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On December 4, the Ministry of Industry and Information Technology officially issued TD-LTE 4G licences to China Mobile, China Telecom and China Unicom, and China officially entered the era of 4G. According to a report by GSMA Intelligence, a third-party analyst, more than 128 countries will deploy about 500 LTE networks by the end of 2017. 4G not only provides more bandwidth and brings better mobile Internet experience to people, but also challenges the carrier's mobile bearer network.With the issuance of 4G licenses in China, the LTE network will be deployed quickly. However, LTE base station coverage is small, deployment density is much higher than GSM base station and 3G base station, LTE construction will face a large number of new site demand, and part of the new site shortage of...
发布时间: 2018 - 10 - 18
1. IntroductionWith the continuous development of mobile communication, mobile communication antenna has experienced the development process from single polarization antenna, dual polarization antenna to smart antenna, MIMO antenna and even large-scale array antenna. After the great development of 4G, China Mobile now has about 1.5 million base stations, and the quality of antenna feeds is uneven. As the perception organ of mobile communication network, antenna is more and more complex and important in the network. Although antenna investment accounts for a small proportion (only about 3% of b...
发布时间: 2018 - 10 - 17
Conformal array antenna is an antenna array that keeps consistent with the shape of the object. It conforms the antenna array to the shape of the carrier, which enhances the adaptability and has great advantages over planar array antenna. In modern wireless communication systems, conformal array antennas, which can conformal to the surface of high-speed carrier platforms such as aircraft, missiles and satellites, and do not destroy the configuration and aerodynamics of the carrier, have become a research hotspot in the field of antenna and an important aspect of the development of phased array...
发布时间: 2018 - 10 - 17
If you look at it a little bit, you can see that the antenna towers are all high around you, or you can just put a signal tower on a local high-rise.I never knew why I had to do this before, but I took it for granted.However, after learning the principle of communication recently, the reason why the antenna tower is relatively high can be understood.Under the understanding of sight distance propagationLine-of-sight propagation (LOS propagation) refers to the propagation of space wave between two points that can be directly reached when ultra-short wave and microwave are used for ground communi...
发布时间: 2018 - 10 - 17
Known as the Middle East Silicon Valley, Israel is highly advanced in science and technology. Its chip industry and semiconductor technology are particularly noteworthy. Annual exports account for more than 20% of Israel's total exports. At the moment, Israel is developing smaller, 100 times faster superchips than traditional chips, promising.It is reported that Ulier Levy, a physicist at Hebrew University in Israel, and his research team have been working on a new chip technology. After more than three years of unremitting efforts, the research work has finally come to fruition. Using the...
发布时间: 2018 - 10 - 17
A few days ago, China Electric Science released a series of domestic terahertz imaging chips at the first Digital China Construction Summit.A terahertz chip with a grain size can play a huge role in the human body safety detector. It can detect the weak terahertz wave radiated by the human body itself, and analyze the detected signal through the internal algorithm of the instrument. It can image the human body and help the security personnel to quickly check the dangerous goods carried by the human body without causing any radiation harm to the detected personnel.The Terahertz chip, which is i...
发布时间: 2018 - 10 - 17
Smartphones are one of the most widely used and versatile electronic devices in the world today. They have gained tremendous popularity in the past decade and have become the main communication medium in the digital world. In some cases, especially in developing countries, smartphones may be the only computing device a user has. Just 10 years ago, there were less than 4 million smartphones listed. In contrast, IHS Markit estimates that global smartphone shipments will exceed 1.5 billion a year from 2017. Today, users are more concerned about the functions of the market, such as screen, camera,...
发布时间: 2018 - 10 - 17
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