The Characteristics of High-Frequency PCB​

The Characteristics of High-Frequency PCB

(1) The dielectric constant (Dk) must be small and stable, usually the smaller the better. The signal transmission rate is proportional to the square root of the material dielectric constant, high dielectric constant is likely to cause signal transmission delay.
(2) Dielectric loss (Df) must be small, which mainly affects the quality of signal transmission, the smaller dielectric loss, the signal loss is also smaller.
(3) The thermal expansion coefficient should be close to copper foil as much as possible, because inconsistencies in the hot and cold changes will cause copper foil separation.
(4) low water absorption will affect the dielectric constant and dielectric loss when be damp.
(5) Other heat resistance, chemical resistance, impact strength, peel strength, etc. must also be good.

High frequency PCB characteristics

1. The impedance control requirements are relatively strict, and the relative line width control is very strict, with a general tolerance of about 2%.

2. Due to the special plate material, the adhesion of PTH during copper sinking is not high. It is usually necessary to roughen the vias and the surface with the help of plasma processing equipment to increase the adhesion of PTH hole copper and solder mask ink.

3. Do not grind the board before doing solder mask, otherwise the adhesion will be poor, and only use micro-etching potion to roughen it.

4. Most of the plates are polytetrafluoroethylene materials, and there will be a lot of burrs when molding with ordinary milling cutters, and special milling cutters are required.

5. High-frequency circuit boards are special circuit boards with higher electromagnetic frequencies. Generally speaking, high-frequency can be defined as frequencies above 1GHz.

Its various physical properties, accuracy, and technical parameters require very high requirements, and are often used in automotive anti-collision systems, satellite systems, radio systems and other fields.

High-Frequency PCB High-frequency circuit boards with induction heating technology have been widely used in the communication industry, network technology field promotion and high-speed information processing systems, meeting the requirements of many high-precision parameter instruments. Reliable high-frequency circuit boards provide great help in actual production. So, what are the advantages of such a powerful high-frequency PCB?

1. High-Frequency PCB has high efficiency

High-frequency PCB with low dielectric constant will have low loss, and advanced induction heating technology can achieve the target heating demand with very high efficiency. Of course, while focusing on efficiency, it also has the characteristics of environmental protection, which is very suitable for the development direction of today's society.

 2. High frequency PCB is fast

The transmission speed is inversely proportional to the square root of the dielectric constant, which means that the smaller the dielectric constant, the faster the transmission speed. This is the advantage of the high-frequency circuit board. It uses special materials, which not only guarantees the low dielectric constant, but also maintains the stable operation, which is very important for signal transmission.

3. high-frequency PCB can be adjusted

It is widely used in high-frequency PCBs that require precision metal material heating treatment in various industries. In the process of its field, not only can heating of different depth components, but also focus on heating according to local characteristics, whether it is surface or deep, Both centralized and decentralized heating methods can be easily completed.

4., high frequency PCB with strong tolerance

The dielectric constant and medium have certain requirements on the environment, especially in the south, where wet weather will seriously affect the use of circuit boards. High-frequency PCBs made of materials with extremely low water absorption can challenge such an environment. At the same time, they also have the advantages of resistance to chemical corrosion, moisture resistance, high temperature resistance, and great peel strength, allowing high-frequency and High-Frequency PCB to exert powerful performance .