The high-frequency printed circuit board (HF PCB) is a special circuit board with a high electromagnetic frequency. Generally speaking, the high-frequency PCB can be defined as a frequency above 1 GHz. Its physical properties, precision, and technical parameters are very high, and it is often used in automotive anti-collision systems, satellite systems, radio systems, and other fields.
The characteristics of high-frequency PCB.
1. High DK may cause signal transmission delays. So DK should be small and stable enough, usually as small as possible.
2. Smaller DF can reduce signal loss accordingly. So DF should be small, which mainly affects the quality of signal transmission.
3. The coefficient of thermal expansion should be as close as possible to the copper foil, as the difference will cause the copper foil to separate when the heat is changed.
快乐三张牌下载官方4. In a humid environment, the high water absorption rate will affect DK and DF. Therefore, the water absorption rate must below,
Material for HF PCB
Currently, PTFE materials are widely used in high-frequency PCB manufacturing, also known as Teflon. Its frequencies are usually higher than 5 GHz. In addition, FR4 or PPO substrates can be used for product frequencies between 1 GHz and 10 GHz.
快乐三张牌下载官方HF PCB for wireless applications and data rates in the high GHz range have special requirements for the materials:
快乐三张牌下载官方1. Adapt to the dielectric constant.
2. Inefficient attenuation, effective signal transmission.
快乐三张牌下载官方3. Uniform structure, low insulation thickness, and dielectric constant tolerance.
In addition to selecting the appropriate PCB material and determining the correct Er value, designers should also consider parameters such as PCB layout, conductor width and spacing, substrate constants, and so on. These parameters must be precisely specified and implemented using the highest level of process control.
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