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Microwave Tech

Microwave Tech

Microwave Tech

Microwave Tech

How to design high frequency PCB board
2021-09-13
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Author:Kyra


In the high frequency PCB board design, the power supply is designed as one layer. In most cases, it is much better than the bus design, so the circuit can always follow the path with the smallest impedance. In addition, the power board must provide a signal loop for all signals generated and received by the PCB, which can minimize the signal loop, thereby reducing noise. Low-frequency circuit designers often ignore these noises.
In high-frequency PCB design, we should follow the following principles:
The unity and stability of power and the ground.
Careful consideration of wiring and proper termination can eliminate reflections.
Careful consideration of wiring and proper termination can reduce capacitance and perceived crosstalk.
Noise suppression is required to meet EMC requirements.

high frequency PCB board

High-frequency circuit board manufacturing material requirements:
1. The dielectric loss (Df) must be small, which mainly affects the quality of signal transmission. The smaller the dielectric loss, the smaller the signal loss.
2. If the water absorption rate is low, the high water absorption rate will affect the dielectric constant and dielectric loss.
3. The dielectric constant (DK) must be small and stable. Generally, the smaller the signal, the better the signal transmission rate, which is inversely proportional to the square root of the material's dielectric constant. High dielectric constant can easily cause signal transmission delay.
The thermal expansion coefficient of copper foil is consistent with the thermal expansion coefficient of copper foil, because the inconsistency in the process of cold and heat changes will cause the copper foil to separate.
Generally, a high-frequency board can be defined as a frequency above 1 GHz. Currently, the high frequency is a medium matrix of fluorine, such as polytetrafluoroethylene (PTFE) commonly known as Tefluron.
Matters needing attention in high frequency circuit board processing:
1. The impedance control requirements are strict, the relative line width control is very strict, and the general tolerance is about 2%.
2. Due to the special plate, the adhesion of PTH is not high, so it is usually necessary to roughen the holes and the surface with plasma treatment equipment to increase the adhesion of PTH. Hole copper and welding resistance ink.
3. Do not grind the plate before welding, otherwise the adhesion will be poor, only micro-corrosion solution and other roughening can be used.
4. The plates are mostly made of PTFE, and ordinary milling cutters will have a lot of edges when they are formed. Spe cial milling cutters.
High frequency circuit board is a special circuit board with high electromagnetic frequency. Generally, high frequency can be defined as a frequency higher than 1 GHz. Its physical properties, precision and technical parameters are very high. It is often used in automobile collision avoidance systems, satellite systems, radio systems and other fields.