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Multiple input ports in RF problems

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Hello to everyone.

The RF module Users Guide, at page 72, says (Note at the top of the page) that it is possible to have more than an excited inport, with the drawback that S-parameters are not correctly computed.

On the contrary, COMSOL seems to not allow this: I need to excite a microwave cavity with two waveguides at the same time, but the program does not allow me to put a waveguide excitation on both ports.

Any suggestion?

Thnaks,
Roberto

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