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2 years ago in Electrical Engineering By Karan D
What’s the correct method to implement a PEC (Perfect Electric Conductor) termination to simulate a short circuit at the end of a waveguide in CST Studio Suite?
I'm modeling a waveguide filter and need to terminate one port with a perfect short to analyze input impedance. I've defined a waveguide port, but I'm unsure how to correctly apply the short. Should I use a "PEC" boundary condition on the end face, or is there a specific "Short Circuit" setting within the waveguide port definition? I need to ensure the short is applied correctly in the modal context so my S-parameter extraction is accurate for the remaining ports.
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By Sarita Answered 1 year ago
In CST, the most robust method is not to use a boundary condition directly on the port face. Instead, follow this procedure: 1. Define your waveguide port on the cross-section where you want the reference plane. 2. Extrude the waveguide wall material (e.g., PEC) to create a closed end a short distance (e.g., a few mesh cells) beyond the port. This physically models the short. 3. In the waveguide port dialog box, ensure the "Free floating" option is NOT checked. This grounds the port. The key is that the PEC short must be orthogonal to and in direct contact with the port's perfectly conductive walls to ensure a zero tangential E-field. I then verify by checking that S11 magnitude is ~0 dB and phase is as expected for the short's electrical distance from the port. Avoid applying a "PEC" boundary condition directly to the port plane, as it can interfere with the port solver.
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