A Visual Introduction to Scattering Parameters

Рет қаралды 21,468

2 жыл бұрын

This video covers the fundamental theory surrounding S-Parameters, and their applications to RF networks.
Chapters:
0:00 - Introduction
0:34 - What is a 'Network'?
1:52 - Power Waves
2:30 - Complex Impedance & Phase Angle
3:06 - S-Matrix & S-Parameters
4:19 - Reflection & Transmission Coefficients
6:03 - Standing Waves
7:00 - Example Networks
12:25 - Designating S-Parameters
13:01 - Reciprocity & Losslessness
13:42 - Reflection Coefficient and VSWR
14:28 - Conclusion
(Note: At 4:07, Sij is equal to (Vi-/Vj+) * sqrt(Zj)/sqrt(Zi), but because we've assumed an equal impedance for all ports, it has been simplified to Vi-/Vj+.)
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The source code used to generate this video can be found on the GitHub repository: github.com/0xCoto/OpenEnginee...
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Special thanks to Athanasios Kanatas, Dimitrios Rongas, Leonidas Marantis, and Cameron Van Eck for their thorough guidance and consistent support.

Пікірлер: 41

@artsonpl9821 20 күн бұрын

Please come back! You are the best!

@scirip2280 Ай бұрын

man just made the best quality high educational video ever and then quit the platform

@DahliaTrimble 2 жыл бұрын

I can never remember which subscript is input and which is output. Thanks for making this and please make more!

@microharmonics6186 2 жыл бұрын

This was a fantastic breakdown on S-parameters. Thank you for producing it!

@damarantes7583 Жыл бұрын

Excellent summary on S-parameters. Thanks a million!

@plaksyuk 2 жыл бұрын

You opened my eyes. Thank you!

@brunobarajas 10 ай бұрын

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.

@poxilos 5 ай бұрын

Ευχαριστούμε πατριώτες, πολύ καλή εξήγηση των παράμετρων σκέδασης!

@Who5tealmynamE Жыл бұрын

This video is solid gold nugget

@JB-123 9 ай бұрын

Love to see a smith chart video. This was a really good video.

@El650Jefe Жыл бұрын

This video was absolutely beautiful 😮‍💨

@goodchange124 Жыл бұрын

Thank you for this video, it's very nice.

@ZectricFOZ Жыл бұрын

amazingly made video.

@Laura-Yu Жыл бұрын

This video is amazing thank you🙏

@katyar4883 Жыл бұрын

Thank you for this

@xxgoku7774 2 жыл бұрын

excellent video

@elfeituri Жыл бұрын

Thanks for the awesome work!, I wish if you can talk about balanced/Mixed-mode S-parameters in another video 🙂

@andreasskaliontas6380 11 ай бұрын

Wow damn great videos please make more!! Εξερετική δουλεία παιδιά Μπράβο

@oleksiishekhovtsov1564 Жыл бұрын

fantastic! :D

@dbharathi2003 Жыл бұрын

Awesome

@uav-pixel9046 Жыл бұрын

PLEASE MAKE MORE AMAZING CONTENT

@thomasknapp7807 2 ай бұрын

That is one great explanatory video. Why no more?

@OwenDuffy 2 жыл бұрын

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.

@OpenEngineeringRF 2 жыл бұрын

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. :)

@davidlewis1375 2 жыл бұрын

@@OpenEngineeringRF Much kudos for a "well done" by Owen Duffy, he is a legend.

@omarakdh-xp4eo 5 ай бұрын

The best in video parameters s

@mengxinlin9580 Жыл бұрын

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

@OpenEngineeringRF Жыл бұрын

I tried to note this assumption in the description.

@jackroche5060 4 ай бұрын

I actually really like the background music! Its similar to Grants videos. You are using Grants python library for these simulations, correct?

@OpenEngineeringRF 4 ай бұрын

Yes, called Manim.

@Astartos22 Жыл бұрын

Hi, thanks for the video. At 1:57, why is the voltage divided by 2 to give ai?

@OpenEngineeringRF Жыл бұрын

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

@Astartos22 Жыл бұрын

@@OpenEngineeringRF Thanks for the info!

@gravmath Жыл бұрын

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.

@OpenEngineeringRF Жыл бұрын

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.