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Copper clad laminate industry is in the middle reaches of the whole PCB industry chain, providing raw materials for PCB products. Copper clad laminate (CCL) is a kind of board-like material, which is made by drying, cutting and laminating the electronic glass fiber cloth or other reinforced materials with resin adhesive, covering one or both sides with copper foil and hot pressing. It is mainly used to make printed circuit board (PCB), which plays the role of interconnection, insulation and support for PCB. In the upstream of the industrial chain, raw materials such as electrolytic copper foil, wood pulp paper, glass fiber cloth and resin are in the upstream, PCB products are in the downstream, and the terminal industries are aerospace, automobile, household appliances, communication, computer, etc.
5g was initially commercialized in 19 years. The upstream raw materials of core materials such as high-frequency copper clad laminates are basically similar to those of traditional CCL. After being produced by downstream PCB manufacturers as high-frequency circuit boards suitable for high-frequency environment, they are applied to base station antenna modules, power amplifier modules and other equipment components, and finally widely used in communication base stations (antennas, power amplifiers, low-noise amplifiers, filters, etc.) Automotive auxiliary system, aerospace technology, satellite communication, satellite TV, military radar and other high-frequency communication fields.
5g high frequency technology puts forward higher requirements for the circuit. The RF circuit with working frequency above 1GHz is generally called high-frequency circuit. In the process of mobile communication from 2G to 3G and 4G, the communication frequency band develops from 800MHz to 2.5GHz. In 5g era, the communication frequency band will be further improved. PCB board will be equipped with antenna oscillator, filter and other devices in 5g RF. According to the requirements of the Ministry of industry and information technology, it is expected that the early 5g deployment will adopt the 3.5GHz frequency band, and the 4G band will mainly be around 2GHz. The electromagnetic wave with the wavelength of 1-10 mm in the frequency band of 30-300ghz is usually regarded as millimeter wave.
When 5g large-scale commercial use, millimeter wave technology ensures better performance: extremely wide bandwidth, available spectrum bandwidth of 28ghz band can reach 1GHz, available signal bandwidth of each channel in 60GHz band can reach 2GHz; corresponding antenna has high resolution, good anti-interference performance, and can be miniaturized; propagation attenuation in the atmosphere is fast, which can realize close range secure communication.
In order to meet the requirements of high frequency and high speed, and to deal with the problems of poor penetration and fast attenuation of millimeter wave, 5g communication equipment has the following three requirements for PCB performance:
Low transmission loss;
Low transmission delay;
Precision control of high characteristic impedance. There are two ways to make PCB high frequency. One is to use high frequency CCL, which is called high frequency copper clad laminate.
