Lumped port problem (Element 1 should be placed between two conductive boundaries)

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When I placed the lumped port in the CPW design the error showed - "Subfeature Uniform Element 1 should be placed between two conductive boundaries. - Feature: Uniform Element 1 (ue1) " - I placed the lamped port in between the perfect electric conductor boundary, still this error message came and stopped the process. Can anyone check the file attached and give me the advise to correct this? I already go through the examples COMSOL provide, but can not understand the problem. Also the ground and ports are not connected to each other (separated by a air gap).



2 Replies Last Post 11 sept. 2025, 18:10 UTC+2
Robert Koslover Certified Consultant

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Posted: 7 hours ago 11 sept. 2025, 16:05 UTC+2
Updated: 7 hours ago 11 sept. 2025, 16:08 UTC+2

You appear to have placed conducting boundaries around ALL the edges of your lumped ports. That is not the right way. You are shorting out the ports -- look at your settings under Perfect Electric Conductor 1 and Perfect Electric Conductor 2. The electric field in each rectangular port should travel perpendicularly from one conducting edge of a port to the opposite, parallel edge of the port. It should not travel along a conducting edge, since that would short out the port.

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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
You appear to have placed conducting boundaries around ALL the edges of your lumped ports. That is not the right way. You are shorting out the ports -- look at your settings under *Perfect Electric Conductor 1* and *Perfect Electric Conductor 2*. The electric field in each rectangular port should travel perpendicularly from one conducting edge of a port to the opposite, parallel edge of the port. It should not travel *along* a *conducting* edge, since that would short out the port.

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Posted: 5 hours ago 11 sept. 2025, 18:10 UTC+2

thank you for such fast response, I will correct this

thank you for such fast response, I will correct this

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