Hello Community,
I read a few notes about the dielectric properties of the material FR-4, as well as feedback from the developers, but I could not figure out what frequency is the maximum for the material FR-4. Someone says that it is 5GHz, someone does even up to 10GHz (which I consider to be fundamentally wrong, since there is a special material for such frequencies), and someone draws direct ratios of frequency to dielectric constant, for example:
f.max - Dk.
2500 (MHz) - 4.3 (Dk)
3000 (MHz) - 4.6 (Dk)
Source:
RF Circuit design (Richard C. Li) - page 10
How can I understand the frequency limit for my material (FR4), if it has the following properties:
1. Core (0,508mm, Dk: 4,58, Df: 0,022)
2. Prepreg (0,076mm, Dk: 3,9, Df: 0,022)
P.S.
The maximum frequency I use is about 2600MHz.
The question is relevant for those who want to know everything and why everything is exactly as it is. But all the materials that I found are very deep in physical properties, scientific studies, etc. It would be cool to hear something in between, as your experts can do. Thanks TI!
