I am currently working on the design of an Intelligent Reflecting Surface (IRS/RIS/ metasurface) using CST Studio. I’ve encountered an issue where the S-parameters(S11) show a sudden change at my resonance frequency of 3.5 GHz. This behavior contrasts with what is often reported in IEEE papers, which typically show a smooth transition from 180 to -180 degrees.
My question is if this sudden change is expected or if it indicates a problem with my design or simulation setup ?
Additionally,Are there any process to bias the IRS in cst studio?
I have attached a graph showing the S-parameters for reference.
The phase is actually changing smoothly, but the sudden jump you see on the graph is due to how the phase is being displayed. In your graph, the phase is shown in a range from -180 to 180 degrees. So, if the phase goes below -180 degrees, instead of showing -181 degrees, it jumps to +179 degrees. This jump is what's causing the sudden change on your plot.
Yes... it is as the colleague above tells you. Just right-click on the graph and select unwrap to undo that jump.
As per my understanding to your question, it is similar to my longstanding problem. And I got the solution recently. This happens when you do not define the deemebeding distance between the reflector surface and the zmax (port) of the box.
Hello,
Yes, This jumps in the graph just because of the way the author is analyzed.
Thanks,
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