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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Defining dispersive material

Posted 2013年5月23日 GMT-4 18:15 RF & Microwave Engineering, Materials, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.3a 2 Replies

Naren Viswanathan
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Hi,

I need to define a material that has Eps Real = 1 and Eps Imag = 2 at 0.1 GHz. How do I fit a 1st order model for this material?

I have uploaded a screenshot of the dispersive curves for this material in CST Microwave Studio.

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2 Replies Last Post 2013年5月24日 GMT-4 10:19
Naren Viswanathan
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Posted: 1 decade ago 2013年5月23日 GMT-4 18:16
Eps Imag = 20, not 2
Eps Imag = 20, not 2
Ulf Olin COMSOL Employee

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Posted: 1 decade ago 2013年5月24日 GMT-4 10:19
Hi,

If you have a tabulated function in a text file, comma-separated file or Excel sheet, you can import it into an interpolation function. Right-click Global Definitions or Model 1 > Definitions and select Funcions > Interpolation. In the Definition window, set Data source to file, browse to your file and finally click the Import button. Now you have your tabulated function that you can use for your material parameter.

You also have a few pre-defined models for the relative permittivity. Navigate to the Wave Equation settings and the Electric displacement field model combobox. There you can select Drude-Lorentz, Debye and Sellmeier dispersion models.

Best regards,

Ulf
Hi, If you have a tabulated function in a text file, comma-separated file or Excel sheet, you can import it into an interpolation function. Right-click Global Definitions or Model 1 > Definitions and select Funcions > Interpolation. In the Definition window, set Data source to file, browse to your file and finally click the Import button. Now you have your tabulated function that you can use for your material parameter. You also have a few pre-defined models for the relative permittivity. Navigate to the Wave Equation settings and the Electric displacement field model combobox. There you can select Drude-Lorentz, Debye and Sellmeier dispersion models. Best regards, Ulf

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