Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Hi aleem_jamali!
I suggest you to try to do ask the program said: instead of specifying the scan angle - state the phase difference from one face to the other. I guess the problem is that CST calculates angles relative to the background material which is obviously not air in your case. Or...
Hi!
I have been able to do such simulations. More specifically, I tried (1) a two-phase system comprising half-space vacuum and half-space lossless silicon (epsilon=11.9 and mu=1) and (2) a three-phase system comprising vacuum, thin film of arbitrary material (I tried epsilon=2, mu=1 and a...
I think simulating a semi-infinite substrate that is different from the background (eg vacuum) is trivial since CST automatically recognizes what you want to do. Just set up a finite thickness of the substrate beneath your structure, eg going down to Zmin. In the x and y direction use the unit...
Hi!
I haven't done anything similar but have an idea how to do it in CST:
Represent graphene by a layer that is d_g=0.34nm thick. For material, choose 'Normal' type, leave 'Epsilon' and 'Mue' to be 1 and set the electric conductivity to be e^2/(4*hbar*d_g). Here e^2 is the electron charge and...
Re: invisibility cloak
Hi!
I see that several of you guys have similar problems: point source in TM and matrix values of epsilon and mu in 2D Comsol simulations.
Firstly, in order for a problem to be 2D it has to satisfy certain conditions.
1. you can't have a point source in a 2D problem...
Re: Cloaking
Hi qqqooo!
I think perhaps I didn't get precisely what you were saying but probably I got the point. I like your questions.
First: for the 2D cylinder case the cloaking formula gives 0 and infinite values of eps and mu, while for the 3D sphere case it is 'only' 0 - there is no...
Re: Cloaking
Hi iaia!
Ok, I understand - you are not doing the nonmagnetic cloak and the paper from APL (Cai and Shalaev) you mentioned only because it deals with the second order mapping.
Yes, you need to substract the incident field (plane wave) from the total field and only then to...
Re: Cloaking
Hi iaia,
I just saw your post and took a very brief look on the file you sent me. There are couple of things I don't understand:
1. why are you using the hybrid-wave simulation; the point of the paper in APL from Cai and Shalaev is that they use nonmagnetic cloaks for TM waves...
phi component comsol
Hi iaia,
I just figured out that you're the same person from this other topic. So, you're doing cloaks?
Ok, this is how I did the calculation of the power flux for the first time:
1. draw a contour around the scatterer (in my case, this was a square)
2. do the simulation...
Re: Cloaking
Hi iaia,
I have done a zillion of cloak simulations in COMSOL with various parameters for the cloak (those from the references and some 'self-made') and it always worked. The solver I invariably use is the default one - the Direct (UMFPACK) Solver. I don't see why it doesn't work...
how to use comsol far field
What do you need the far-field for?
The only reason why the scattering cross section is calculated using the asymptotic far-field expressions is to obtain analytic expressions. If you already have the numerical solution for the fields, I see not point converting...
Re: Cloaking
Is that a joke? :)
You can find papers of prof. A. Greenleaf on arxiv.org. There is this huge (~60pages) paper on cloaks. There, he uses all kinds of math stuff. It is interesting and I guess you could start from there picking things up. However, I guess it would take some time...
comsol time integration
Yes, you are rigth wandering heart - had I known this, it would save me quite some time :)
Is it possible to integrate flux e.g. for 2D ?(i.e. is it possible that the integration recognizes the line segments as vectors)? This is necessary if a irregularly contour is...
Re: Cloaking
Well, I think there is a bit more to light wormholes than 'blowing up a curve' :) True, the idea is the same, but then, again, the question is what do we mean by 'the idea'. Transformation media was 'invented' decades ago for use in FEM. Actually, it is even older - it follows from...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
