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Brief talk Printed Circuit Board
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         A very important link in the 5G industry chain is the PCB, which is also the Printed Circuit Board (Printed Circuit Board)

       PCB (printed circuit board) is a printed circuit board, abbreviated as printed circuit board, which is one of the important basic component problems in the electronic technology industry. Almost every kind of electronic information equipment, from electronic watches, calculators, to computers, communication development electronic control equipment, military weapon systems, as long as there are electronic components such as integrated management circuits, in order to make the electrical interconnection between the various components , All through the use of printed boards. The printed circuit board is composed of an insulating bottom plate, connecting wires and pads for assembling and welding electronic components, and has a dual effect of a certain conductive circuit and an insulating bottom plate. It can directly replace some complex wiring and realize the electrical connection between the components in the entire circuit. It not only simplifies the assembly and welding of Chinese e-commerce products, reduces the wiring workload under my country’s traditional teaching methods, and greatly reduces the workload of workers Intensity of labor relations; and reduced the size of the whole machine, reduced the company's product sales costs, and improved the quality and reliability of rural electronic machinery and equipment. The printed circuit board has a good product consistency, it can choose to adopt the International Organization for Standardization design, which is conducive to the realization of agricultural mechanization and automation in the production and operation process. At the same time, the whole printed circuit board that has been assembled and debugged can be used as an independent spare part of a country in society, which is convenient for the exchange and maintenance of the whole product. At present, printed circuit boards have become extremely widely used in the production and processing of various electronic financial products.

          Generally speaking, the substrate of PCB is made through glass and fiber. In most enterprises, the glass of PCB as a fiber base material generally refers to "FR4" as a teaching material. "FR4" this kind of impact solid material material can give PCB hardness and thickness. In addition to the traditional substrate such as FR4, there is also a flexible circuit board design produced on flexible high-temperature processing plastic (polyimide or similar) and so on. You may not find many PCBs with different cultural thicknesses; however, the thickness of SparkFun's products is 1.6mm (0.063’’) for most students. Some related products also use other structural thicknesses in China. For example, LilyPad and Arudino Pro Micro boards use a thickness of 0.8mm.

         PCB has developed from single-layer to double-sided, multi-layer flexible, and still maintains its own development trend. Due to the continuous development in the direction of high precision, high density, and high reliability, the volume is reduced, the cost is reduced, and the performance is improved, so that the printed board will still maintain a strong vitality in future electronic equipment development projects. The development trend of PCB manufacturing technology at home and abroad is basically the same, that is, the development towards high density, high precision, fine aperture, fine line, fine pitch, high reliability, multi-layer, high-speed transmission, light weight and thin profile. At the same time, it is necessary to increase productivity, reduce costs, reduce pollution, and adapt to the production direction of multiple varieties and small batches. The technical development level of the printed circuit is generally expressed by the line width, aperture, and plate thickness/aperture ratio on the printed circuit board.