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Eigenvalues and Eigenvectors of S-Matrix?

Question asked by fcolomb on May 21, 2004
Latest reply on Jun 29, 2004 by nilesh1

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Please- Would someone know if ADS_2003C has built-in function for determining eigenvectors and eigenvalues of S-parameter matrix?

If currently not implemented, what approach would you recommend to develop this feature?

Thank you.

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nilesh1 Jun 11, 2004 10:33 AM
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I have tried to find this in the past too. There are no inbuilt functions in ADS to do this. What are you trying to do?? Passivity checks maybe? Let me know, maybe we can do it some other way.

I'll submit an enhancement request to R&D for this.

nilesh 8)
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fcolomb Jun 14, 2004 1:12 AM
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Thank you for your reply.

To be more specific, I am analyzing multiport combiner networks. The eigenvectors represent natural modes of the combiner. In order to determine the eigenvalues and eigenvectors I export the S-matrix file to Matlab.

It would be very useful to be able to remain within ADS because I iterate the procedure many times in an optimization process.
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nilesh1 Jun 29, 2004 5:00 AM
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I have submitted an enhancement request to add this in the future. The reference number is AELexpress.751

If you wanted to add this on your own, you would write your own custom AEL expression and do all the MAtrix math inside that code to arrive at eigen values.

I found the C implementation of eigen value code online here:
http://students.cs.byu.edu/~cs521/project/code/assign3/jacobi.c
http://students.cs.byu.edu/~cs521/project/code/assign3/jacobi.h

Maybe you can use it and come up with the AEL implementation.

Thanks
nilesh 8)
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Eigenvalues and Eigenvectors of S-Matrix?

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