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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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I export only S11 as S Parameter what about s12,21,22 ?

Posted 28 feb 2013, 09:06 GMT-5 Version 4.3 17 Replies

AH
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17 Replies Last Post 7 mar 2013, 06:15 GMT-5
Edgar Kaiser
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Posted: 1 decade ago 28 feb 2013, 09:49 GMT-5
How about adding the other results you want into the lines below?
How about adding the other results you want into the lines below?
AH
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Posted: 1 decade ago 6 mar 2013, 09:12 GMT-5
Edgar Kaiser
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Posted: 1 decade ago 6 mar 2013, 09:59 GMT-5
Hi,

you can post the file to the forum. Clear mesh and solutions to keep it small.

Cheers
Edgar
Hi, you can post the file to the forum. Clear mesh and solutions to keep it small. Cheers Edgar
AH
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Posted: 1 decade ago 6 mar 2013, 11:51 GMT-5
Edgar Kaiser
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Posted: 1 decade ago 6 mar 2013, 16:16 GMT-5
Ahmed,

your model has only one port, so the 2-port components of the S-matrix cannot be available. I don't know what the function of your assembly is (resonator?, filter?). If it is meant to have input and output you must configure two ports respectively, one of them excited typically. Then you will see S12, S21 and S22 in the results.

Greetings, also from Germany,
Edgar

Ahmed, your model has only one port, so the 2-port components of the S-matrix cannot be available. I don't know what the function of your assembly is (resonator?, filter?). If it is meant to have input and output you must configure two ports respectively, one of them excited typically. Then you will see S12, S21 and S22 in the results. Greetings, also from Germany, Edgar
AH
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Posted: 1 decade ago 7 mar 2013, 03:06 GMT-5
Edgar Kaiser
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Posted: 1 decade ago 7 mar 2013, 04:05 GMT-5
Ahmed,

I haven't worked with SPICE netlists so far but there were contributions on the forum about that. I still don't understand how your device should work as a two port device in a circuit.
The way you defined the port it works as a shorted transmission line, like a 'Lecherleitung' only twisted, to save space?

Cheers
Edgar
Ahmed, I haven't worked with SPICE netlists so far but there were contributions on the forum about that. I still don't understand how your device should work as a two port device in a circuit. The way you defined the port it works as a shorted transmission line, like a 'Lecherleitung' only twisted, to save space? Cheers Edgar
AH
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Posted: 1 decade ago 7 mar 2013, 04:17 GMT-5
Edgar Kaiser
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Posted: 1 decade ago 7 mar 2013, 04:39 GMT-5
Ahmed,

I can't handle the SPICE netlist. Can you post a circuit diagram?
Ahmed, I can't handle the SPICE netlist. Can you post a circuit diagram?
AH
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Posted: 1 decade ago 7 mar 2013, 04:45 GMT-5
AH
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Posted: 1 decade ago 7 mar 2013, 04:45 GMT-5
Edgar Kaiser
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Posted: 1 decade ago 7 mar 2013, 04:48 GMT-5
I need a normal, graphical circuit diagram with resistors, capacitors and whatever, I cannot work with netlists.
I need a normal, graphical circuit diagram with resistors, capacitors and whatever, I cannot work with netlists.
AH
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Posted: 1 decade ago 7 mar 2013, 04:56 GMT-5
Edgar Kaiser
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Posted: 1 decade ago 7 mar 2013, 05:06 GMT-5

I see a shorted transmission line in your diagram. This is a one-port device and is typically and fully described by S11. The wave goes into the device and you want to know how much comes back and at which phase. This is all in S11.

Cheers
Edgar
I see a shorted transmission line in your diagram. This is a one-port device and is typically and fully described by S11. The wave goes into the device and you want to know how much comes back and at which phase. This is all in S11. Cheers Edgar
AH
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Posted: 1 decade ago 7 mar 2013, 05:10 GMT-5
Edgar Kaiser
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Posted: 1 decade ago 7 mar 2013, 05:48 GMT-5
Ahmed,

I am sorry I can't contribute much about SPICE netlists in COMSOL. As I said I haven't done that so far. I hope I could explain why COMSOL is not producing two-port parameters the way you set up the model.

Cheers
Edgar
Ahmed, I am sorry I can't contribute much about SPICE netlists in COMSOL. As I said I haven't done that so far. I hope I could explain why COMSOL is not producing two-port parameters the way you set up the model. Cheers Edgar
AH
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Posted: 1 decade ago 7 mar 2013, 06:15 GMT-5

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