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Hi All,
I am required to design an iris filter. However, without going into deep calculation in transmission line theory, I need to learn basically the design criteria on how should be the length, width of irises or the length between irises, etc.
Is there any document that you can recommend...
Hi All,
How should I set the PML thickness? How do you understand that PML works well?
What I would like to do is frequency sweeping for my model, but I am wondering how should I set the PML thickness. It seems to me when PML works ok with some frequencies that I set but not the whole...
Hi Karesz,
Thanks for your quick reply. I am going to work in THz range (between 0.3 to 10 THz). Now I search for possibilities on what can be done in this range.
Hi All,
If there anybody who is familiar with THz and its applications or follows the developments in the area? I need help to find some new ideas.
I would be glad if you can share with me some new ideas could be challenging or interesting in the area of THz generation and propagation in terms...
Hi Maciasas,
I have obtained the dispersion curve as well as the transmission plots for my design, but at the points transmission decreases sharply, this should correspond to cutoff frequency, right?
But these point are not the same point that modes change.
or maybe I am completely lost...
Hi all,
How can I calculate the cutoff frequencies in a photonic crystal waveguide. It seems it is similar to rectangular waveguide, but it doesnt correspond to same values.
Is there any formula to calculate cutoffs for photonic crystal waveguides?
Thanks in advance,
Translight metal
Hi All,
I try to get transmission coefficients of metallic structure using Translight, but whenever I set metallic features, it gives error in the meantime of calculation.
I would be grateful, if anyone experienced with Translight could help me. Please explain the steps how...
drude model comsol
Hi,
I know it is because of the sign convention, but still not sure about how to type in Comsol. The values from Drude model, and how it is defined in books.
thanks,
comsol permittivity
Hi All,
I have a problem with entering complex permittivity. I have permittivity values for such a material from a formula, it has negative real and positive imaginary part. According to some support cases, it says imaginary part of permittivity has to be negative for a...
Hi,
If I understand your question correctly,this may help. Have you tried to create another geometry for the port area? Let say, rectangle for face and another small rectangle for port, so you will have 2 geometries on the same face that you can specify port differently.
Hope this works...
Re: Metallic losses, COMSOL
I think, I've set a proper value for sigma, I checked transmission results from a paper. Anyway, the problem is to define metallic rods is that enough defining as a subdomain and giving parameters? Or should I take skindepth into account, but how? For this I tried to...
Metallic losses, COMSOL
Hi all,
I've been trying to simulate electric field inside a waveguide with
metal rods. But it seems there is less losses than as it should be. I
defined rods as a subdomain with epsilon and sigma but it gives wrong
results, then I tried impedance boundary condition for...
fdtd of waveguide
Hi,
Thanks for the book, I've already started to study photonic crystal waveguide with FEM. So now dont have chance to do this with FDTD.
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