He mobile phone signal amplifier (professional name: repeater or booster) consists of antennas, RF duplexers, amplifiers/repeater/booster device, mixers, electrical attenuators, filters, power amplifiers and other components or modules to form uplink and downlink amplification links. The basic principle of its work is: use the forward antenna (donor antenna) to receive the downlink signal of the base station into the repeater, amplify the useful signal through the low noise amplifier, suppress the noise signal in the signal, and improve the signal to noise ratio (S/N). After being down-converted to the intermediate frequency signal, filtered by the filter, amplified by the intermediate frequency, then frequency-shifted up to the RF, amplified by the power amplifier, transmitted by the backward antenna (retransmission antenna) to the mobile station; The uplink signal of the mobile station is received, and is processed by the uplink amplification link along the opposite path: that is, after the low noise amplifier, the down converter, the filter, the intermediate amplifier, the up converter, and the power amplifier are transmitted to the base station. Thereby achieving two-way communication between the base station and the mobile station.
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