source:Other information release time:2022-11-16 Hits: Popular:PCB Assembly company
High frequency is the development trend of electronic equipment, especially with the increasing development of wireless networks and satellite communications, information products are moving towards high speed and high frequency, and communication products are moving towards the standardization of voice, video and data for wireless transmission with large capacity and fast speed Therefore, the new generation of products need high-frequency baseboard. Communication products such as satellite systems and mobile phone receiving base stations must use high-frequency circuit boards. In the next few years, it is bound to develop rapidly, and high-frequency baseboard will be in great demand.
The basic characteristics of the substrate materials for high-frequency circuit boards are as follows:
1. Other heat resistance, chemical resistance, impact strength, peel strength, etc. must also be good.
2. Low water absorption and high water absorption will affect the dielectric constant and dielectric loss when affected with moisture.
3. The thermal expansion coefficient shall be consistent with that of copper foil as much as possible, because the inconsistency will cause copper foil separation in cold and hot changes.
4. 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.
5. The dielectric constant (Dk) must be small and stable. In general, the smaller the better the signal transmission rate is, the inverse ratio of the square root of the dielectric constant of the material is. High dielectric constant is easy to cause signal transmission delay.
Generally speaking, the high frequency of high frequency circuit board can be defined as the frequency above 1GHz. At present, the high-frequency circuit board substrate that is more commonly used is the fluorine dielectric substrate, such as polytetrafluoroethylene (PTFE), which is usually called Teflon and is usually used above 5GHz. In addition, FR-4 fiberglass board or PPO substrate can be used for products between 1GHz and 10GHz,
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