ATLC (http://atlc.sourceforge.net/) appears to be good #opensource tool to design unusual PCB (micro)strip lines. But slow. P.s. Images of simulated 100 Ω edge coupled embedded #microstrip included.
Physicist. Electronics engineer.
My native language is Russian. I also speak English and learn Japanese.
I play go (baiduk, weiqi) sometimes.
I use GPG for communication. Here's one of my keys.
http://keys.gnupg.net/pks/lookup?op=get&search=0x7DFB28AF9D7FC805 (Fingerprint: 7F54 6214 03B7 6C00 8365 7F3E 7DFB 28AF 9D7F C805)
Other fediverse accounts:
@vovanium — active Friendica
@vovanium — some crap. mainly inactive