Read s2p Z parameter files in Python

Puneet Jain

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Jun 23, 2022, 2:18:45 PM6/23/22

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I am trying to read s2p files in using Python scikit-rf library. The s2p file in not in S parameter. I converted it to Z parameter. Looks like scikit-rf can read only S parameter file. Is there any other library or way to read s2p files with Z parameter. Below is how I am reading the file:

import skrf as rf

ntwk = rf.Network('ZTEST5_SHORTED.s10p')

s = ntwk.s print(s)

Below is the error:

Traceback (most recent call last): File "C:\Users\pujai\PycharmProjects\SIIntegration\practice.py", line 26, in <module> ntwk = rf.Network('ZTEST5_SHORTED_DCfitted.s10p') File "C:\Users\pujai\PycharmProjects\SIIntegration\venv\lib\site-packages\skrf\network.py", line 457, in __init__ self.read_touchstone(filename, self.encoding) File "C:\Users\pujai\PycharmProjects\SIIntegration\venv\lib\site-packages\skrf\network.py", line 2050, in read_touchstone raise NotImplementedError('only s-parameters supported for now.') NotImplementedError: only s-parameters supported for now.

If I try to read an S parameter file, it works fine. Any help?

Puneet Jain

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Jun 23, 2022, 3:46:32 PM6/23/22

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Here is a snippet from the file:

# MHz Z MA R 1
0 10676.9217266929 -89.9996922763017 21.8057273267468 -90.0020463959989 51.2822443115442 -90.0001796805383 51.2822443139193 -90.0001913484415
51.2822443092998 -90.000353348531 51.2822443194682 -90.0004686439498 51.2822443930106 -90.000550007965 51.2822442696319 -90.0000948159687
6.97916690350401 89.9998344901134 6.97916691190284 89.9986375129139
21.8057273104465 -90.0020464107003 63754.6007953583 89.9981705059089 20.6101518076135 90.0041095770662 20.6101517339149 89.999990857772
20.6101516951136 89.9980338593023 20.6101516965512 89.9982869729047 20.6101517268438 89.9991377329278 20.6101517071014 89.998753887922
0.621172783655873 -89.9822306398258 0.621172812583443 -89.976139722965
51.2822443061024 -90.0001797181979 20.610151252399 90.004109014424 1889.84663829441 -89.9991386658517 1889.84663831083 -89.9991524638532
1889.84663835269 -89.9992005745209 1889.84663833721 -89.9991774317595 1889.84663785683 -89.9992933431628 1889.84663795451 -89.9992697366806
42.3883012605096 90.0056833234696 42.3883011851481 90.0055121758161
51.2822443084774 -90.000191386101 20.6101511787261 89.9999902950379 1889.84663831083 -89.9991524638532 1889.84663832319 -89.9991346737575
1889.84663836817 -89.9991979388386 1889.84663835328 -89.9991743791286 1889.84663786705 -89.9992894882182 1889.84663797014 -89.9992663366631
42.3883012618417 90.0056460941817 42.3883011863982 90.0054749465282
51.2822443038578 -90.0003533861906 20.6101511399333 89.9980332965163 1889.84663835267 -89.9992005745209 1889.84663836816 -89.9991979388386
1889.84663844745 -89.9992060956688 1889.84663842919 -89.9991944418949 1889.84663792613 -89.9993174098777 1889.84663803201 -89.9992900406004
42.3883012345506 90.0050947810637 42.3883011616751 90.0049600976616
51.2822443140278 -90.0004686816089 20.6101511413649 89.9982864101169 1889.84663833725 -89.9991774317595 1889.84663835331 -89.9991743791287
1889.84663842924 -89.9991944418949 1889.84663840981 -89.999156770148 1889.84663790361 -89.9992904883582 1889.84663801847 -89.9992585876496
42.3883012986792 90.0061517302031 42.3883012189043 90.0060170468036
51.2822443875694 -90.0005500456245 20.6101511716603 89.9991371701763 1889.84663785686 -89.9992933431628 1889.84663786708 -89.9992894882182
1889.84663792616 -89.9993174098777 1889.8466379036 -89.9992904883582 1889.84663743521 -89.9993913543685 1889.84663762473 -89.9993796397999
42.3883011783852 90.0049118622332 42.3883011060572 90.0047036801252
51.2822442641889 -90.0000948536285 20.6101511519151 89.9987533251306 1889.84663795446 -89.9992697366806 1889.8466379701 -89.9992663366632
1889.84663803198 -89.9992900406004 1889.84663801839 -89.9992585876496 1889.84663762466 -89.9993796397999 1889.8466376412 -89.9993421525407
42.3883011908417 90.0054688790319 42.3883011186086 90.0052606969267
6.97916690335969 89.9998343192217 0.621171596913012 -89.982270102364 42.3883012987864 90.0056831034319 42.3883013001192 90.0056458741442
42.3883012728306 90.0050945610262 42.3883013369573 90.0061515101649 42.3883012166644 90.0049116421959 42.3883012291213 90.0054686589943
5281.89056273623 -89.9999867646875 5281.89056272443 -89.9999841097774
6.97916691175836 89.9986373420223 0.621171625788863 -89.9761791738575 42.3883012234252 90.0055119557792 42.388301224676 90.0054747264914
42.3883011999552 90.0049598776248 42.3883012571825 90.006016826766 42.3883011443368 90.0047034600886 42.3883011568886 90.0052604768899
5281.89056272444 -89.9999841097774 5281.89056270833 -89.9999287234814
1e-07 10676.9217266929 -89.9996922763017 21.8057273267468 -90.0020463959989 51.2822443115442 -90.0001796805383 51.2822443139193 -90.0001913484415
51.2822443092998 -90.000353348531 51.2822443194682 -90.0004686439498 51.2822443930106 -90.000550007965 51.2822442696319 -90.0000948159687
6.97916690350401 89.9998344901134 6.97916691190284 89.9986375129139
21.8057273104465 -90.0020464107003 63754.6007953583 89.9981705059089 20.6101518076135 90.0041095770662 20.6101517339149 89.999990857772
20.6101516951136 89.9980338593023 20.6101516965512 89.9982869729047 20.6101517268438 89.9991377329278 20.6101517071014 89.998753887922
0.621172783655873 -89.9822306398258 0.621172812583443 -89.976139722965
51.2822443061024 -90.0001797181979 20.610151252399 90.004109014424 1889.84663829441 -89.9991386658517 1889.84663831083 -89.9991524638532
1889.84663835269 -89.9992005745209 1889.84663833721 -89.9991774317595 1889.84663785683 -89.9992933431628 1889.84663795451 -89.9992697366806
42.3883012605096 90.0056833234696 42.3883011851481 90.0055121758161
51.2822443084774 -90.000191386101 20.6101511787261 89.9999902950379 1889.84663831083 -89.9991524638532 1889.84663832319 -89.9991346737575
1889.84663836817 -89.9991979388386 1889.84663835328 -89.9991743791286 1889.84663786705 -89.9992894882182 1889.84663797014 -89.9992663366631
42.3883012618417 90.0056460941817 42.3883011863982 90.0054749465282
51.2822443038578 -90.0003533861906 20.6101511399333 89.9980332965163 1889.84663835267 -89.9992005745209 1889.84663836816 -89.9991979388386
1889.84663844745 -89.9992060956688 1889.84663842919 -89.9991944418949 1889.84663792613 -89.9993174098777 1889.84663803201 -89.9992900406004
42.3883012345506 90.0050947810637 42.3883011616751 90.0049600976616
51.2822443140278 -90.0004686816089 20.6101511413649 89.9982864101169 1889.84663833725 -89.9991774317595 1889.84663835331 -89.9991743791287
1889.84663842924 -89.9991944418949 1889.84663840981 -89.999156770148 1889.84663790361 -89.9992904883582 1889.84663801847 -89.9992585876496
42.3883012986792 90.0061517302031 42.3883012189043 90.0060170468036
51.2822443875694 -90.0005500456245 20.6101511716603 89.9991371701763 1889.84663785686 -89.9992933431628 1889.84663786708 -89.9992894882182
1889.84663792616 -89.9993174098777 1889.8466379036 -89.9992904883582 1889.84663743521 -89.9993913543685 1889.84663762473 -89.9993796397999
42.3883011783852 90.0049118622332 42.3883011060572 90.0047036801252
51.2822442641889 -90.0000948536285 20.6101511519151 89.9987533251306 1889.84663795446 -89.9992697366806 1889.8466379701 -89.9992663366632
1889.84663803198 -89.9992900406004 1889.84663801839 -89.9992585876496 1889.84663762466 -89.9993796397999 1889.8466376412 -89.9993421525407
42.3883011908417 90.0054688790319 42.3883011186086 90.0052606969267
6.97916690335969 89.9998343192217 0.621171596913012 -89.982270102364 42.3883012987864 90.0056831034319 42.3883013001192 90.0056458741442
42.3883012728306 90.0050945610262 42.3883013369573 90.0061515101649 42.3883012166644 90.0049116421959 42.3883012291213 90.0054686589943
5281.89056273623 -89.9999867646875 5281.89056272443 -89.9999841097774
6.97916691175836 89.9986373420223 0.621171625788863 -89.9761791738575 42.3883012234252 90.0055119557792 42.388301224676 90.0054747264914
42.3883011999552 90.0049598776248 42.3883012571825 90.006016826766 42.3883011443368 90.0047034600886 42.3883011568886 90.0052604768899
5281.89056272444 -89.9999841097774 5281.89056270833 -89.9999287234814

