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I'm trying to simulate a connection between two 2-port devices via waveguide but calculated results do not agree with those, calculated in simulation software. All calculations are in the notebooks.

I took a two-port device and compared its S11 characteristic calculated using equivalent circuit with the one, calculated by FEA. Results were similar.

Then I took two similar devices, connected them via waveguide and repeated the calculation procedure. This time S11 characteristics calculated using equivalent circuit in range of waveguide lengths did not match those obtained by FEM software at all.

I checked all my math with sympy so chance of it being the equation transformation error is very low. I suspect that either there's something missing in the equivalent circuit of the waveguide or application of equivalent circuit method is incorrect here fore some reason. Can you, please, help me figure out why calculations yield wrong results?