I am doing research to estimate the dielectric constant using the NRW algorithm after filling the inside of the waveguide with materials.
After making a WR-90 standard waveguide in CST, the thickness was set to 1/8 lambda. Then, FR-4 (loss free) material was filled inside the waveguide.
However, the real part of the relative dielectric constant had a value close to 2 and permeability close to 2.
Below is a screenshot of modeling the waveguide, a graph obtained after putting the extracted S-parameters into the NRW algorithm, and a code.
Because you have defined your ports to be full of the dielectric material there will be no reflection at the port. The input and output ports will be perfectly matched. I think you need to have several mesh cells of air (vacuum) before the dielectric. Then the ports will be matched to air, and you will get a reflection from the face of the dielectric. You may need to move the reference plane if your method uses the phase of the reflection coefficient.
Hello,
I suppose, use vacuum or air first for the inner space of waveguide and also port can be chosen by selecting edges not the whole face of the waveguide. For that one more outer waveguide can be selected.
Thanks,
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