The base station antenna is the intermediate component of transmitting and receiving signals, and can be used as a converter to convert the online traveling wave and space radiation electromagnetic wave into each other. With the arrival of the 5G era, traditional antennas have begun to be replaced by high-end and high-tech base station antennas, and more and more new technologies will be applied to base station antennas. In the future, 5G base stations will continue to increase, and the single value of 5G base station antennas will increase synchronously, which will boost the investment scale of 5G base station antennas and promote the development of the entire base station antennas.
The development of base station antenna in China has experienced the process from the initial dependence on foreign imports to the current local independent production. After the simple structure and low performance of base station antennas are gradually introduced into a variety of technologies, they have changed from omnidirectional, single-polarization to multi-band, multi-polarization, and directional. In today's 5G era, the international status of domestic base station antenna manufacturers has been further improved, Huawei has independently researched and developed, and the industrial chain layout has become a giant in the global antenna market.
At present, the core of antenna technology is large-scale array antenna technology. The upgrading and active development of base station antennas increase the cost of antenna design and production, and actively promote the value-added of base station antennas, thus affecting the market scale. From 2016 to 2020, the compound annual growth rate of the base station antenna market is 36.72%, based on this growth rate, the base station antenna market will reach 41.6 billion yuan in 2021.
Laser soldering applications for base station antenna cables and PCBS
In the field of mobile communication, the structure of the base station antenna is more complex, and its internal structure is mainly composed of sheet metal parts, die casting parts, PCB circuit boards, coaxial cables and other parts assembly or structural parts welding. Among them, the welding between metal structural parts is a more common process, the purpose of welding is to ensure a good electrical connection, the second is to ensure a lasting mechanical connection. Therefore, there are very high requirements on the consistency of tin content, the melting permeability of solder joints, mechanical strength and other related parameters.
In the prior art, after the surface treatment of the metal structural parts, a single welding head is usually used for point-to-point heating, and the solder is added at the same time, so that the welding surface of the two metal structural parts forms an alloy layer to achieve effective connection. Due to the heating of a single welding head, the solder near the welding head is more heated, and the solder far from the welding head is less heated, resulting in different heat of the solder, and its flow is uneven, making the consistency of the strength of the welding surface is poor, reducing the stability of the connection.
Guosheng Laser provides a laser soldering method for base station antenna to solve the problem of unstable welding of metal structural parts and hardware structural parts. These include:
1. The structural parts are fixed so that the surface to be welded on the structural parts contact or spacing preset distance.
2. The use of automatic welding device fixed multiple welding points of the structural parts, rapid implementation of laser heating to achieve preheating treatment.
3. The laser welding system on the automatic welding device is used to heat the structural parts at the same time, and the solder is automatically transported until the preset heating time is reached.
4. Finally, the laser welding system on the automatic welding device automatically removes the solder, and forms a solid alloy surface solder joint after cooling.
The laser welding system automatically sends tin and the amount of tin is accurate and controllable. At the same time, the system has the function of constant temperature and temperature control, and the laser preheating time and welding heating time can be programmed by software to ensure the consistency of each contact surface solder joint. In addition, laser soldering also has the advantages of precise welding position control, welding process automation, etc., and has been widely used in the processing and production of coaxial cable and PCB circuit board welding.