Design rules for an experimental setup using an open-ended coaxial probe based on theoretical modelling

In order to obtain a number of design rules for a setup involving an open-ended coaxial sensor to measure the dielectric constant of a material, several parameters are investigated. Using the recently developed spectral-domain model a clear view is given of the influence of the thickness of the test sample. Furthermore, a near-field study of the probe shows that reflections can occur at the transverse boundaries if the test sample is very small. The FDTD is used to investigate the minimum sample size required to simulate a medium that is infinite in the transverse direction. Finally, the influence of the flange of the probe is studied in order to determine the dimensions of the flange needed to correctly use the spectral-domain model. >

[1]  H. Zheng,et al.  Permittivity measurements using a short open-ended coaxial line probe , 1991, IEEE Microwave and Guided Wave Letters.

[2]  F. E. Gardiol,et al.  Reflection of an open-ended coaxial line and application to nondestructive measurement of materials , 1981, IEEE Transactions on Instrumentation and Measurement.

[3]  D. Zutter,et al.  Modeling of discontinuities in general coaxial waveguide structures by the FDTD-method , 1992 .

[4]  Kenneth R. Foster,et al.  Noninvasive electrical characterization of materials at microwave frequencies using an open-ended coaxial line: test of an improved calibration technique , 1990 .

[5]  M. A. Stuchly,et al.  Equivalent circuit of an open-ended coaxial line in a lossy dielectric , 1982, IEEE Transactions on Instrumentation and Measurement.

[6]  C. Papas,et al.  Theory of the Circular Diffraction Antenna , 1951 .

[7]  S. Jenkins,et al.  Use of open-ended coaxial line sensor with a laminar or liquid dielectric backed by a conducting plane , 1992 .

[8]  R. G. Bosisio,et al.  Nondestructive measurements of the resistivity of thin conductive films and the dielectric constant of thin substrates using an open-ended coaxial line , 1992 .

[9]  S. Stuchly,et al.  Numerical Analysis of Open-Ended Coaxial Lines , 1983 .

[10]  Jr. W.R. Scott.  A new technique for measuring the constitutive parameters of planar materials , 1992 .

[11]  Daniël De Zutter,et al.  Measurement of low-permittivity materials based on a spectral-domain analysis for the open-ended coaxial probe , 1993 .

[12]  Nicholas M. Spyrou,et al.  A critical study of the open-ended coaxial line sensor technique for RF and microwave complex permittivity measurements , 1989 .

[13]  Maria A. Stuchly,et al.  Measurement of Radio Frequency Permittivity of Biological Tissues with an Open-Ended Coaxial Line: Part I , 1982 .

[14]  Devendra K. Misra,et al.  Static analysis of an open-ended coaxial line terminated by layered media , 1990 .

[15]  Stanislaw S. Stuchly,et al.  An Equivalent Circuit of an Open-Ended Coaxial Line , 1983, IEEE Transactions on Instrumentation and Measurement.

[16]  G. B. Gajda,et al.  Analysis of an open-ended coaxial line sensor in layered dielectrics , 1986, IEEE Transactions on Instrumentation and Measurement.

[17]  G. Mur.  Absorbing Boundary Conditions for the Finite-Difference Approximation of the Time-Domain Electromagnetic-Field Equations , 1981, IEEE Transactions on Electromagnetic Compatibility.

[18]  M. Stuchly,et al.  Coaxial Line Reflection Methods for Measuring Dielectric Properties of Biological Substances at Radio and Microwave Frequencies-A Review , 1980, IEEE Transactions on Instrumentation and Measurement.

[19]  Weng Cho Chew,et al.  Improved calibration of a large open-ended coaxial probe for dielectric measurements , 1991 .

[20]  S. S. Stuchly,et al.  A new aperture admittance model for open-ended waveguides , 1992 .

[21]  D. K. Misra,et al.  A Quasi-Static Analysis of Open-Ended Coaxial Lines (Short Paper) , 1987 .

[22]  Stanislaw S. Stuchly,et al.  Capacitance of Open-Ended Dielectric-Filled Coaxial Lines-Experimental Results , 1983, IEEE Transactions on Instrumentation and Measurement.

[23]  S. Stuchly,et al.  Dielectric Behavior of Selected Animal Tissues in Vitro at Frequencies from 2 to 4 GHz , 1981, IEEE Transactions on Biomedical Engineering.

[24]  L.L. Li,et al.  Flanged coaxial microwave probes for measuring thin moisture layers , 1992, IEEE Transactions on Biomedical Engineering.

[25]  Nathan Marcuvitz.  Waveguide Handbook , 1951 .