Abstract: The present invention discloses a phase shifter, which comprises at least two layered chambers, wherein, in each chamber two parallel-arranged metal guide sleeves and a U-shaped conductor are set, the two free ends of the U-shaped conductor are respectively inserted into the two metal guide sleeves, and the free ends of the U-shaped conductor move relatively to the metal guide sleeves so as to change the phase of the output signal of the phase shifter. Using the phase shifter provided in the present invention enables the phase control of each radiating element to be very convenient. Furthermore, the phase shifter is simple in structure and inexpensive.