1.0 What is high frequency PCB
High frequency PCB is a special PCB with high electromagnetic frequency. Generally, a high frequency PCB can be defined as a PCB with a frequency of 1GHz or above. The physical performance, precision and technical parameters of the high frequency PCB are very high, so that they are often used in automobile Anti-Collision system, satellite system, radio system and other fields.
2.0 Different about PCB
The high frequency PCB comprises a chip board with a hollow groove and a copper clad board bonded to the upper and lower surface of the chip board by flow adhesive. On the other hand, the upper and lower opening edges of the empty slots in high frequency PCB are provided with a blocking edge.
Designers often look at the wiring on a PCB to distinguish the type of circuit board. If the PCB is all or most of high frequency signal line, then the PCB is high frequency board.
3.0 Advantage of high frequency
3.1 High efficiency
A high frequency PCB with a small dielectric constant will also have a small loss. In the high frequency circuit board, the advanced induction heating technology can meet the heating requirements of the target, and the efficiency is very high. While PCB has a high efficiency, it also has excellent environmental protection with the development trend of the current society.
3.2 High transmission speed
The transmission speed is inversely proportional to the square root of the dielectric constant, which means that if there is a smaller dielectric constant, there is a faster transmission speed.When high frequency PCB uses special materials, it not only to ensure the characteristics of small dielectric constant, but also to maintain stable operation. It is very important for signal transmission.
3.3 High temperature control
high frequency PCB are widely used in various industries for precision metal material heat treatment requirements. In the field of the process, high frequency PCB not only can realize the depth of different parts of heat, but it also can focus on heat the key in the board according to different characteristic for each location. Both the surface and deep, centralized or decentralized heating mode, it can be easily accomplished.
3.4 Strong tolerance
Dielectric constant and medium will have certain requirements on the environment. Wet weather will seriously affect the use of circuit boards. But high frequency circuit boards which made of extremely low water-absorbing materials can challenge such an environment. It has the advantages of chemical corrosion resistance, moisture resistance, high temperature resistance and great peeling strength at the same time, so that high frequency circuit boards play a strong tolerance.
4.0 High frequency PCB characteristics
1. The impedance control requirements and relative line width control requirements of high frequency PCB are very strict. The margin of error between these two requirements is only allowed to be within 2%.
2. PTH has low adhesion with copper due to the special plate. Usually, it is necessary to use plasma processing equipment, which roughen the through-hole and surface to increase the adhesion of PTH hole copper and welding ink.
3. Ordinary milling cutters can form many burrs because most high frequency PCBS are made of PTFE. Therefore, designers need to use special milling cutters.
4. High frequency PCB is a special PCB with high electromagnetic frequency. In general, high frequencies can be defined as frequencies above 1 GHz.
5. PCB designers consider the RF PCB to be any high frequency PCB operating above 100MHz. Within the RF level, microwave PCBs are available above 2GHz.