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HFSS.
The issue is not the waveguide. The standard waveguide simulation gives optimum S11 and S12/S21 performance. The problem starts when the waveguide is used as a single ended i.e, waveguide antenna. The S11 degrades in this configuration.
I have an issue in designing a Waveguide port termination. The waveguide simulation works for the desired frequency when both the ends of the waveguide are driven by a waveguide port. When single ended simulation happens the S11 performance is poor.
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