Burried capacitor in PCB
Hi,
If you have for example a multi layer board, usually you can apply between two layers (GND & some supply voltages)a very thin internal layer (basic material of for ex.) 100um thickness, and calculate as a normal capacitor with plate surface of Xcm x Ycm & distance (thickness of dielectricum) 100umeter...
Epsilon-rel is of FR4 (typical_hell brown_ PCB material) so at 4.5, you will realize: its value is not so high_may be par teens to hundred picofarad.
K.