Radio Frequency Circuit and Mobile Terminal

A radio frequency circuit comprising:

• a controller;
• and
• at least one duplexing module,
• wherein_the duplexing module comprises an impedance tuner and at least one transmitter-receiver unit,
• wherein the transmitter-receiver unit comprises a circulator, at least one radio frequency transmit path, at least one radio frequency receive path, a first directional coupler, and a second directional coupler,
• wherein the radio frequency transmit path is configured to receive a first transmit signal and perform filtering and amplifying processing on the first transmit signal to obtain a second transmit signal,
• wherein the first directional coupler is configured to receive the second transmit signal, use a part of the second transmit signal as a third transmit signal, directly send the third transmit signal to the circulator, and obtain, by means of coupling, a first coupling signal from the second transmit signal,
• wherein the circulator comprises a first port, a second port, and a third port that are arranged in sequence in a circular direction of the circulator,
• wherein the circulator is configured to receive the third transmit signal through the first port and output the third transmit signal through the second port,
• wherein the impedance tuner is configured to transmit, to an antenna port, the third transmit signal output from the second port of the circulator, and transmit, to the second port of the circulator, a first input signal from the antenna port,
• wherein the circulator is further configured to receive the first input signal through the second port and input the first input signal to the second directional coupler through the third port,
• wherein the second directional coupler is configured to use a part of the first input signal as a second input signal, directly send the second input signal to the radio frequency receive path, and obtain, by means of coupling, a second coupling signal from the first input signal, and
• wherein the radio frequency receive path is configured to perform filtering processing on the second input signal to obtain a third input signal, and
• wherein the controller is configured to adjust impedance of the impedance tuner according to the first coupling signal and the second coupling signal, so that impedance matching is achieved on the second port of the circulator.