Does the raw data from VNA,or already being pre-processed?

[542537372]

Thanks for your contribution!
I have a question when I learning this code,
I try to put my simulation data from HFSS to MERIT, but failed,
I guess the raw data are not from VNA, but already made some pre-process?

What kind of the data is used in MERIT?
Does the data is S-parameter from VNA?

Thanks a lot !

[TeaRipple]

Thanks for you question! I did not put data from HFSS to MERIT, but data from COMSOL , CST and VNA. The results show me good image. Thus, I think the codes are excellent for DAS algorithm. Good luck!

…

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----------原邮件信息---------- 发件人："542537372" ***@***.***> 收件人："EMFMed/MERIT" ***@***.***> 抄送人："Subscribed" ***@***.***> 主题：[EMFMed/MERIT] Does the raw data from VNA,or already beingpre-processed? (Issue #16) 发送时间：2025-11-05 11:18:22 542537372 created an issue (EMFMed/MERIT#16) Thanks for your contribution! I have a question when I learning this code, I try to put my simulation data from HFSS to MERIT, but failed, I guess the raw data are not from VNA, but already made some pre-process? What kind of the data is used in MERIT? Does the data is S-parameter from VNA? Thanks a lot !

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[542537372]

Thanks for you question! I did not put data from HFSS to MERIT, but data from COMSOL , CST and VNA.
The results show me good image. Thus, I think the codes are excellent for DAS algorithm.

Good luck!
…

Thanks for your reply!
I know CST can get S-parameter, and get 1-D output signal in time domain,
(VNA can get S-para and TDR time signal as well)
I guess in CST simulation, the data is 1-D output data from different discrete port in time domain ,
but I am not sure because there is a frequencies.csv which include frequent list instead of time-step list,

The raw data is 72 freq * 96 channels , so I guess this is S-param?
But most paper use time domain signal to subtract reference signal,
at lease they use IFFT to get time domain signal from S-param.
is it possible to make substraction with S-param?

can you give me a tip about the raw data property?
Which kind of raw CST data is used in MERIT?
Time domain signal , or S-param in different freq?

Thanks a lot !

[TeaRipple]

It is S-parameter.

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----------原邮件信息---------- 发件人："542537372" ***@***.***> 收件人："EMFMed/MERIT" ***@***.***> 抄送人："TeaRipple" ***@***.***>, "Comment" ***@***.***> 主题：Re: [EMFMed/MERIT] Does the raw data from VNA,or already beingpre-processed? (Issue #16) 发送时间：2025-11-17 20:08:10 542537372 left a comment (EMFMed/MERIT#16)

Thanks for you question! I did not put data from HFSS to MERIT, but data from COMSOL , CST and VNA. The results show me good image. Thus, I think the codes are excellent for DAS algorithm. Good luck! […](#)

Thanks for your reply! So the data is S-parameter from different CST port, or time domain output signal from different discrete port?

…

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[542537372]

It is S-parameter.

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发送时间：2025-11-17 20:08:10

542537372 left a comment (EMFMed/MERIT#16)
Thanks for you question! I did not put data from HFSS to MERIT, but data from COMSOL , CST and VNA.
The results show me good image. Thus, I think the codes are excellent for DAS algorithm.

Good luck!
…
Thanks for your reply!
So the data is S-parameter from different CST port, or time domain output signal from different discrete port?
…

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Reply to this email directly or view it on GitHub:
#16 (comment)
You are receiving this because you commented.

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Thanks for your reply!

Oh, I get it !
I found in the codes ,freq domain need to calculate a complex value which related to delay to change phase.
In freq domain:
S_delay = S * exp^(-2 * pi * delaytime);

But I have a little more question , is this calculation above is equivelent of time domain delay process ?
In time domain:
S_delay(t) = S(t - delaytime)

Does the two formular above are equivelent ? Although they are same in FFT, but I still not sure...
Thanks a lot for your guidance!

[TeaRipple]

You are welcome! Yes, it is necessary to make substraction. Good luck！

…

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----------原邮件信息---------- 发件人："542537372" ***@***.***> 收件人："EMFMed/MERIT" ***@***.***> 抄送人："TeaRipple" ***@***.***>, "Comment" ***@***.***> 主题：Re: [EMFMed/MERIT] Does the raw data from VNA,or already beingpre-processed? (Issue #16) 发送时间：2025-11-18 09:23:00 542537372 left a comment (EMFMed/MERIT#16)

It is S-parameter. ---------------- ----------原邮件信息---------- 发件人："542537372" ***@***.***> 收件人："EMFMed/MERIT" ***@***.***> 抄送人："TeaRipple" ***@***.***>, "Comment" ***@***.***> 主题：Re: [EMFMed/MERIT] Does the raw data from VNA,or already beingpre-processed? (Issue [#16](#16)) 发送时间：2025-11-17 20:08:10 542537372 left a comment ([EMFMed/MERIT#16](#16)) Thanks for you question! I did not put data from HFSS to MERIT, but data from COMSOL , CST and VNA. The results show me good image. Thus, I think the codes are excellent for DAS algorithm. Good luck! […](#) Thanks for your reply! So the data is S-parameter from different CST port, or time domain output signal from different discrete port? […](#)

[542537372]

Thanks a lot for your guidance !
I will cite this paper if I finished mine!