For an LC series network of an high power (20KW) RF transmitter designed to resonate at 600Khz to 1.2MHZ, I compared some capacitor types.
The capacitor should be able to hold high voltages at high frequencies.
I canceled film capacitors , because they degrade the voltage blocking capacity severly wehn passing beyond 200kHZ. At 600Khz a pp film 2000V capacitor has only 60V voltage rating (datasheet wima)
The ripple current of the capacitor bank is 1200A @600KHZ
So I compared 2 types Mica and CG0/NP0 MLCC (ceramic class 1)
Which one fits best?
Mica: very expensive, but accurate, rare to find, but possible
MLCC: very economic 2000V MLCC 68pf 2000V is under 0.03euro . If I paralel 3000 of them I reach a capacitor level of 200nF @2000V with a ripple current rating of 1400A.
Downside: I am not sure how I design the creepage distance on the PCB with 1206 smd package. But if they produced it in this package I believe it should statisfy 2000V creepage distance level.
As some more experienced freaks in forum recommended mica in this forum and has not recommended MLCCs I wanted to ask what can be the downside of the MLCCs?