1. What is “Smith Chart”?The chart was invented by Phillip Smith in 1939 while working at RCA in the United States. Smith once said, “When I can use a slide rule, I’m interested in graphically representing mathematical relationships.”The basics of the Smith chart lie in the following formula.where Γ represents the reflection coefficient of its lineThat is, S11 and ZL in the S-parameter are the nor……

The X-band belongs to the microwave frequency range. There are two versions of X-band: one refers to the radio wave band with a frequency of 8-12 GHz, and the other refers to the frequency range of X-band with a frequency of 7-11.2 GHz.According to IEEE 521-2002 standard, X-band refers to the radio wave band with a frequency of 8-12 GHz (wavelength range 37.50 – 25.00 mm), which belongs to microwa……

GalaxySpace successfully realized the first domestic V-band low-orbit satellite measurement and control on its 02 batches of satellites. This batch of satellites was successfully launched at the Xichang Satellite Launch Center on March 5. It is the first low-orbit broadband communication satellite developed in batches in my country.In-orbit simulation map of Galaxy Aerospace 02 batches of satellit……

Massive MIMO (massive multiple-input multiple-output) is a key technology for 5G to improve system capacity and spectrum utilization.In the 5G era, Massive MIMO technology is widely used in base stations.The number of Massive MIMO antennas used in 5G can reach 64 or 128.In the future, when themillimeter wave technologyturns to be more reliable and cost effective, the antenna size is expected to be……

1.Combiner:In the wireless mobile phone communication system, the main function of the combiner is to combine the input multi-band signals and output them to the same indoor distribution system.The combiner is generally used at the transmitting end. Its function is to combine two or more radio frequency signals from different transmitters into one and send it to the radio frequency device transmit……

Long-Term Evolution (LTE) is a wireless broadcast communication standard for mobile devices and data ports based on GSM/EDGE and UMTS/HSPA technologies. The standard was developed by 3GPP (3rd Generation Partnership Project) and intended as a GSM/aims to provide a path for the upgrade of GSM/UMTS networks and CDMA2000 networks. The following are the 3GPP-based advanced requirements for LTE: F……