Hello everybody, I have the refractive index values of a new material over wavelength. How can I define this new material in CST? It is noteworthy that the material has complex permittivity.
I am looking forward to hearing from you.
You can define the material permittivity as frequency dependent points. In the material definition window, choose the dielectric dispersion as user defined list. In dispersion list you will able to define the real and imaginary part of permittivity for each frequency value.
The new material having dielectric constant and dielectric loss in a certain frequency range can be defined in CST. Firstly, the new material screen should be opened and then "Dispersion" tab should be selected. After that, the "User" and then "Dispersion list" button which is located in "Dielectric dispersion" panel should be selected, respectively. Finally, the data file should be loaded by clicking "Load file" button. the data file must be txt file and included 3 columns which are frequency, dielectric constant and dielectric loss, respectively. The example view of the data file is attached.
I tried this method but I have problem with Fitting , it prompts that error is too high.
Prithu Roy I am facing the same problem with fitting. Could you please help me if you solve that problem?
Please make sure that it has not any negative sign values in your data. I think that your fitting problems could be eliminated by increasing the 'max order' and/or 'error limit'.
Olcay Altintas Thanks for your kind reply. I have no negative values in my data and 'max order' is 10 which is the max allowed value. However 'used order' is set to 2 and doesn't accept any other higher value !!
Nada Belal , there is option to change the least error, reduce it and order of fitting will increase.
Hello everyone
when i add that material the fitting of complex permitting and permeability is worse, real part of the same is ok. The actual value of complex permitting lies in the range of 2 to 3 but the fitted value lies in the range of 7e-009 which is very low. Can u please help me in this.
Hi Nada Belal! I have the same problem as you. Have you solved it?
In my case, the program fits perfectly the real permittivity but with the complex one, the fit is very bad. My data are very low, in the order of 10^(-8) and the fit gets values around 10^(-5) which is a great difference.
Can someone help me, please?
Go to new material> put a name for your material > set permittivity value in Epsilon space > go to conductivity folder and put loss tangent value in Tangent space. You set the thickness while doing the width and length of the substrate
Shehab Khan Noor Do we need to enable El. conductivity?
Next doubt is what is the option selection for Specification just after at frequency?
Kindly answer me
Thanks
@Anveshkumar no need to enable El. Conductivity. Just put the dielectric value and loss tangent value. Thickness u can change during designing your antenna (W coordinate). Also, set the frequency while putting dielectric and loss tangent value.
I did not understand your second question. Can you elaborate it kindly?
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