Introduction to the dielectric constant of FR4 board
2020-09-03
he dielectric constant of PCB is generally 4.2-4.7 relative to air at room temperature, but this value usually changes with temperature changes. Generally speaking, the maximum change value can be in the temperature range of 0-70 degrees. Reach between 20%. The change of the dielectric constant will cause the delay of the line to change, reaching about 10%, and the higher the temperature, the greater the delay. And it also changes with the frequency, the higher the frequency, the lower the dielectric constant.
