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Directional Coupler

Posted Mar 14, 2014, 12:46 a.m. EDT RF & Microwave Engineering Version 4.4 8 Replies

Ravi
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I am trying to model a directional coupler in 2D. I get the following error
Undefined value found.
- Detail: Undefined value found in the equation residual vector.
There are 1 degrees of freedom giving NaN/Inf in the vector for the variable comp1.ewbe.S1x.
at coordinates: (0,0), ...
There are 1 degrees of freedom giving NaN/Inf in the vector for the variable comp1.ewbe.S2x.
at coordinates: (0,0), ...
There are 1 degrees of freedom giving NaN/Inf in the vector for the variable comp1.ewbe.S3x.
at coordinates: (0,0), ...

What does this error mean?

8 Replies Last Post Aug 20, 2014, 4:21 a.m. EDT
Felipe Beltran-Mejia
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Posted: 1 decade ago Mar 14, 2014, 12:01 p.m. EDT
Ravikant,

can you please post a simplified version of your model?

cheers,
Felipe BM
Ravikant, can you please post a simplified version of your model? cheers, Felipe BM
Ravi
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Posted: 1 decade ago Mar 14, 2014, 1:25 p.m. EDT
Hey Felipe
Please find the model attached over here.
Thanks
Ravi
Hey Felipe Please find the model attached over here. Thanks Ravi

Attachments:

Felipe Beltran-Mejia
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Posted: 1 decade ago Mar 14, 2014, 2:08 p.m. EDT
Ravikant,

I have found some errors in your model.

1) Port 4 has no active boundaries.
2) In all Boundary Mode Analysis (steps 1-4) you must use a positive integer for the "Port Name". Instead you use a mixture of numbers and dots which I dont understand where they came from.

Question1: are you trying to mix a symmetric and anti-symmetric mode?
Question2: How do you calculate (and visualize) those effective indexes? You will need them as a shoot, in order to put that value inside the box called "Search for modes around:"

Try correcting the errors above and please tell me if that solves it.

cheers,
Felipe BM
Ravikant, I have found some errors in your model. 1) Port 4 has no active boundaries. 2) In all Boundary Mode Analysis (steps 1-4) you must use a positive integer for the "Port Name". Instead you use a mixture of numbers and dots which I dont understand where they came from. Question1: are you trying to mix a symmetric and anti-symmetric mode? Question2: How do you calculate (and visualize) those effective indexes? You will need them as a shoot, in order to put that value inside the box called "Search for modes around:" Try correcting the errors above and please tell me if that solves it. cheers, Felipe BM
Felipe Beltran-Mejia
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Posted: 1 decade ago Mar 14, 2014, 4:10 p.m. EDT
Rakivant,

I had problems attaching the file using the forum interface. Please see the model I've uploaded here:

www.dropbox.com/s/l5o0xog452wo164/dual_core_2D.mph

The model is in version 4.4, if that suppose a problem I can upload snapshots of the model configuration.

I hope that makes what you are expecting.

cheers,
Felipe BM
Rakivant, I had problems attaching the file using the forum interface. Please see the model I've uploaded here: https://www.dropbox.com/s/l5o0xog452wo164/dual_core_2D.mph The model is in version 4.4, if that suppose a problem I can upload snapshots of the model configuration. I hope that makes what you are expecting. cheers, Felipe BM
Ravi
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Posted: 1 decade ago Mar 14, 2014, 8:11 p.m. EDT
Felipe
Thanks for the corrections. I'll apply these first thing tomorrow morning when I get to my lab and let you know.
Ravikant
Felipe Thanks for the corrections. I'll apply these first thing tomorrow morning when I get to my lab and let you know. Ravikant
Ravi
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Posted: 1 decade ago Mar 14, 2014, 9:01 p.m. EDT
Thanks Felipe. It works. This is what I was expecting.
Thanks Felipe. It works. This is what I was expecting.
Felipe Beltran-Mejia
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Posted: 1 decade ago Mar 15, 2014, 1:23 p.m. EDT
glad to know I was able to help you!
cheers,
Felipe BM
glad to know I was able to help you! cheers, Felipe BM
佳霖 江
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Posted: 1 decade ago Aug 20, 2014, 4:21 a.m. EDT
Hello,Ravi.
I'm a student from China.
Would you mind telling me how did you solve the problem in you model?Cause i encounter a similar problem
Thanks a lot!
Hello,Ravi. I'm a student from China. Would you mind telling me how did you solve the problem in you model?Cause i encounter a similar problem Thanks a lot!

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