A terminal device, comprising: a first antenna, a second antenna, a first channel electrically connected to the first antenna, and a second channel electrically connected to the second antenna, wherein: the first channel comprises at least two first transmitting branches (112,113) which are used to transmit carrier signals for Carrier Aggregation through the first antenna; and the second channel comprises a receiving branch electrically connected to the second antenna and a receiving filter electrically connected to the receiving branch, wherein the receiving branch is used to receive CA signals through the second antenna, and the receiving filter is used to filter the CA signals to obtain the carrier signals for CA, wherein the first channel comprises a switch circuit, one terminal of the switch circuit is electrically connected to the first antenna, and the other terminal of the switch circuit is electrically connected to the first transmitting branches, and wherein at least one of the first transmitting branches comprises a duplexer, wherein one terminal of the duplexer is electrically connected to said other terminal of the switch circuit, and the other terminal of the duplexer is electrically connected to a radio frequency chip, and wherein the terminal device further comprises a Balun, a first input terminal of the Balun is electrically connected to the duplexer in the at least one of the first transmitting branches, a second input terminal of the Balun is electrically connected to the receiving filter in the second channel, and an output terminal of the Balun is electrically connected to the radio frequency chip; and the Balun is configured to combine the same carrier signals for CA received by the at least one of the first transmitting branches and the second channel into an enhanced carrier signal. the first channel comprises at least two first transmitting branches (112,113) which are used to transmit carrier signals for Carrier Aggregation through the first antenna; and the second channel comprises a receiving branch electrically connected to the second antenna and a receiving filter electrically connected to the receiving branch, wherein the receiving branch is used to receive CA signals through the second antenna, and the receiving filter is used to filter the CA signals to obtain the carrier signals for CA, wherein the first channel comprises a switch circuit, one terminal of the switch circuit is electrically connected to the first antenna, and the other terminal of the switch circuit is electrically connected to the first transmitting branches, and wherein at least one of the first transmitting branches comprises a duplexer, wherein one terminal of the duplexer is electrically connected to said other terminal of the switch circuit, and the other terminal of the duplexer is electrically connected to a radio frequency chip, and wherein the terminal device further comprises a Balun, a first input terminal of the Balun is electrically connected to the duplexer in the at least one of the first transmitting branches, a second input terminal of the Balun is electrically connected to the receiving filter in the second channel, and an output terminal of the Balun is electrically connected to the radio frequency chip; and the Balun is configured to combine the same carrier signals for CA received by the at least one of the first transmitting branches and the second channel into an enhanced carrier signal.