[SOLVED] HFSS Metamaterial Lens Simulation validation

[srijan.rio]

Hi everyone,

I am trying to validate Shreiber et.al. 's paper on Metamaterial lens simulation for microwave NDE (https://doi.org/10.1016/j.sna.2010.12.004).

I have attached the HFSS model I am using for the validation. I am getting the normal transmission after 5.5 GHz, but unable to get the transmission peak at 3 GHz due to evanescent wave propagation.

However, I have used the Smith's parameter retrieval equations (permittivity, permeability and refractive index) and getting resonance as expected around 3GHz. What may be the reason of not getting a transmission peak even though there is an apparent magnetic resonance at that frequency. Any help will be much appreciated.

Thank you

 

[PlanarMetamaterials]

Hi srijan.rio,

Looks like a complex problem. Some basic questions:

- Have you tried the 2D case? Can you confirm similar behavior?
- There are 4 unit cells being used in your simulation, not 3, do you expect this to make a difference? Have you tried 3 as in the paper?

 

[srijan.rio]

Hi ,

I have used 3 cells as in paper, but getting similar transmission response ( i.e. no left handed peak at 3 GHz). Switching to a larger number is supposed to make the lens more effective, hence tried using 4. I might well use a larger number and see if and how it is affecting the response. Thanks for the thought process.

I also haven't tried the 2D structure yet. I will try to simulate that model as well and get back to this thread with what I get.

 

[srijan.rio]

Hey,

So I tried the two things.

With the 2D structure, I am able to get the left handed transmission peak at 2.8 GHz as described in the paper. (The HFSS model is attached)

However, with the 1D structure, I am still not able to get the peak (using different number of unit cells didn't solve it either).

I have used similar model and boundary conditions for both of them. Any suggestions as to what else might be causing this will be great.

 

[PlanarMetamaterials]

Sorry, there doesn't appear to be anything immediately incorrect that I can spot. You might try setting up a seed mesh to ensure that the SRRs are appropriately meshed in both cases.

Good Luck!