Its a 10*10 matrix. I am posting only two frequencies here to make it short.

Puneet Jain

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Jun 23, 2022, 6:44:44 PM6/23/22

to scikit-rf

Can someone please tell me if its possible or not? All I am looking for is a way to parse this data and have it in an array. I don't need to perform any other operations on it. I

jeanbiego

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Jun 23, 2022, 9:22:24 PM6/23/22

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Hi,

I have not tried converting the pasted text to a numpy array because of the difficulty, but if you can do that, the following could be used.

skrf.network.Network.from_z

skrf.network.z2s

2022年6月24日金曜日 7:44:44 UTC+9 punit.ja...@gmail.com:

vinc0110

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Jun 24, 2022, 12:56:52 AM6/24/22

to scikit-rf

As you already mentioned, scikit-rf can currently only read S parameters from a Touchstone file, see source code here: https://github.com/scikit-rf/scikit-rf/blob/ba3b0a7f391838dabaa6c122db1a8e28067e9494/skrf/network.py#L2049-L2050

I don't know the reason, because the file format obviously supports other parameters as well. It looks like you have to parse the file yourself or find another library that can do it. The Touchstone format is pretty simple though: http://www.ibis.org/touchstone_ver2.0/touchstone_ver2_0.pdf

Julien Hillairet

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Jun 24, 2022, 1:43:23 AM6/24/22

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Indeed scikit-rf does not support Touchstone files with other data than S yet. (and to be honest this is the first time I see such file. Where does it come from?)

If you want to contribute to the project, you can start by submitting an issue on github.

Otherwise, there is eventually a possible hack to test:

# replace 'Z' with 'S' in your s10p file

dummy = rf.Network('test.s10p')

ntwk = rf.Network(z=dummy.s, frequency=dummy.frequency)

Julien

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