Radio-frequency transceiver front-end circuit

A radio-frequency (RF) transceiver front-end circuit, comprising:

• an antenna;
• a first transceiving switch connected to the antenna, and including a first signal receiving path and a first signal transmitting path;
• a reception processing unit, comprising a low-noise amplifier connected to the first signal receiving path, a first variable gain amplifier provided at a back-end circuit of the low-noise amplifier, and a first phase shifter provided at a back-end circuit of the first variable gain amplifier, wherein a phase of the first variable gain amplifier is constant;
• a transmission processing unit, comprising a power amplifier connected to the first signal transmitting path, a second phase shifter provided at a front-end circuit of the power amplifier, and a second variable gain amplifier provided at a front-end circuit of the second phase shifter, wherein a phase of the second variable gain amplifier is constant;
• and
• a transmission unit connected to the first phase shifter and the second variable gain amplifier, the transmission unit comprising a transmission line and a plurality of passive phase adjustors, the plurality of passive phase adjustors individually provided correspondingly to the transmission line and controlled to change a phase shifting angle of an RF signal on the transmission line.