Complex antenna

1. A complex antenna, configured to transmit or receive radio-frequency signals, comprising:

a first antenna unit; and

a second antenna unit;

wherein the first antenna unit is fixed to the second antenna unit with a first included angle, and the complex antenna does not have a closed annular structure;

wherein the first included angle is related to a gain value and a beam coverage rate of the complex antenna operated in a combined-beam mode.

2. The complex antenna of claim 1 , wherein the first included angle is in a range of 70 degrees to 150 degrees.

3. The complex antenna of claim 1 , wherein the first antenna unit and the second antenna unit have identical structures and sizes.

4. The complex antenna of claim 1 , wherein each of the first antenna unit and the second antenna unit comprises:

a reflective unit, comprising:

a central reflective element; and

a plurality of peripheral reflective elements enclosing the central reflective element to form a frustum structure;

at least one antenna element, each of the at least one antenna element comprising:

at least one radiation unit disposed above the central reflective element; and

a reflective plate disposed above the at least one radiation unit, wherein a geometrical shape of the reflective plate has symmetry.

5. The complex antenna of claim 4 , wherein the first included angle exists between the central reflective element of the first antenna unit and the central reflective element of the second antenna unit.

6. The complex antenna of claim 4 , wherein there is a frustum angle between each peripheral reflective element of the plurality of peripheral reflective elements and the central reflective element, and the frustum angle is in a range of 90 degrees to 180 degrees.

7. The complex antenna of claim 4 , wherein a geometrical shape of the reflective plate is a circle or a regular polygon, and a number of vertices of the regular polygon is a multiple of 4.

8. The complex antenna of claim 4 , wherein a first conductor plate and a second conductor plate of the at least one radiation unit form a diamond dipole antenna structure.

9. The complex antenna of claim 1 , wherein each of the first antenna unit and the second antenna unit has an array antenna structure.

10. The complex antenna of claim 4 , wherein the central reflective element of the first antenna unit and the central reflective element of the second antenna unit are perpendicular to a first plane, and a projection of the complex antenna onto the first plane is symmetrical with respect to a symmetrical axis.