## [SI-LIST] Re: 2-port VNA -> 4-port VNA ?

• From: "npischl" <npischl@xxxxxxxxx>
• To: si-list@xxxxxxxxxxxxx
• Date: Fri, 06 Feb 2004 18:35:51 -0000

```Thanks for the info offered. I was trying to find a convenient way
of doing the conversion, short of having a 4-port VNA.

I found out that SoftPlot ( www.softplot.com ), a measurement data
capture, presentation, and analysis software can easily convert 2-
port results into 3-port or 4-port with one command, after 9 or 16 2-
port S-parameter measurements have been taken. It also captures and
plots data directly from 4-port VNAs, scopes, and spectrum analyzers.

I just realized this sounds as a sales pitch, but I have no interest
in SoftPlot other than using it and wish to share info that I hope
may help someone.

Neven

--- In si-list@xxxxxxxxxxxxxxx, "Shi, Wenjun" <wenjun.shi@xxxx>
wrote:
> Neven:
> You may try these equations; they should meet your requests.
> Sxy are single-ended s-parameters.
> SDD11=3D0.5*(S11-S13-S31+S33) SDD12=3D0.5*(S12-S14-S32+S34)
> SDD21=3D0.5*(S21-S23-S41+S43) SDD22=3D0.5*(S22-S24-S42+S44)
>
> SCD11=3D0.5*(S11-S13+S31-S33) SCD12=3D0.5*(S12-S14+S32-S34)
> SCD21=3D0.5*(S21-S23+S41-S43) SCD22=3D0.5*(S22-S24+S42-S44)
>
> SDC11=3D0.5*(S11+S13-S31-S33) SDC11=3D0.5*(S12+S14-S32-S34)
> SDC21=3D0.5*(S21+S23-S41-S43) SDC22=3D0.5*(S22+S24-S42-S44)
>
> SCC11=3D0.5*(S11+S13+S31+S33) SCC12=3D0.5*(S12+S14+S32+S34)
> SCC21=3D0.5*(S21+S23+S41+S43) SCC22=3D0.5*(S22+S24+S42+S44)
>
>
> Thanks & Regards,
>
> Shi, Wenjun ( Email: wenjun.shi@xxxx)
> SI Engineer
>
> -----Original Message-----
> From: si-list-bounce@xxxx [mailto:si-list-bounce@xxxx] On Behalf
Of npischl
> Sent: 2004=C7=AF2=B7=EE6=C6=FC 6:24
> To: si-list@xxxx
> Subject: [SI-LIST] 2-port VNA -> 4-port VNA ?
>
> Does anyone know if there is an available conversion routine (e.g.
> Excel, Mathad, web-based.....), that would help me convert
multiple
> 2-port VNA S-parameters obtained on a 4-port DUT (measure all
> combinations of two-ports while the other ports are terminated)
and
> convert them into 4-port mixed-mode S-parameters?
>
> I am especially interested in SCC21 and SDC21 (CM-CM transfer and
CM-
> DM conversion). I cannot use TDR/TDT because I need at least -60
dB
> sensitivity.
>
> Thank you, Neven
>
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```