Printed Circuit Board Laminate Substrate Selection should take the dielectric constant effect into consideration:
The substrates of printed circuit boards are divided into two categories: organic and inorganic. The most important property in the substrate is the dielectric constant, (Affects the impedance of the circuit and the transmission rate of the signal), dissipation factor (or dielectric loss) tan8.
Coefficient of thermal expansion CET and moisture absorption rate:
Where e affects the circuit impedance and signal transmission rate. For high-frequency circuits, the dielectric constant is The difference is the more critical factor to be considered first, and the substrate with small dielectric constant tolerance should be selected.
