Wireless communication systems generally include four parts: antenna, radio frequency front-end, radio frequency transceiver module, and baseband signal processor.
With the advent of the 5G era, the demand and value of antennas and radio frequency front-ends are rising rapidly. The radio frequency front-end is the basic component that converts digital signals into wireless radio frequency signals and is also the core component of the wireless communication system.
According to the function, the radio frequency front-end can be divided into the transmitting end Tx and the receiving end Rx.
According to different devices, the RF front-end can be divided into power amplifiers (RF signal amplification at the transmitter end), filters (signal filtering at the transmitter and receiver ends), low-noise amplifiers (signal amplification at the receiver end, noise reduction), switches (switching between different channels), Duplexer (signal selection, filter matching), tuner (antenna signal channel impedance matching), etc.
Filter: gate specific frequencies and filter interference signals
The filter is the most important discrete device in the RF front-end. It allows specific frequency components in the signal to pass through and greatly attenuates other frequency components, thereby improving the signal's anti-interference and signal-to-noise ratio.
Diplexer/Multiplexer: Isolation of transmit/receive signals
The duplexer, also known as an antenna duplexer, consists of two sets of band-stop filters with different frequencies.
The duplexer utilizes the frequency division function of a high-pass, low-pass or band-pass filter to allow the same antenna or transmission line to use two signal paths, thereby enabling the same antenna to receive and transmit signals of two different frequencies.
Low noise amplifier(LNA): amplifies the received signal and reduces the introduction of noise
The low-noise amplifier is an amplifier with a very small noise figure. Its function is to amplify the weak radio frequency signal received by the antenna and minimize the introduction of noise. The LNA can effectively improve the receiving sensitivity of the receiver, thereby increasing the transmission distance of the transceiver.
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Post time: Feb-29-2024
