Antenna and base station device

A base station device, comprising:

• a plurality of first frequency band antenna groups that each comprise a phase shifter and a plurality of first frequency band radiating elements;
• and
• a reflection plate having a plurality of reflection plate through holes corresponding to the respective first frequency band radiating elements;
• wherein each of the first frequency band radiating elements comprises:
• a first radiation structure located on a first side of the reflection plate;
• a first balun structure having a first part and a second part and passing through one of the plurality of reflection plate through holes that corresponds to the each of the first frequency band radiating elements, wherein the first part of the first balun structure is located on the first side of the reflection plate and the second part of the first balun structure is located on a second side of the reflection plate, the first part of the first balun structure is connected to the first radiation structure, and the first balun structure is spaced from the reflection plate;
• and
• a first signal transmission structure, wherein the first signal transmission structure is spaced from the first balun structure, and the first signal transmission structure passes through the reflection plate through hole;
• wherein the phase shifter is located on the second side of the reflection plate, the phase shifter comprises a first phase shifter cavity, a choke cavity, and a first feed network signal transmission structure located in the first phase shifter cavity, and the choke cavity and the first phase shifter cavity share a part of a cavity wall;
• in each of the first frequency band antenna groups, the second part of the first balun structure in each of the first frequency band radiating elements is located in the choke cavity;
• and
• in each of the first frequency band antenna groups, the first signal transmission structure in each of the first frequency band radiating elements is electrically connected to the first feed network signal transmission structure.