High-frequency oscillator assembly and base station antenna

A base station antenna, comprising:

• a reflector;
• and
• a high-frequency oscillator assembly, comprising:
• a balun supporting component comprising two balun supporting plates, one of which being assembled with the other in a cross arrangement, each of the balun supporting plates comprising a first surface and a second surface opposite to the first surface, the first surface of each of the balun supporting plates comprising a feeder circuit comprising a transmission line and a feeder line, the second surface of each of the balun supporting plates comprising a first open-circuit filtering branch, the transmission line of each of the balun supporting plates being disposed on one side of the other balun supporting plate, the feeder line of each of the balun supporting plates being disposed on the other side of the other balun supporting plate, the first open-circuit filtering branch and the feeder line of each of the balun supporting plates being electrically connected;
• and
• a baseplate disposed on the balun supporting component, comprising a plurality of oscillator arms, the feeder lines of each of the balun supporting plates being electrically connected with the corresponding oscillator arms respectively;
• wherein one ends of the transmission line and the feeder line are close to the baseplate;
• the horizontal distance between any point on the outermost edge of the transmission line and the other balun supporting plate is decreasing along a direction from one end of the balun supporting plate away from the baseplate toward one end of the balun supporting plate close to the baseplate;
• wherein the high-frequency oscillator assembly is disposed on the reflector.