High frequency PCBs are widely use in all kinds of places. Especially in communication systerm and wireless net work projects. So high frequency PCB is necessary to transfer the high speed signal. Mobile telephone and satellite systerm all use these high frequency PCB.
For special circuit boards with high electromagnetic frequency, generally speaking, high frequency can be defined as the frequency above 1GHz. Its physical performance, accuracy and technical parameters are very high, which are commonly used in the fields of automobile anti-collision system, satellite system, radio system, etc. The price is high, usually around 1.8 per square centimeter, about 260$ per square meter. High frequency electronic equipment is the development trend, especially in the development of wireless network and satellite communication, information products tend to high speed and high frequency, and communication products tend to the standardization of voice, video and data of wireless transmission with large capacity and high speed, so the new generation of products need high frequency base plate.
The High frquency (HF) PCB have several features:
1.DK should be small and stable enough, usually the smaller the better, high DK may lead to signal transmission delay.
2. DF should be small, which mainly affect quality of signal transmission, the smaller DF could make smaller signal wastage accordingly.
3. The thermal expansivity should be the same with copper foil as much as possible, because the difference will lead to copper foil separated in the changes of cold and heat.
4. Water absorptivity must be low, high water absorptivity will affect DK and DF when in the wet environment.
5. Heat resisting property, chemistry resisting, impact endurance, peel off resisting must be good.
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