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How should waveguide ports be correctly assigned for bent antennas in CST Studio?

I am modeling bent waveguide-fed antennas in CST, where the feed geometry is not straight.
Default port placement often causes reflections or simulation errors.
I want to understand how experienced designers assign ports for accurate S-parameters and field analysis.

All Answers (1 Answers In All)

By Emre Answered 1 year ago

From my experience, correctly assigning waveguide ports on bent antennas requires careful alignment with the local waveguide axis rather than the global coordinate system. I have seen common errors when ports are placed on non-planar faces, which introduces spurious reflections or mode mismatches. I would recommend using ports normal to the local waveguide face, ensuring the cross-section matches the waveguide mode, and verifying that the port length is sufficient to allow proper mode development. In practice, combining this setup with a short parametric sweep for port dimensions often resolves unexpected S11 or radiation anomalies.

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