Phase shifter assembly, cavity phase shifter with phase shifter assembly and base station antenna

A phase shifter assembly, the phase shifter assembly comprising:

• a phase shift circuit;
• and
• a dielectric assembly having at least one dielectric element movable relative to the phase shift circuit, the at least one dielectric element comprises a first dielectric component and a second dielectric component on opposite sides of the phase shift circuit, the first dielectric component and the second dielectric component respectively comprise a dielectric base and bosses and/or ribs protruding from the dielectric base towards one another, and the first dielectric component and the second dielectric component are respectively spaced apart from the phase shift circuit by a set distance by means of the bosses and/or ribs,
• wherein the bosses and/or ribs are disposed on two side regions in a transverse direction of the corresponding dielectric bases, the sides of the first dielectric component and the second dielectric component facing each other, and intermediate regions in the transverse direction of the dielectric bases of the first dielectric component and the second dielectric component are respectively spaced apart from the phase shift circuit by a set distance to form a gap, the phase shift circuit residing within the gap, and
• wherein concave portions are respectively provided in the intermediate regions in the transverse direction of the dielectric bases of the first dielectric component and the second dielectric component.