[Amps] Mica cap substitute \ alternative

[Tom W8JI]

>>At the risk of straying OT, what is a good insulator at 50 
>>MHz or >?
>

> Harold  Mandel wrote:
>Steatite, (porcelain); Corning Glass, PTFE....

Ian replied:

> That is too simple a question, because the answer depends 
> on the
> application as well as the frequency.

Ian is correct. A short answer to this question sounds clear 
and definitive, but is almost always misleading. Like the 
mica statement, the answer depends heavily on the 
application AND the construction of the component where the 
material is used.

All of the things Ian pointed out are correct, but there is 
one more very important thing. The loss in any dielectric 
depends on the field density in the dielectric, not just the 
frequency.

73 Tom