Jian-Qiang Gong said:Hi, SAJ25
What do you mean by multi resonance structures? Don't you mean the SRR/Wire structure studied most belongs to the single resonance structure? So why the retrieval method in the paper "Robust method" can only deal with the single resonance structure rather than the multi resonance structure?
helio1972 said:Hi all,
I have redo the same work reported in this article "Electromagnetic parameter retrieval from inhomogeneous metamaterials" published in PRL by Smith in 2005. The results are the same. but the probleme is when I change the excitation (the wave propagation now is perpendicualr the particle plane under study) this method doesn't work anymore.So I moved to another method.
For people who used CST I would like to mention that they have to deembed Sij in order to get correct results. if the results are not deembed the retrieval method gives wrong results.
best wishes.
tungsin said:ok i am going to upload some papers which i think to be important
first is robust method paper, second one is another paper that mentioned about the different calculation in homo and inhomogeneous structure. I think you can verify ur code by using data from second paper (both cases: homo and inhomogeneous structures).
Group,
After inspecting the codes uploaded to this discussion, neither seem to implement the algorithms correctly. An important thing to consider here is the "branching." In the Smith code for example there is an inverse cosine function. There are an infinite number of answers here because
cos(a + 2*pi*m) = cos(a) m=...,-2,-1,0,1,2,...
The uploaded code assumes m=0, which is not a correct assumption.
In the "Robust" code, the branching problem is handled through continuity of the material functions. This feature is not present in the uploaded code and again the m=0 assumption was made. The algorithm also defines a procedure for determining the correct thickness of the slab that does not seem to be part of the uploaded code.
These codes are a great start, but they are incomplete and will likely only give correct results for thin slabs and at frequencies away from resonance.
Unfortunately, I have not written these algorithms myself, but I may have a need for them in a few months. If I do, and I get them working correctly, I will certainly share with the group. I actually hope somebody will make the modifications and share their code before then.
Thanks!!
-Tip
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