A piece of paper is pasted on the screen of signal enhancement, and the signal changes from 1 grid to 3 grid per second?

For a period of time, the “signal enhancement sticker” which claims to be able to “enhance the whole scene” of mobile phone signal has been selling well on the Internet, and this small piece of metal is not small behind its back. < / P > < p > open some e-commerce platforms, and the “signal enhancement paste” products are quite rich. The cheapest one is only 3 yuan, and the expensive one is only about 70 yuan. Many sales are still very popular. Some businesses sell more than 1000 orders a month, and some even put together more than 100000 orders. < / P > < p > businesses claim that enhanced stickers can intelligently amplify mobile phone signals, and can be used in basements, villas, mountainous areas, rural areas and other places. < / P > < p > as for the working principle, when asked about the customer service, he got a reply: “as long as the back cover of the mobile phone is not glass, it can be enhanced. After pasting, the signal of 1 grid can be enhanced to 3 bars generally.” “The principle is that stickers can increase the wavelength of the phone.” “The receiving range of the signal is enhanced by lengthening the wavelength of the received signal from the built-in antenna of the mobile phone.” < / P > < p > some businesses said that the signal enhancement stickers also had magical functions such as improving the performance of mobile phones, reducing radiation levels, and extending battery life, and provided “proof” of relevant product instructions. < / P > < p > however, there are many brands of signal enhancement stickers, but they are basically informal brands. After consulting the brand manufacturers, we can see that there are no so-called signal enhancement stickers in the production and marketing range, and we can’t find the certificate after purchasing the products. < / P > < p > after a large number of consumers purchase, they find that the effect is not as magical as the publicity. Some consumers said: “there is no effect at all, or the signal is very poor. Think about it carefully. How can I read mobile phone information without a chip? How can we modify the system settings and optimize the network According to Li Jinxin, a professor at the school of electronic information, Hangzhou University of Electronic Science and technology, from the perspective of material and structure, the so-called signal enhancement paste is that a plastic sheet is coated with a layer of aluminum film, and the aluminum film is also printed with a layer of material similar to magnetic ink, so the principle is not clear at all. < / P > < p > for example, electromagnetic wavelengths can’t be “stretched” in real life. To amplify anything, energy is needed, but stickers don’t have them, and a sticker can’t resonate with all mobile phones. < / P > < p > think about it carefully. In order to enhance the signal, both operators and mobile phone manufacturers are struggling with their brains. From the base station layout to the mobile phone design, they have exhausted all kinds of methods. If a sticker can greatly enhance the signal, such black technology will not be directly built into the mobile phone? Continue ReadingDeveloped a “plug and play” solar power generation scheme, and “5B” won a $12 million round a financing