4G communication technology has become popular, and the fifth-generation communication technology 5G is also accelerating the pace of commercial use. In this article, we will briefly talk about the 5G antenna technology. In order to bring faster speed, what changes have been made to the antenna of the base station? What are the characteristics of the antenna of the 5G mobile phone?
5G features5G has the advantages of high speed, massive device connection, low power consumption, low latency and high reliability. However, the imagination is very beautiful, the reality is very skinny, and the 5G implementation process is very difficult. The specific performance is:
5G is more complicated than 4G, and the performance requirements are higher.
5G needs to add a large number of base stations to achieve ultra-dense deployment;
5G also requires a large amount of spectrum resources to achieve ultra-high rates;
5G micro base station has greatly increased demand for antennasShannon ancestor Xiannong proposed the golden rule of the communication industry: C=B log2(1+S/N).
Simply put: the theoretical transmission rate C is directly related to the bandwidth B. This is well understood, and the road width directly determines the upper limit of the traffic flow.
In the same way, to improve traffic flow, instead of formulating more complicated road rules (corresponding to various protocols in communication, codec rules), it is better to increase the number of lanes to increase traffic volume. This is the simplest and most rude - princess hug The way.
The spectrum resources of mobile communication are too limited, and it is necessary to increase the bandwidth (B) only to adopt a higher frequency band. The 5G millimeter wave scheme is like a multi-lane ultra-wide highway, which has greatly increased the speed limit of each car. But the problem is that the propagation characteristics of electromagnetic waves are very interesting. The higher the frequency, the more straight the propagation path and the inability to bend. In this case, you have to face the antenna in a phone call. It is also too anti-human. Smart communication people think of micro base station technology. Imagine a shadowless lamp on the operating table to achieve full coverage by adding a light source.
The problem of straight line propagation is solved by increasing the coverage area by turning the macro base station into a plurality of micro base stations. At the same time, the macro base station is no longer responsible for the access network equipment, but each micro base station does this part of the work. With more grassroots staff, the upper level leaders can manage more people. The troublesome thing is that the high-band signal propagation loss is large, and large-scale multi-antenna technology (Massive MIMO) is needed to achieve spatial diversity and suppress propagation loss. Here, MIMO means multi-input and multi-output. There are more channels in parallel communication between the base station and the mobile phone. Each pair of antennas transmits one channel of information independently, and the rate is increased after being aggregated. It is also excellent.
Just like a date in love, I feel that all other voices except my sweetheart are noise. The communicator also thought of using a large-scale antenna array to control the phase and signal amplitude of the transmitting (or receiving) signal of each antenna unit, generating a directional beam (like a flashlight), eliminating interference from all directions, and enhancing the beam direction signal. .
This full exploitation of space resources can effectively utilize valuable frequency band resources and increase network capacity dozens of times. At the same time, the device can be positioned more accurately.
The length of the antenna is about 1/2 wavelength or 1/4 wavelength. In the 5G millimeter wave era, the antenna is getting smaller and smaller, and the number is increased in pairs. Now 4G phones are mostly 2&TImes; 2, 5G are at least 4 & TImes; 4, and the base station antenna is also up to 128 or 256 antennas. Everything is connected, and antennas are also needed.
As described above, according to the characteristics of 5G, the required antenna will have a certain change, then for the terminal, what characteristics does the antenna have compared to 4G?
Industrial power supplies are power products specially designed and produced for a certain industrial production industry. For industrial power supplies, absolute balance of electronics characteristics is not the main focus. Different industrial applications focus on different specific electronics index, some focus on the stability of the power supply output voltage or current, but the ripple is not the key judging criteria; some industrial applications have customized requirements for power supplies, such as adding time control, adding pulse functions, adding multiple outputs, etc. At the same time, it is necessary to consider the cost requirements of large-scale purchases of industrial applications, so for industrial power supplies, Application adaptability, Long-term operating Reliability and Reasonable cost control are the main points of attention for industrial power supplies.
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To overcomes the harsh application environment and long-term operating conditions. The industrial power supplies basically adopt water cooling, and the internal components of the power supplies are treated with three preventions, which can realize the effective heat dissipation and effective protection of internal devices of the power supply.
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