Great video, thank you. Please continue to do more. I notice its been a year and just one video, don't stop, this is great video and great production, continue and you will get many more views and subs.
Congratulations on a very good instructional video. I will make one comment... At 13:00 you stated that S11 "corresponds" to Return Loss and VSWR, and you expand on the relationship with VSWR but you leave Return Loss hanging. More specifically, the relationship is with |S11|, and Return Loss = -|S11| where both are expressed in dB. The - sign is often omitted, a common error, very common in ham radio. You might consider adding a 'slide' to expand Return Loss (correctly). Well done to all involved.
Thanks for your comment! You are correct that, strictly speaking, RL = -|S11| (and you can find lots of datasheets and other resources where return loss is 'misleadingly' provided as a negative value, but unfortunately this has become a bit of a convention to some, so I didn't want to introduce a lot of confusion by giving an algebraic relation between the RL and |S11|). This is why 'corresponds to' was used instead of 'is equal to'. The reason I expanded on the relationship between |S11| and VSWR is because it is less obvious how these two quantities are mathematically related. In any case though, perhaps the "Loss (≤ 0 dB)" note may serve as a reminder that it doesn't make sense for return *loss* to be negative. :)
Apologies for the late reply - for a more detailed derivation of the power wave equations, I'd refer you to: Kurokawa, K., "Power Waves and the Scattering Matrix", IEEE Trans. Micr. Theory & Tech., Mar. 1965, pp. 194-202 (if you haven't got access, please let me know) As well as the following document: ntrs.nasa.gov/api/citations/20000056853/downloads/20000056853.pdf
An important point to understand about scattering parameters is that the reflection coefficient looking into port n is not equal to Snn unless all other ports are matched. Similarly, the transmission coefficient from port m to port n is not equal to Snm unless all other ports are matched. -- Pozar
Very well explained and I'm down with the jazz. My only critique is that you used 'reciprocal' several times before actually defining in terms of the symmetry of the S matrix. It would have been better to make that connection before the example.
Thanks for the feedback, I think you raised a good point. I tried to keep the mentions of reciprocity as minor comments to expand on what we'd expect to see in the plots, but it might indeed have been a better idea to introduce that section first, as the meaning of 'reciprocity' might not have been obvious to newcomers.
man just made the best quality high educational video ever and then quit the platform
I can never remember which subscript is input and which is output. Thanks for making this and please make more!
This was a fantastic breakdown on S-parameters. Thank you for producing it!
Please come back! You are the best!
Excellent summary on S-parameters. Thanks a million!
Great video, thank you. Please continue to do more. I notice its been a year and just one video, don't stop, this is great video and great production, continue and you will get many more views and subs.
1st time at the channel, very nice done! Are using Ansys?
Ευχαριστούμε πατριώτες, πολύ καλή εξήγηση των παράμετρων σκέδασης!
You opened my eyes. Thank you!
Great explanation, thanks. If you could also show visually what it looks like in a smith diagram that would be awesome.
Very good explanation
Love to see a smith chart video. This was a really good video.
This video was absolutely beautiful 😮💨
This video is solid gold nugget
Congratulations on a very good instructional video. I will make one comment...
At 13:00 you stated that S11 "corresponds" to Return Loss and VSWR, and you expand on the relationship with VSWR but you leave Return Loss hanging. More specifically, the relationship is with |S11|, and Return Loss = -|S11| where both are expressed in dB. The - sign is often omitted, a common error, very common in ham radio. You might consider adding a 'slide' to expand Return Loss (correctly).
Well done to all involved.
Thanks for your comment! You are correct that, strictly speaking, RL = -|S11| (and you can find lots of datasheets and other resources where return loss is 'misleadingly' provided as a negative value, but unfortunately this has become a bit of a convention to some, so I didn't want to introduce a lot of confusion by giving an algebraic relation between the RL and |S11|). This is why 'corresponds to' was used instead of 'is equal to'. The reason I expanded on the relationship between |S11| and VSWR is because it is less obvious how these two quantities are mathematically related. In any case though, perhaps the "Loss (≤ 0 dB)" note may serve as a reminder that it doesn't make sense for return *loss* to be negative. :)
@@OpenEngineeringRF Much kudos for a "well done" by Owen Duffy, he is a legend.
I actually really like the background music! Its similar to Grants videos. You are using Grants python library for these simulations, correct?
Yes, called Manim.
@@OpenEngineeringRF So you're still around?! Why aren't you making videos any more?!
Hi, thanks for the video. At 1:57, why is the voltage divided by 2 to give ai?
Apologies for the late reply - for a more detailed derivation of the power wave equations, I'd refer you to: Kurokawa, K., "Power Waves and the Scattering Matrix", IEEE Trans. Micr. Theory & Tech., Mar. 1965, pp. 194-202 (if you haven't got access, please let me know)
As well as the following document: ntrs.nasa.gov/api/citations/20000056853/downloads/20000056853.pdf
@@OpenEngineeringRF Thanks for the info!
That is one great explanatory video. Why no more?
Thank you for this video, it's very nice.
Thanks for the awesome work!, I wish if you can talk about balanced/Mixed-mode S-parameters in another video 🙂
Wow damn great videos please make more!! Εξερετική δουλεία παιδιά Μπράβο
amazingly made video.
An important point to understand about scattering parameters is that the reflection coefficient looking into port n is not equal to Snn unless all other ports are matched. Similarly, the transmission coefficient from port m to port n is not equal to Snm unless all other ports are matched. -- Pozar
I tried to note this assumption in the description.
Very well explained and I'm down with the jazz. My only critique is that you used 'reciprocal' several times before actually defining in terms of the symmetry of the S matrix. It would have been better to make that connection before the example.
Thanks for the feedback, I think you raised a good point. I tried to keep the mentions of reciprocity as minor comments to expand on what we'd expect to see in the plots, but it might indeed have been a better idea to introduce that section first, as the meaning of 'reciprocity' might not have been obvious to newcomers.
This video is amazing thank you🙏
bro did the best video ever and stopped theire
What is a power wave?
excellent video
Thank you for this
PLEASE MAKE MORE AMAZING CONTENT
The best in video parameters s
Awesome
fantastic! :D
Nice video, except the music.
Thanks. Maybe tone down the music just a wee bit.
Fantastic video, please get rid of the music as it is so distracting.
Will avoid background music next time, thanks!
The video is good, but the music is unnecessary and annoying.