Electronics tutorial - Resistive (lossy) impedance matching

#92 In this video I want to take a look at what happens when you don't account for different impedance traces. What could possibly go wrong, but also what can be done about it. In particular I look at resistive impedance matching circuits - sounds fancy but its just a couple resistors...

Obs - at 10:01 in the formula for Rs the fractions under the square root are reversed - its supposed to be Z2 over Z1.

Previously on the topic:

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[Masoudmpo]

Thanks for these contents. I really like your video format. Clearly explaining the problem followed by simulation and test setup. You are now my go to channel for RF and electronics next to w2aew.

[Fr]

You made important concepts much clearer, where every other video or website i saw did not, despite loads of text. Thank you very much!

[juanchirino]

Excellent approach to the topic, i study this at university in the subject " electric-network theory 2", but the approach was the other way around, first we study dual port networks L type, and the an application of this was impedance matching.
Those experiment helped me to understand better the topic cos to the fact that this year laboratories was closed for the COVID-19 pandemic.
Saludos desde Argentina!!

[Electronzap]

Good video, impedance matching makes a lot more sense now.

[EmmanuelR]

Very nice video. You're dealing with a problem I find rather complex. I didn't realize until watching your video that LTSpice could simulate propagation in wires.
I would just do one remark. When you add a resistor in parallel to an other one to match the cable impedance, it is worth mentionning that it works only because the two resistors are close enough from each other compared to the wavelength. Otherwise, we're faced to an other transmission line between the two resistors. That's the only point that was not clear to me.

[__--JY-Moe--__]

I have 2 be aware of impedance matching, with my base station networks! a very important complication, in RF. a very helpful full lecture video!! best regards!

[gillywild]

Excellent stuff :) I learned a lot. Thank you :)

[TheSriram]

Excellent video.One small suggestion_> you can share the Ltspice simulation file with every video

[samruthkrishna]

What is the symbol you have used for replicating transmission lines in LT spice?

[visai]

I tried to calculate the formula for Rs and Rp, it turns out that Rs = √(Z2^2 - Z1*Z2). Mistakes could happen thought i would point out here. Rp is same as shown in video.

[bejancornel]

Hello,

It is possible to model and simulate stubs in LTspice?
If it is possible, can you model and simulate stubs in LTspice in future videos?

Thank you.

[yveslesage]

What is the source impedance (I mean generator impedance) ? None, 50, 75 ?