A wireless communication device is provided. The wireless communication device comprises: a first antenna for receiving and transmitting a first sub-band signal of a first frequency band and a second sub-band signal of the first frequency band; a second antenna for receiving and transmitting the second sub-band signal and a second frequency band signal; a third antenna for receiving and transmitting a first sub-band diversity signal of the first frequency band; a first frequency-division multiplex coupled to the first antenna; a switching circuit coupled to the first frequency-division multiplex and the second antenna; a primary path component coupled to the first frequency-division multiplex and the switching circuit; a secondary path component coupled to the switching circuit and the third antenna; a first transceiver coupled to the primary path component and the secondary path component; and a second transceiver coupled to the switching circuit.