Fr4 dielectric constant and PCB board

FR-4 material, which is the abbreviation of epoxy resin fiberglass cloth, it is a kind of circuit board raw material and base material, which refers to a grade of flame-resistant material, which means that the resin material must be able to extinguish itself after burning. a material specification. Most commonly used in PCB (printed circuit board), general single, double-sided and multi-layer PCB circuit boards are made of this! Because of its high strength and flame retardancy, most circuit boards will choose FR-4 as the substrate. In this article, we mainly talk about the effect of fr4 dielectric constant on circuit boards.

The dielectric constant of fr4 affects how fast the circuit board transmits signals

There is a dielectric constant in the circuit board, what does this mean? This is equivalent to air resistance when you walk. This dielectric constant affects how fast the medium can transmit signals. The circuit board generally uses FR4, and the dielectric constant of FR4 is between 4.2-4.7. The smaller the dielectric constant, the faster the signal transmission. The transfer speed is inversely proportional to the square root of the dielectric constant.

FR-4 dielectric constant affects circuit board signal impedance

The dielectric constant can affect the impedance of the line, and as the dielectric constant changes, the impedance will change accordingly. Impedance has a great effect on many high-speed signals. Especially radio frequency communication signals. Impedance mismatch, signal quality is much poorer.

The dielectric constant of Fr4 will change in different environmentsFR-4 material, which is the abbreviation of epoxy resin fiberglass cloth, it is a kind of circuit board raw material and base material, which refers to a grade of flame-resistant material, which means that the resin material must be able to extinguish itself after burning. a material specification. Most commonly used in PCB (printed circuit board), general single, double-sided and multi-layer PCB circuit boards are made of this! Because of its high strength and flame retardancy, most circuit boards will choose FR-4 as the substrate. In this article, we mainly talk about the effect of fr4 dielectric constant on circuit boards.

The dielectric constant of fr4 affects how fast the circuit board transmits signals

There is a dielectric constant in the circuit board, what does this mean? This is equivalent to air resistance when you walk. This dielectric constant affects how fast the medium can transmit signals. The circuit board generally uses FR4, and the dielectric constant of FR4 is between 4.2-4.7. The smaller the dielectric constant, the faster the signal transmission. The transfer speed is inversely proportional to the square root of the dielectric constant.

FR-4 dielectric constant affects circuit board signal impedance

The dielectric constant can affect the impedance of the line, and as the dielectric constant changes, the impedance will change accordingly. Impedance has a great effect on many high-speed signals. Especially radio frequency communication signals. Impedance mismatch, signal quality is much poorer.

The dielectric constant of Fr4 will change in different environmentsThe circuit board transmits the signal fastest in vacuum air, and the dielectric constant is 1.0. The dielectric constant of water is 70. As long as there is a little water in the board, the dielectric constant will be much higher. Therefore, when we buy fr4, we must consider the parameter values ​​required by the product in different use environments.

Dielectric constant of Fr4 at different thicknesses

FR-4 sheet-ZTelec Group

The dielectric constant of Fr4 is an important parameter for the circuit board. When purchasing, you must choose a manufacturer with stable quality, so as to be less troublesome in the later stage. ztelecgroup has been engaged in the production and sales of fr4 sheets for decades. It has a mature product production process, reliable quality inspection certificates, and rich experience in product sales and after-sales. Welcome to consult.

Contact us for free samples. sales@ztelecgroup.com