Rf system and electronic device

An electronic device comprising an RF system, wherein the RF system is configured to implement transmission and reception in a first LB, a first MB, and a first HB, and to implement transmission and reception in a second LB, a second MB, and a second HB, when the RF system operates in the NSA mode, wherein:

• the RF system comprises an RF transceiver, an RF processing circuit coupled with the RF transceiver, a transfer switch module coupled with the RF processing circuit, a first antenna, a second antenna, a third antenna, and a fourth antenna, wherein the transfer switch module is coupled with the first antenna, the second antenna, the third antenna, and the fourth antenna, and efficiency of the first antenna and the second antenna is higher than efficiency of the third antenna and the fourth antenna;
• when the RF system operates in an NSA mode, the first antenna is used for transmission in a first LB, a first MB, and a first HB and primary reception in the first LB, the first MB, and the first HB, the second antenna is used for transmission in a second LB, a second MB, and a second HB and primary reception in the second LB, the second MB, and the second HB, the third antenna is used for diversity reception in the second LB, the second MB, and the second HB, and the fourth antenna is used for diversity reception in the first LB, the first MB, and the first HB;
• and
• the first LB, the first MB, and the first HB are LTE bands, the second LB, the second MB, and the second HB are NR bands, the first antenna, the second antenna, the third antenna and the fourth antenna are configured to support LB+LB EN-DC and MHB+MHB EN-DC of LTE bands and NR bands simultaneously.