Hi, I was checking the transline calculator from KiCad and found no documentation about the models used there. In the forums, Seth_h pointed to a few of them:
- microstrip: H. A. Atwater, “Simplified Design Equations for Microstrip Line Parameters”, Microwave Journal, pp. 109-115, November 1989 (info from [here](https://forum.kicad.info/t/microstrip-formulas-in-pcb-calculator/9861)) - coupled microstrip line: “Accurate Wide-Range Design Equations for the Frequency-Dependent Characteristic of Parallel Coupled Microstrip Lines” (http://ieeexplore.ieee.org/abstract/document/1132616/) (info from [here](https://forum.kicad.info/t/differential-pair-into-pcb-calculator/7390/5)) but in the source of this calc there are 5 references for the microstrip, just grep ref in /pcb_calculator/transline/c_microstrip.cpp to see them. I'm confused about it. What are the references of the other models? I can add that to the docs, but I don't know what are them... Kind regards, Heitor
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