TDD is a duplex method of communication systems that is used in mobile communication systems to separate receiving and transmitting channels.China submitted the draft third-generation mobile communication standard (TD-SCDMA) in June 1997, and its TDD model and new technology of smart antennas were highly evaluated and became one of the three main candidate standards. Considering that TD-SCDMA has ……

In the last article, we introduced the SMA connector. Usually, when selecting RF connectors, the main factors are its frequency range, impedance, withstand voltage, VSWR, size, etc. Therefore, different connectors have different properties and are suitable for different scenarios.There are several common types of RF coaxial connectors: N, SMA, L29, BNC, 2.92mm, 2.4mm, 3.5mm, 1.85mm, 1.0mm etc.N Ty……

There are 12 available frequency bands for TD-LTE in the world, which are 1900 ~ 1920MHz, 2010～2025 MHz, 1850～1910MHz, 1930～1990MHz, 1910～1930MHz, 2570～2620MHz, 1880～1920MHz, 2300～2400MHz, 2496～2690MHz, 3400～3600MHz, 3600～3800MHz, 703～803MHz.China has divided into 4 frequency bands for TDD, which are: 2010～2025MHz, 1880～1920MHz, 2300～2400MHz, 2496～2690MHz.Among them, Spectrum in the 2496-2690 MHz ……

At the 3GPP RAN#96 meeting held in Budapest, Hungary from June 6 to June 9, 3GPP officially defined the U6G (6GHz upper band, ie 6425-7125 MHz) as authorized spectrum, the frequency band number is n104, which clarified the corresponding network/terminal RF standards, and provided a standard basis for the subsequent industry chain research and development of 6GHz products.At the same time, the conf……

Base Station，generally refers to the “public mobile communication base station”, (abbr.: BS), the base station is used to provide signals to mobile phones. It usually consists of the following four parts:  Antenna-Feeder System：Responsible for signal transmission and reception, including antennas and feeders.Remote Radio Unit：Responsible for signal generation and extraction, which is the……

MIIT (The Ministry of Industry and Information Technology) introduced on the 19th, July that a total of 1.854 million 5G base stations have been built and opened in China, of which nearly 300,000 new base stations were added in the second quarter. It means China has realized “5G access to every county and broadband to every village”. 5G mobile phone users reached 455 million.The analyst Data shows……