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2D coplanar waveguide Port Modeling

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Hello everyone,

I have a very simple 2 D model of the crossection of a coplanar waveguide (substrate in an air box, at the boundary between substrate and air I have lines for the metallization). I want to set the center conductor line as active port. However, I cannot select any of the metallization lines for the port. Can anyone advise me how to deal with the port issue?

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