3 ms·
Wonder how impedance control is with paper in lieu of FR-4.
by cushychicken 5y ago
Wonder how impedance control is with paper in lieu of FR-4.
- dhdc 5y agoProbably non-existent since the thickness of insulation layer isn't controlled. Surprisingly, silicone rubber has a dielectric constant between 2 and 4 [1], which is pretty close to FR-4's 4.4. So maybe it isn't impossible? [1]https://res.mdpi.com/d_attachment/polymers/polymers-09-00533/article_deploy/polymers-09-00533-v2.pdf https://res.mdpi.com/d_attachment/polymers/polymers-09-00533...
- xondono 5y agoProbably quite poor. FR4 boards are built with woven fibers, and you can get measurable differences depending on how tight the weave pattern is, or the angle of your transmission line relative to the weave pattern. Given that paper is not woven, I’d expect a lot more dispersion than on cheap PCBs. That said, with a good enough process able to press the paper + resin stack reliably, you could possibly get something usable.