RADIO FREQUENCY FRONT END, TERMINAL APPARATUS, AND CARRIER AGGREGATION METHOD

A radio frequency front end, a terminal device, and a carrier aggregation method are provided. The radio frequency front end includes: P transmit branches, where each transmit branch is used to transmit a carrier modulation signal on one of M different frequency bands, each transmit branch includes at least one transmit filter, and a frequency band on which a carrier is allowed by the transmit filter to pass is consistent with the at least one frequency band on which transmitting is performed on each transmit branch; N receive branches, where each receive branch is used to receive a carrier modulation signal on at least one of the M different frequency bands, each receive branch includes at least one receive filter, and a frequency band on which a carrier is allowed by the receive filter to pass is consistent with the at least one frequency band on which receiving is performed on each receive branch; and a switch circuit having L input ports and at least one output port, where the output port is connected to an antenna or a back end circuit of an antenna, and the L input ports are used to simultaneously connect a transmit branch of the P transmit branches and a receive branch of the N receive branches, where the transmit branch and the receive branch are corresponding to a same frequency band.