PCB trace as a wave guide

[@lukbrowncs]

9:14 was very cool, using the stitching capacitor to help transition the signal return path from GND1 plane to the bottom Pwr plane and then back up to the GND1 plane. Despite them being at different potentials it was instructive to learn that this would work.

[@KmManju-cw7bf]

Very nice explanation.....

[@Graham_Wideman]

2:30 "Conduction current is the travel of an electron from the positive terminal, through the load". You have it backwards. In the direction from battery plus to battery minus, current will be positive, that is true. That positive current is constituted from electrons carrying negative charges from negative terminal to positive. The negative terminal is called the negative terminal because it has a surplus of negative charges.

[@haideralikhan5947]

Nice guide, thanks

[@이영남이영남-e9l]

Many thanks!!

[@maximus6884]

Thanks TI

[@JoannaPirieHill]

The return current of a Transmission Line flows through a distance. Hence there is inductance through this path and it should be shown. Not showing this inductance unintentionally teaches that ground is ideal. The ground path is never ideal. The Ideal Ground concept is often taught as it is here in your video. It must be first unlearned to be successful at EMC and EMI.

[@arthurkay3151]

That’s a good point. I will have to think about that for future updates.

[@AlbertRei3424]

In the mean time, datasheets only talks about ESR, and you get insulted when you try to teach that to your senior low speed engineer....

[@NA-ms8rl]

TI is best...

[@bassome3000ify]

So cewl thx

[@alan262]

Your analogy to water flowing is incorrect. That is, you cannot think of electrons bumping into each other and creating a displacement current down the middle of the wire. See J.D. Jackson's paper (1996), youtube lectures for " Matter and Interactions" (lecture EM12) As well as a paper by Jefimmenko. When the wire is extremely clean and very, very small we can talk about the electron wave.

[@laurens4359]

Calling this a "wave guide" goes against the common definition. The term "wave guide" or "waveguide" for electromagnetics is applicable (only) to TE / TM modes of propagation. Microstrip is (quasi)-TEM - with different boundary conditions and hence not a "wave guide" (until your dielectric thickness becomes an appreciable part of the frequency of interest)