Wired
In the hot summer, some students passed the most important college entrance examination in their lives. In such a hot summer, for some mobile phones listed in the spring and winter, this first “big test” is here.
I believe that there are already some small partners who have already felt the feeling that the mobile phone is starting to get hot, especially under the influence of the 5G network, the increase in network speed has made the amount of data per unit time greater, and the processing and calculation of the mobile phone has increased. With a certain burden, the heat dissipation problem becomes more prominent.
Moreover, nowadays mobile phones usually use relatively larger batteries and larger camera modules, which squeeze part of the motherboard space, make the motherboard more integrated, smaller in area, and less conducive to heat dissipation. Many brands of products have added a large number of VC liquid cooling and other materials to enhance the heat dissipation effect.
In such a large-scale case, heat dissipation is still a test. For mobile phones, nowadays, the appearance is mainly made of glass, and the thermal conductivity is still much worse than that of metal materials. Many mobile phones just “stuff” the heat in the body. With a larger amount of data and an increase in outside temperature, heat dissipation has indeed become a problem.
Since the thermal conductivity of metal is much stronger than that of glass, a few years ago, mobile phones were also popular for a long time with metal materials. Why do not today’s mobile phones use metal shells, and why is the mainstream material still glass? In fact, there are three main considerations.
1. Antenna design requirements in the 5G era are higher
The first thing to bear is the signal problem. If you want a good signal, you need to design the antenna of your mobile phone. With the advent of the 5G era, 5G speeds are faster. In order to achieve a large amount of data throughput, the antenna design also adopts the MIMO design, that is, the multiple-in-multiple-out design. 5G even achieves 4*4 MIMO. Coupled with the addition of 5G, and the different frequency bands of 5G, millimeter waves may also be involved. These make the addition of 5G antennas no longer as simple as adding one. It may only add 5 to 6 antennas for 5G. In addition, the previous 2G, 3G, and 4G frequency bands require 1-2 antennas. This aspect alone requires so many antennas.
Of course, with the coming of the 5G era, there are more other functional enhancements. In terms of Wi-Fi, in addition to supporting 2.4GHz and 5GHz, today’s Wi-Fi even has 2*2 MIMO 160MHz, which also requires More antennas to achieve. There are also dual-frequency GPS antennas, and even UWB, which is ultra-wideband technology, requires antennas.
These “miscellaneous” frequency bands and technologies, plus the need to consider the signal blocking problem caused by the holding of the game mobile phone, have caused the number of antennas required by today’s mobile phones to be extremely exaggerated, and the design requirements for antennas are becoming higher and higher. The metal back shells used in the past were all made of injection molding of the antenna on the metal shell, or made into a three-stage structure. Today, the number of antennas cannot be met at all. In the past, metal housings were used to make antenna receivers, but they still cannot meet today’s number requirements. At present, there are still some mobile phones that have the antenna part on the mobile phone holder, or even on the back of the back shell. If a metal frame is used, the metal will reflect the signal, causing signal reception problems.
Second, the popularity of NFC makes metal back shells an obstacle
Secondly, the signal is only one aspect, the popularity of NFC has also become one of the reasons for the replacement of the material of the back shell of the mobile phone. This is mainly because before the 5G era, the back shells of mobile phones have also tended to use glass back covers. But here, many people may ask. In the past, some mobile phones with NFC function also used metal back shells. Is there any relationship between NFC and metal back shells?
In fact, in the past, mobile phones that used metal back shells with NFC, some had the NFC antenna implanted in the injection-molded antenna of the metal back shell, and some had operations such as slot implantation of the antenna in the camera hole area. Of course, this also has certain requirements for the manufacturing process of the back cover of the mobile phone. With the continuous decline of NFC-equipped products and the continuous increase of functions, the situation that the metal back cover antenna is reserved for NFC has become a problem, and it is relatively low. The price of the product is limited by the cost, and the use of a glass back shell is obviously a better choice.
Third, the addition of wireless charging makes the metal back shell more embarrassing
Finally, there is another aspect that allows flagship phones that will adopt higher-end technology to gradually abandon the metal back shell, and that is the addition and development of wireless charging. Nowadays, wireless charging has become the choice of some flagship products. After all, wireless charging can bring a more free charging experience and higher convenience to people.
Of course, wireless charging and the metal back shell are also a pair of “dead rivals”. This is mainly because wireless charging uses coils and relies on the principle of electromagnetic induction. This principle is applied to induction cookers. Of course, induction cookers use electromagnetic induction to generate eddy currents. Heat it up. Some wireless chargers also have a foreign body detection function, that is, they are afraid that ferromagnetic metals will produce eddy current effects and cause metals to heat up and cause problems. Not to mention that the power of wireless charging of mobile phones is getting higher and higher. This aspect still needs to be cautious. In fact, most of the metal casing of mobile phones is made of aluminum alloy. Although aluminum alloy is difficult to generate eddy current heating, it will block the propagation of electromagnetic waves, so wireless charging is useless…
In summary, whether from the perspective of antenna design or the addition of more functions today, the metal back shell has become a kind of “obstacle.” Therefore, if you want to solve these problems, whether it is from the perspective of making more improvements to the metal back shell or making a lot of improvements to the antenna, it is more economical and more feasible than directly choosing glass with less impact. High, so the metal back shell that we once loved is also far away from us. However, in terms of heat dissipation, the only way to optimize system software is to allocate more intelligent system resources, reduce power consumption, and solve these problems as much as possible by means of a soaking plate.
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