A Radio Frequency, RF, circuit, comprising a first switch, a second switch, a third switch, a first phase shifter module, a second phase shifter module and a combiner, characterized in that: an input terminal of the first switch comprises a high-frequency port, the high-frequency port is configured to transmit and receive high-frequency RF signals, and the first phase shifter module is configured to be connected with the input terminal of the first switch; an input terminal of the second switch comprises a medium-frequency port, the medium-frequency port is configured to transmit and receive medium-frequency RF signals, and the second phase shifter module is configured to be connected with the input terminal of the second switch; an input terminal of the third switch comprises a low-frequency port, and the low-frequency port is configured to transmit and receive low-frequency RF signals; the first switch, the second switch, the third switch, the first phase shifter module and the second phase shifter module are encapsulated into a switch chip, and an output terminal of the first switch and an output terminal of the second switch are connected with each other outside the switch chip; and when the first switch is configured to connect the first phase shifter module with the combiner and the second switch is configured to connect the second phase shifter module with the combiner, the first phase shifter module is configured to adjust a phase shift amount of a high-frequency RF signal output by the high-frequency port to a first preset value and the second phase shifter module is configured to adjust a phase shift amount of a medium-frequency RF signal output by the medium-frequency port to a second preset value, to allow a transmission path for the high-frequency RF signal to be cut off relative to the medium-frequency RF signal and allow a transmission path for the medium-frequency RF signal to be cut off relative to the high-frequency RF signal, so as to perform Carrier Aggregation, CA, of the high-frequency RF signal and the medium-frequency RF signal to obtain a first aggregation signal, and the combiner is configured to perform CA of the first aggregation signal and a low-frequency RF signal. an input terminal of the first switch comprises a high-frequency port, the high-frequency port is configured to transmit and receive high-frequency RF signals, and the first phase shifter module is configured to be connected with the input terminal of the first switch; an input terminal of the second switch comprises a medium-frequency port, the medium-frequency port is configured to transmit and receive medium-frequency RF signals, and the second phase shifter module is configured to be connected with the input terminal of the second switch; an input terminal of the third switch comprises a low-frequency port, and the low-frequency port is configured to transmit and receive low-frequency RF signals; the first switch, the second switch, the third switch, the first phase shifter module and the second phase shifter module are encapsulated into a switch chip, and an output terminal of the first switch and an output terminal of the second switch are connected with each other outside the switch chip; and when the first switch is configured to connect the first phase shifter module with the combiner and the second switch is configured to connect the second phase shifter module with the combiner, the first phase shifter module is configured to adjust a phase shift amount of a high-frequency RF signal output by the high-frequency port to a first preset value and the second phase shifter module is configured to adjust a phase shift amount of a medium-frequency RF signal output by the medium-frequency port to a second preset value, to allow a transmission path for the high-frequency RF signal to be cut off relative to the medium-frequency RF signal and allow a transmission path for the medium-frequency RF signal to be cut off relative to the high-frequency RF signal, so as to perform Carrier Aggregation, CA, of the high-frequency RF signal and the medium-frequency RF signal to obtain a first aggregation signal, and the combiner is configured to perform CA of the first aggregation signal and a low-frequency RF signal.