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Multi-Port S-parameter Calculation Simultaneously

Posted Oct 22, 2015, 6:52 a.m. EDT RF & Microwave Engineering Version 5.1 4 Replies

Cris Wu
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Hi, Is Comsol able to calculate the S-parameters of multiports in s single computing ?

For example, if i want to know s11 s21, s12 and s22 , i have to first set port 1 on port 2 off and compute to get s11 and s21, then manually set port 1 off port 2 on to compute s12 and s22, it there an automatic way to do this ?

Thanks.
Cris
4 Replies Last Post May 20, 2016, 11:55 a.m. EDT
Sergei Yushanov Certified Consultant
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Posted: 9 years ago Oct 22, 2015, 8:11 a.m. EDT
Cris,

Yes, there is an automatic way to calculate full matrix of S-parameters. In the Settings window for the “Electromagnetic Waves, Frequency Domain (emw) root node, there is section “Port Sweep Settings” where you can check “Activate port sweep” option, as shown in the attached image. This will allow you to perform sweep over the one active port at a time and extract full S-matrix using Global evaluation node.

Regards,
Sergei
Cris, Yes, there is an automatic way to calculate full matrix of S-parameters. In the Settings window for the “Electromagnetic Waves, Frequency Domain (emw) root node, there is section “Port Sweep Settings” where you can check “Activate port sweep” option, as shown in the attached image. This will allow you to perform sweep over the one active port at a time and extract full S-matrix using Global evaluation node. Regards, Sergei
Cris Wu
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Posted: 9 years ago Oct 22, 2015, 1:24 p.m. EDT
Sergei,

Many thanks.

A more detail step by step tutorial can be found in page 19-21
nf.nci.org.au/facilities/software/COMSOL/4.2/doc/pdf/rf/IntroductionToRFModule.pdf

Best Regards

Cris
Sergei, Many thanks. A more detail step by step tutorial can be found in page 19-21 http://nf.nci.org.au/facilities/software/COMSOL/4.2/doc/pdf/rf/IntroductionToRFModule.pdf Best Regards Cris
Mandeep Singh
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Posted: 9 years ago May 20, 2016, 8:54 a.m. EDT
HI! I am designing switch with three port structure. PORT 1 as input, PORT 2 Output, and PORT 3 as Control port. I am getting all S-parameters using "SWEEP PORT" command for ON STATE, but not for OFF State.. [means when PORT 1,3 are ON and PORT 2 is OFF]...

Is it possible to extract all S-parameters for 3 port device when 2 ports are excited and one is OFF..

Thanks,

HI! I am designing switch with three port structure. PORT 1 as input, PORT 2 Output, and PORT 3 as Control port. I am getting all S-parameters using "SWEEP PORT" command for ON STATE, but not for OFF State.. [means when PORT 1,3 are ON and PORT 2 is OFF]... Is it possible to extract all S-parameters for 3 port device when 2 ports are excited and one is OFF.. Thanks,
Cris Wu
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Posted: 9 years ago May 20, 2016, 11:55 a.m. EDT
Yes,

you can disable the "activate port sweep" , and select two ports on manually.

if you want to do a sweep, you can turn all three port on, and set a variable for the "Port input power", when the power is zero, it is actually at off state. then sweep the varaible to turn off the port one by one.

Hope it works.

Cris
Yes, you can disable the "activate port sweep" , and select two ports on manually. if you want to do a sweep, you can turn all three port on, and set a variable for the "Port input power", when the power is zero, it is actually at off state. then sweep the varaible to turn off the port one by one. Hope it works. Cris

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