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Multiple input ports in RF problems

Topics: RF, Microwave

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Roberto Olmi

Roberto Olmi

September 23, 2009 8:36am UTC

Multiple input ports in RF problems

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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Robert Koslover

Robert Koslover

October 3, 2009 5:26pm UTC in response to Roberto Olmi

Re: Multiple input ports in RF problems

Well, it works for me. I just designed a custom waveguide structure with 3 excited input ports and 4 output ports.

Any chance you are failing to specify unique port numbers for each port? The default port number for each port is 1. If this is your problem, then number your ports 1, 2, 3, etc, and it should work.

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lukas Alberts

lukas Alberts

May 6, 2010 2:17pm UTC in response to Robert Koslover

Re: Multiple input ports in RF problems

Hello,

for me it says definitely
Error: 5025
More than one port used as input.
- Port number: 5,2
- Boundaries: 29,1
- Application mode: In-Plane TE Waves (rfwe)

2 input ports with differen portnumbers.. 2 and 5..

is the way to add a rfwe physics module?
but then one has to repeat the subdomain definitions..

thanks

lukas

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Felix Vega

Felix Vega

June 8, 2010 4:13pm UTC in response to lukas Alberts

Re: Multiple input ports in RF problems

You should try to do superposition

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