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.
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?
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.
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.