Array antenna

1. An array antenna, configured to receive an input signal and radiate the received input signal in a form of an electromagnetic signal;

wherein the array antenna comprises a cavity power divider and a final-stage power dividing, coupling, and radiating unit assembled on the cavity power divider;

wherein the cavity power divider is configured to receive the input signal and perform power division on the input signal to output a first power-divided signal to the final-stage power dividing, coupling, and radiating unit;

wherein the final-stage power dividing, coupling, and radiating unit comprises a dielectric substrate, a first metal surface layer disposed on an upper surface of the dielectric substrate, and a second metal surface layer disposed on a lower surface of the dielectric substrate, a coupling slot array is formed on the second metal surface layer to receive the first power-divided signal, a radiating slot array corresponding to the coupling slot array is formed on the first metal surface layer, and several plated through-hole units are provided on the dielectric substrate; and

wherein the plated through-hole units go through the first and second metal surface layers vertically, and a range corresponding to each plated through-hole unit encloses a coupling slot in the coupling slot array and a radiating slot in the radiating slot array and corresponding to the coupling slot, so that final-stage power division is performed on the first power-divided signal received by the coupling slot array to output a second power-divided signal to the radiating slot array and that the radiating slot array radiates the second power-divided signal.

2. The array antenna according to claim 1 , wherein the array antenna further comprises a matching mechanical part, wherein the matching mechanical part is disposed between the cavity power divider and the final-stage power dividing, coupling, and radiating unit;

wherein the cavity power divider comprises a waveguide port and a power-divided signal output port;

wherein the waveguide port receives the input signal, so that the cavity power divider performs power division processing on the input signal, and the power-divided signal output port is configured to output the first power-divided signal;

wherein the matching mechanical part comprises a body part and a matching port formed on the body part; and

wherein the matching port corresponds to the power-divided signal output port and the coupling slot array, so that the power-divided signal output port is connected to a coupling slot of the final-stage power dividing, coupling, and radiating unit and that the first power-divided signal is transmitted to the coupling slot array.

3. The array antenna according to claim 2 , wherein a quantity of the matching ports is the same as a quantity of the power-divided signal output ports and a quantity of the coupling slots in the coupling slot array, and sizes of the matching ports are the same as sizes of the power-divided signal output ports and sizes of the corresponding coupling slots in the coupling slot array.

4. The array antenna according to claim 1 , further comprising an isolating mechanical part, wherein the isolating mechanical part comprises a board body and a through-hole array disposed on the board body;

wherein the through-hole array goes through a top and a bottom of the board body and corresponds to the radiating slot array;

wherein the bottom of the board body is disposed on the second metal surface layer;

wherein the through-hole array is interconnected with the radiating slot array;

wherein a projection of the radiating slot array on the board body is a first projection;

wherein a projection of the through-hole array on the board body is a second projection; and

wherein the first projection overlaps the second projection or the first projection is within the second projection.

5. The array antenna according to claim 4 , wherein both the radiating slot array and the through-hole array are 4×4 arrays and the coupling slot array is a 2×2 array.

6. The array antenna according to claim 4 , wherein the isolating mechanical part, the final-stage power dividing, coupling, and radiating unit, and the cavity power divider are assembled using positioning pins.

7. The array antenna according to claim 4 , wherein all through-holes in the through-hole array have a same size.

8. The array antenna according to claim 4 , wherein the board body is made of a metallic material.

9. The array antenna according to claim 4 , wherein the board body is made of a non-metallic material and all hole walls of the through-hole array are coated with a metal layer.

10. The array antenna according to claim 1 , wherein the dielectric substrate, the first metal surface layer, and the second metal surface layer are all in a square shape and have a same size.

11. A method of forming an array antenna, the array antenna being configured to receive an input signal and radiate the received input signal in a form of an electromagnetic signal, the method comprising:

forming a cavity power divider, wherein the cavity power divider is configured to receive the input signal and perform power division on the input signal to output a first power-divided signal to a final-stage power dividing, coupling, and radiating unit;

assembling the final-stage power dividing, coupling, and radiating unit on the cavity power divider, the assembling comprising:

providing a dielectric substrate;

disposing a first metal surface layer on an upper surface of the dielectric substrate;

disposing a second metal surface layer on a lower surface of the dielectric substrate;

forming a coupling slot array on the second metal surface layer, the coupling slot array being configured to receive the first power-divided signal;

forming a radiating slot array corresponding to the coupling slot array on the first metal surface layer; and

providing several plated through-hole units on the dielectric substrate, wherein the plated through-hole units go through the first and second metal surface layers vertically, and a range corresponding to each plated through-hole unit encloses a coupling slot in the coupling slot array and a radiating slot in the radiating slot array and corresponding to the coupling slot, so that final-stage power division is performed on the first power-divided signal received by the coupling slot array to output a second power-divided signal to the radiating slot array and that the radiating slot array radiates the second power-divided signal.

12. The method according to claim 11 , further comprising:

disposing a matching mechanical part between the cavity power divider and the final-stage power dividing, coupling, and radiating unit, the matching mechanical part comprising a body part and a matching port formed on the body part;

wherein forming the cavity power divider comprises forming a waveguide port and a power-divided signal output port, the waveguide port being configured to receive the input signal, so that the cavity power divider performs power division processing on the input signal, and the power-divided signal output port being configured to output the first power-divided signal; and

wherein the matching port corresponds to the power-divided signal output port and the coupling slot array, so that the power-divided signal output port is connected to a coupling slot of the final-stage power dividing, coupling, and radiating unit and that the first power-divided signal is transmitted to the coupling slot array.

13. The method according to claim 12 , wherein a quantity of the matching ports is the same as a quantity of the power-divided signal output ports and a quantity of the coupling slots in the coupling slot array, and sizes of the matching ports are the same as sizes of the power-divided signal output ports and sizes of the corresponding coupling slots in the coupling slot array.

14. The method according to claim 11 , further comprising forming an isolating mechanical part, wherein the isolating mechanical part comprises a board body and a through-hole array disposed on the board body;

wherein the through-hole array goes through a top and a bottom of the board body and corresponds to the radiating slot array;

wherein the bottom of the board body is disposed on the second metal surface layer;

wherein the through-hole array is interconnected with the radiating slot array;

wherein a projection of the radiating slot array on the board body is a first projection;

wherein a projection of the through-hole array on the board body is a second projection; and

wherein the first projection overlaps the second projection or the first projection is within the second projection.

15. The method according to claim 14 , wherein both the radiating slot array and the through-hole array are 4×4 arrays and the coupling slot array is a 2×2 array.

16. The method according to claim 14 , wherein the isolating mechanical part, the final-stage power dividing, coupling, and radiating unit, and the cavity power divider are assembled using positioning pins.

17. The method according to claim 14 , wherein all through-holes in the through-hole array have a same size.

18. The method according to claim 14 , wherein the board body is made of a metallic material.

19. The method according to claim 14 , wherein the board body is made of a non-metallic material and all hole walls of the through-hole array are coated with a metal layer.

20. The method according to claim 11 , wherein the dielectric substrate, the first metal surface layer, and the second metal surface layer are all in a square shape and have a same size.