Copper Capacitor Plates

[KL7AJ]

Eric, I am interested in what they do the the construction of capacitors to give them a negative temperature coefficient and or the NPO charastics.
Ned

There are a few exotic ceramic materials that have a negative temperature coefficient, but they are also quite lossy compared to the "normal" capacitors. This is why they are very difficult to get these days. Although, I imagine with all the newfangled composite materials, this might not be the case, if the demand were there.

Eric

[AC0FP]

There are a few exotic ceramic materials that have a negative temperature coefficient, but they are also quite lossy compared to the "normal" capacitors. This is why they are very difficult to get these days. Although, I imagine with all the newfangled composite materials, this might not be the case, if the demand were there.

Eric

Low loss Hi-Q ceramic chip capacitors are readily available with many different temperature coefficients today, mainly negative. I've been using negative coefficient disc ceramics for years to compensate oscillators.

fp