BIAS TEE AND SYSTEM FOR CONTROLLING ANTENNA

摘要

A bias tee includes a first port (601), a second port (602), a third port (603), a direct current blocking capacitor (604), a first inductance (605), a second inductance (607) and a modem (606). The second inductance (607) is used to transfer direct current signal between the first port (601) and the second port (602). A system for controlling antenna is also provided and includes a remote control unit RCU (902), an electricity controlled antenna (901), a tower mounted amplifier TMA (903), a bias tee (904) and a base station (905). According to the bias tee provided by present invention, when a non- electricity controlled antenna is upgradedto an electricity controlled antenna, there is no need to be replaced by STMA so as to decrease cost. Adding an electricity controlled antenna controller is avoided, so that the technique problem of poor applicability can be avoided when electricity controlled antenna controller is used, and the base station is not needed to provide connection interface, longer cable is not needed and the amount of mounting work is decreased.