the present invention discloses an antenna diversity switch , used for receiving and transmitting rf signals for dual - mode co - existence wireless communication system . the antenna diversity switch comprises a first transmitting port ; a second transmitting port ; a receiving port ; a first control unit , electrically connected between the first transmitting port and a first antenna ; a second control unit , electrically connected between the first transmitting port and a second antenna ; a third control unit , electrically connected between the second transmitting port and the first antenna ; a forth control unit , electrically connected between the second transmitting port and the second antenna ; a fifth control unit , electrically connected between the receiving port and the first antenna ; a sixth control unit , electrically connected between the receiving port and the second antenna . the antenna diversity switch according to the present invention meets the requirement of ieee 802 . 11b / g wlan and bluetooth co - existence operation with reduction of three or four antennas in the prior art to two antennas . moreover , it provides antenna diversity for both wlan and bluetooth systems , where in the prior - art wlan and bluetooth co - existence system only wlan system has the antenna diversity .