Phone
WhatsApp
Email

TECHNICAL ARTICLE

Fr4 dielectric constant and PCB board

2024-07-02 16:26  |  By: ZTELEC-www.ztelecgroup.com  |  159click

What is FR4 dielectric constant

 
The dielectric constant (Dk) of FR4, a common material used in printed circuit boards (PCBs), typically ranges from 3.8 to 4.81. This value can vary depending on several factors such as the style of the glass weave, the thickness of the material, the resin content, and the roughness of the copper foil.
 

What is pcb board

 
A Printed Circuit Board (PCB) is a mechanical base used to hold and connect the components of an electric circuit1. It’s a medium used to connect or “wire” components to one another in a circuit.
The PCB takes the form of a laminated sandwich structure of conductive and insulating layers. Each of the conductive layers is designed with a pattern of traces, planes, and other features (similar to wires on a flat surface) etched from one or more sheet layers of copper laminated onto and/or between sheet layers of a non-conductive substrate.
Electrical components may be fixed to conductive pads on the outer layers in the shape designed to accept the component’s terminals, generally by means of soldering, to both electrically connect and mechanically fasten them to it.
 

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

leave a message

If you are interested in our products, please feel free to contact us!or send email to us!Email address:sales@ztelecgroup.com

more+releated article
email whatsapp inquiry