High Frequency PCB

High Frequency PCB What is High Frequency (HF) PCB? Electronic devices with high frequency is the developing tendency nowadays, especially in wireless network. Satellite communication growing rapidly, information products move towards high speed and high frequency. Thus developing new products always need to use high frequency substrate, satellite system, mobile telephone receiving base station and so on, these communication products must use high frequency PCB. The features of Thick Copper PCB. DK should be small and stable enough, usually the smaller the better, high DK may lead to signal transmission delay. DF should be small, which mainly affect quality of signal transmission, the smaller DF could make smaller signal wastage accordingly. 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. Water absorptivity must be low, high water absorptivity will affect DK and DF when in the wet environment. Heat resisting property, chemistry resisting, impact endurance, peel off resisting must be good. Materials used for HF circuit board. High-frequency board for wireless applications and data rates in the upper GHz range have special demands on the material used: Adapted permittivity. Low attenuation for efficient signal transmission. Homogeneous construction with low tolerances in insulation thickness and dielectric constant. Generally speaking, high frequency can be defined as frequency above 1GHz. Currently, PTFE material is widely used in high frequency PCB China manufacturing, it's also called Teflon, which frequency is normally above 5GHz. In addition, FR4 or PPO substrate can be used to the product frequency among 1GHz~10GHz. These three high frequency substrate have below differences: With regard to laminate cost of FR4, PPO and Teflon, FR4 is the cheapest one, while Teflon is the most expensive one. In terms of DK, DF, water absorpti....

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