Filtering apparatus, combining apparatus, antenna, and base station

A filtering apparatus, comprising:

• a first filtering unit circuit comprised of a first metal wire and a second metal wire;
• and
• a support mechanical part,
• wherein:
• the first filtering unit circuit is disposed on the support mechanical part;
• the first metal wire comprises a first coupling region, a second coupling region, and a first connecting region, and the first connecting region is connected between the first coupling region and the second coupling region;
• the second metal wire comprises a third coupling region, a fourth coupling region, and a second connecting region, and the second connecting region is connected between the third coupling region and the fourth coupling region;
• an orthographic projection of the first coupling region on a plane on which a surface of the third coupling region is located is at least partially located on the surface of the third coupling region, and the first coupling region is coupled to the third coupling region;
• an orthographic projection of the second coupling region on a plane on which a surface of the fourth coupling region is located is at least partially located on the surface of the fourth coupling region, and the second coupling region is coupled to the fourth coupling region;
• and
• the first coupling region is directly electrically connected to the fourth coupling region.

An antenna, comprising:

• a radiating element;
• and
• a filtering apparatus that is electrically connected to the radiating element, the filtering apparatus comprising:
• a first filtering unit circuit comprised of a first metal wire and a second metal wire;
• and
• a support mechanical part,
• wherein:
• the first filtering unit circuit is disposed on the support mechanical part;
• the first metal wire comprises a first coupling region, a second coupling region, and a first connecting region, and the first connecting region is connected between the first coupling region and the second coupling region;
• the second metal wire comprises a third coupling region, a fourth coupling region, and a second connecting region, and the second connecting region is connected between the third coupling region and the fourth coupling region;
• an orthographic projection of the first coupling region on a plane on which a surface of the third coupling region is located is at least partially located on the surface of the third coupling region, and the first coupling region is coupled to the third coupling region;
• an orthographic projection of the second coupling region on a plane on which a surface of the fourth coupling region is located is at least partially located on the surface of the fourth coupling region, and the second coupling region is coupled to the fourth coupling region;
• and
• the first coupling region is directly electrically connected to the fourth coupling region.