combining 2 s2p to make s3p for a diplexer

[Tushar Shenoy]

I'm working with a COTS diplexer.  I have 2 s2p files from the COM->RX and COM-TX port from the vendor but they do not have the RX->TX data, so I cannot easily use the combine n port function to generate the S3P file.  Given the fact that the isolation between the RX->TX is high (-70 dB), I figure there should be a way to approximate the 3 port response.  I could create a synthesized RX->TX response assuming S12 and S21 are -70 dB (and S11, S22 are from the 2 s-parameter files I have), but is there an easier way to do this?  

thanks!

-Tushar

[Julien Hillairet]

Dear Tushar,

I think the simplest is indeed to create a three ports Network, then to fill the s parameters from your knowledge.

Julien

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[Tushar Shenoy]

Thanks Julien, I was afraid I would just have to brute force it like that. It might just be less effort to measure the unit properly! 

Thanks! 

-Tushar

——

Tushar Shenoy

On Aug 12, 2022, at 10:52, Julien Hillairet <julien.h...@gmail.com> wrote:



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