Radio-frequency front-end circuit and communication device

A radio-frequency front-end circuit configured to simultaneously transfer a first radio-frequency signal of a first communication system and a second radio-frequency signal of a second communication system, the second communication system being different than the first communication system, the radio-frequency front-end circuit comprising:

• a first transfer circuit configured to transfer the first radio-frequency signal;
• a second transfer circuit configured to transfer the second radio-frequency signal;
• and
• a first switch comprising a first antenna terminal connected to a first antenna, a second antenna terminal connected to a second antenna, and at least two selection terminals, the second antenna being different than the first antenna,
• wherein the at least two selection terminals of the first switch comprise a first selection terminal connected to the first transfer circuit, and a second selection terminal connected to the second transfer circuit,
• wherein the first transfer circuit comprises:
• a first power amplifier configured to amplify the first radio-frequency signal of the first communication system;
• a first low-noise amplifier configured to amplify the first radio-frequency signal of the first communication system;
• and
• a transmission and reception selector switch configured to exclusively switch between connecting an output terminal of the first power amplifier to the first selection terminal, and connecting an input terminal of the first low-noise amplifier to the first selection terminal, and
• wherein the second transfer circuit comprises:
• a second power amplifier configured to amplify the second radio-frequency signal of the second communication system;
• a second low-noise amplifier configured to amplify the second radio-frequency signal of the second communication system;
• a transmission filter comprising an input terminal connected to an output terminal of the second power amplifier, and an output terminal connected to the second selection terminal;
• and
• a reception filter comprising an output terminal connected to an input terminal of the second low-noise amplifier, and an input terminal connected to the second selection terminal.

A radio-frequency front-end circuit configured to simultaneously transfer a first radio-frequency signal of a first communication system and a second radio-frequency signal of a second communication system, the second communication system being different than the first communication system, the radio-frequency front-end circuit comprising:

• a first transfer circuit configured to transfer the first radio-frequency signal;
• a second transfer circuit configured to transfer the second radio-frequency signal;
• and
• a first switch comprising a first antenna terminal connected to a first antenna, a second antenna terminal connected to a second antenna, and at least two selection terminals, the second antenna being different than the first antenna,
• wherein the at least two selection terminals of the first switch comprise a first selection terminal connected to the first transfer circuit, and a second selection terminal connected to the second transfer circuit,
• wherein the second transfer circuit comprises:
• a second power amplifier configured to amplify the second radio-frequency signal of the second communication system;
• a second low-noise amplifier configured to amplify the second radio-frequency signal of the second communication system;
• and
• a transmission and reception selector switch configured to exclusively switch between connecting an output terminal of the second power amplifier to the second selection terminal, and connecting an input terminal of the second low-noise amplifier to the second selection terminal, and
• wherein the first transfer circuit comprises:
• a first power amplifier configured to amplify the first radio-frequency signal of the first communication system;
• a first low-noise amplifier configured to amplify the first radio-frequency signal of the first communication system;
• a transmission filter comprising an input terminal connected to an output terminal of the first power amplifier, and an output terminal connected to the first selection terminal;
• and
• a reception filter comprising an output terminal connected to an input terminal of the first low-noise amplifier, and an input terminal connected to the first selection terminal.