Research And Markets.com, an international market research institute, recently released a report on the global market of 2020-2023 coaxial cables, saying that the market will grow at a compound annual growth rate (CAGR) of 3.47% in 2020-2023, and is expected to reach 34.17 billion US dollars by 2023. In the specification of USB4 and Thunderbolt, which is currently one of the largest consumer 3C market interfaces, in addition to the traditional differential STP structure, a large number of coaxial structures have been used. Moreover, the wire transmission signal of this coaxial structure is not the traditional signal transmission by the internal and external conductors of one coaxial line, but the differential signal transmission by two coaxial lines. RF Mini-coaxial was mainly used for Notebook, mobile phone, GPS, Measuring instruments, Bluetooth technology, etc., while the existing market has begun to add many medical coaxial lines, Teflon coaxial electronic wires, wireless RF coaxial wires and many other board-end interfaces to use coaxial transmission.

At present, the mainstream cable application scheme of ultra-fine coaxial cable

Advantages of coaxial line physical properties:

The wire diameter can be made smaller, compared with the twisted pair structure.

The flexibility of wire is better than that of twisted pair structure.

The bending performance of wire rod is better than that of twisted pair structure.

Advantages of coaxial high frequency performance

As can be seen from the anatomical structure of the coaxial line, from the inside to the outside, they are: central conductor, insulating layer, outer conductive layer (metal mesh), and wire sheath. The coaxial cable is a composite composed of two conductors. The central conductor of the coaxial cable is used to transmit the signal. The metal shielding network plays two roles: one is as the common ground wire of the signal to provide the current circuit for the signal, and the other is as the shielding network of the signal to suppress the interference of electromagnetic noise on the signal. The central conductor and the shielding mesh are between the semi-foamed polypropylene insulation layer, which determines the transmission characteristics of the cable and effectively protects the middle conductor. Now USB4 and Thunderbolt 4 or HDMI2.1 use two coaxial lines for differential signal transmission

As the name implies, the above can be summarized as the coaxial line is composed of a layer of insulating layer wrapped with the central copper conductor, and a metal mesh layer wrapped outside the insulating layer. Since the outer metal mesh and the central axis are on the same axis, it is called the coaxial line.

The metal mesh can shield the electromagnetic interference of the outer layer,

Part of the interference of the data line comes from the external magnetic field, and the other part comes from the magnetic field generated by itself when transmitting changing signals.

Due to the existence of metal shielding mesh, the external magnetic field of coaxial cable cannot pass through the shielding layer, and the internal magnetic field cannot pass through the shielding layer. When the signal is transmitted in the coaxial cable, its attenuation is related to the transmission distance and the frequency of the signal itself.

For high-frequency signals, the farther the transmission distance is, the greater the signal attenuation is. In order to achieve the purpose of long-distance transmission of high-frequency signals, coaxial amplifiers are usually used to amplify and compensate the signals.

Disadvantages of coaxial structure:

1: Traditional equipment cannot meet the requirements.

2: The processing technology is complex and the cost is high.

Laser paint removal

Four-head laser cutting coaxial system (90 ° ring cutting) laser cutting core wire In the past few decades, the use of coaxial cable in the global cable broadband has contributed to the growth of the market. Broadband cable has many advantages due to its affordability and innovation (for example, high speed, enhanced reliability and high download peak time). With the increasingly stringent requirements of the market for high-frequency transmission, high-speed transmission requires extremely strong anti-interference ability and electrical performance stability of the wire. In order to ensure the stability of high-frequency transmission, its current mainstream is still coaxial version, Coaxial production and manufacturing process is a complex process. To solve high-frequency and high-speed applications, appropriate production equipment and mature and stable production process are required. In the production of high-speed products, material selection, process parameters and process control, and special laboratory testing of electrical parameters all play a key role. Throughout the return of the overall coaxial structure, various equipment manufacturers have begun to solve and improve their pain points, which will promote more application scenarios of coaxial structure. The future coaxial structure may have a great development. I don't know what you think of it. Welcome to leave a message for discussion.