What is C-band?The C-band is full band between 4 to 8GHz, which has been used for satellite since 1970s, now part of the band ranges is released for cellular companies. The International Telecommunication Union (ITU) has divided C-band into three groups: band n77(3300~4200MHz), band n78(3300~3800MHz), and band n79(4400~5000MHz).Most European and Asian countries currently use n78(3.3 to 3.8GHz……
A TX RX Multicoupler is a device used to couple the transmitter and receiver to an antenna. It transmit signals with high port-to-port isolation. A typical multicoupler consists of filters/duplexers, a Low Noise Amplifier and a power divider. It is an important part of a telecommunication system.When multiple receivers or transmitters or radio stations share an antenna, in order to avoid mutual in……
On November 10, China Telecom released own-developed 5G satellite dual-mode mobile phone, Tianyi Platinum S9, was officially released at the 2023 Digital Technology Ecology Exhibition. Satellite communications may show two technological evolution routes:At the terminal level, direct connection to satellites has gradually evolved from dedicated terminals to smartphones.At the satellite equipme……
The RF front-end is a vital part of wireless communication equipment, and it is the basic component for converting wireless electromagnetic wave signals and binary digital signals into each other.The Structure of the RF Front-EndRF front-ends can be divided into transmitter (TX) and receiver (RX) based on function.According to the components, it can be divided into power amplifiers (PA), low-frequ……
A coaxial attenuator is an energy-degrading RF/microwave component that contains resistive materials inside. In addition to the commonly used resistive fixed attenuators, there are also electronically controlled fast-adjustment attenuators.Attenuators are widely used in a variety of applications where power level adjustment is required. The basic materials that make up a coaxial attenuator ar……
Lumped-parameter design and Distributed-parameter design are common methods of radio frequency circuit design. This article will introduce the characteristics and differences between the two briefly. Feature summaryLumped circuit theory: circuit size is much smaller than the wavelength.Distributed Circuit Theory: circuit size is comparable to wavelength. Lumped parameter circuitLumped pa……
