Package: permittivitycalc
Continuous IntegrationCode CoveragePyPI PackageDocsCitationScripts to calculate and plot the complex permittivity (and permeability) from S-parameter data acquired from transmission-line measurementsOverviewpermittivitycalc is a Python package made to take S-parameter data output from METAS VNA Tools II (https://www.metas.ch/vnatools) and process it to determine and plot the complex electric permittivity (and magnetic permeability) of a material measured in a coaxial transmission line.Two analytical calculation methiods are currently implemented:The New Non-iterative Method for permittivity calculation from S-parameters from[Boughriet1997]which assumes that the material is non-magnetic (i.e. mu = 1).The Nicholson-Ross-Weir method to calculate the complex permittivity and permeability of a sample. This method, however, is unstable at multiples of one-half wavelength in the sample[NicolsonRoss1970][Weir1974].permittivitycalc can also use MCMC-based Bayesian model fitting/parameter estimation to fit Cole-Cole type models directly to the measured S-parameters to determine the frequency-dependant complex permittivity (and permeability, if desired). Cole-Cole models support multiple relaxation poles as well as a conductivity term.You can use permittivitycalc to:Input and plot raw S-parameter data in tabular form with or without uncertainties.Calculate and plot the complex permittivity with full propagation of uncertainties.Perform connector de-embedding on the raw S-parameters to extract the sample S-parameters, if necessary. Example: de-embedding washers used to cap the transmission line when measuring powdered samples.Correct for the boundary effect in the transmission line when measuring powdered samples after[Hickson2017].Correct for the air gap when measuring solid samples after[Baker-Jarvis1993].Plot data from multiple measurements together for comparison.Model measured S-parameters directly with a Cole-Cole model using MCMC-based Bayesian model fitting.UsageFor usage examples and a walkthrough on how to use permittivitycalc, see theDocsInstallationRequirementspermittivitycalc was written for Python 3 and tested on the following versions of Python:3.63.7permittivitycalc uses the following packages:tkinternumpyuncertaintiesscipymatplotlibseaborncyclerlmfitemceecornerInstalling AnacondaWe recommend usingAnacondato manage your Python environments.Install Anaconda.Open a terminal window and create aconda virtual environment(name it anything you like, and set the python version to a compatible version inRequirements):conda create --name your_env_name anaconda python=3.7Activate the environment:conda activate your_env_nameQuick InstallInstall permittivitycalc with pip:pip install permittivitycalcManual Install(Optional) Forkpermittivitycalc on GithubClone or download the repository.Navigate to the permittivitycalc root directory and install with:python setup.py installContributorspermittivitycalc was developed with the aid of thesecontributors.References[Baker-Jarvis1993]Baker-Jarvis, J., Janezic, M. D., Grosvenor Jr, J. H., & Geyer, R. G. (1993). Transmission/reflection and short-circuit line methods for measuring permittivity and permeability. NIST Technical Note 1355-R. Boulder, CO.http://doi.org/10.6028/NIST.TN.1355r[Boughriet1997]Boughriet, A. H., Legrand, C., & Chapoton, A. (1997). Noniterative stable transmission/reflection method for low-loss material complex permittivity determination. IEEE Transactions on Microwave Theory and Techniques, 45(1), 52–57.http://doi.org/10.1109/22.552032[Hickson2017]Hickson, D., Sotodeh, S., Daly, M. G., Ghent, R., & Nolan, M. C. (2017). Improvements on effective permittivity measurements of powdered alumina: Implications for bulk permittivity properties of asteroid regoliths. Advances in Space Research, 59(1), 472–482.http://doi.org/10.1016/j.asr.2016.08.011[NicolsonRoss1970]Nicolson, A. M., & Ross, G. F. (1970). Measurement of the Intrinsic Properties of Materials by Time-Domain Techniques. IEEE Transactions on Instrumentation and Measurement, 19(4), 377–382.http://doi.org/10.1109/TIM.1970.4313932[Weir1974]Weir, W. B. (1974). Automatic Measurement of Complex Dielectric Constant and Permeability at Microwave Frequencies. Proceedings of the IEEE, 62(1), 33–36.http://doi.org/10.1109/PROC.1974.9382