4 ms·
For me, an optics analogy appealed to my intuition. A transmission line is analogous to a periodic crystalline material, perhaps a form of quartz. Impedance is
by basementcat 2y ago
For me, an optics analogy appealed to my intuition. A transmission line is analogous to a periodic crystalline material, perhaps a form of quartz. Impedance is analogous to index of refraction; if two materials of differing index of refraction are juxtaposed, some of the light will reflect back. If the indices of refraction match ("impedance match") then there is no reflection and maximum energy transfer takes place.
https://en.m.wikipedia.org/wiki/Refractive_index https://en.m.wikipedia.org/wiki/Refractive_index
- marcosdumay 2y agoYeah, that's easy to work with so it's a great working model. But as an explanation, it leaves a lot to be desired. In fact, I'd say it's easier to explain optical refraction with an electrical model than the other way around.
- myth2018 2y agoThanks. I found experiments like this [0] helpful to visualize reflections and standing waves, but, like a sibling comment said, although these are similar phenomena and show what happens with the energy inside the wire, I couldn't see why these effects manifested at the electrical level. [0] - https://youtu.be/1PsGZq5sLrw https://youtu.be/1PsGZq5sLrw
- DougMerritt 2y ago> Impedance is analogous to index of refraction That's not just an analogy; impedance is index of refraction, with the same body of modern theory, except that "impedance" derives from the history of analysis of low frequency ("radio") waves whereas "index of refraction" derives from the history of analysis of high frequency ("optical") waves.