range 0.5to 6GHz. This paper offers further analysis the effect of radiation conductane at the end of coaxial probe. The comparisons between the measured results and calculated values indicate this measurement method is effective when considered the effect of radiation conductane.