Why does this Frequency Selective Surface show odd behavior at high frequency?
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I'm simulating a metal-mesh optical lowpass filter. I've drawn one unit cell of the filter (seen below). I've assigned primary/secondary boundaries to the sides of the airbox, and floquet ports to the top/bottom. I'm running an interpolating frequency sweep from 10 GHz to 1 THz.
As you can see from the S-parameter plot, the filter behaves as expected at frequencies below about 600 GHz, but contains significant ripple above this frequency. Are my simulation settings causing this?
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