Millimeter wave array antenna and mobile terminal

1. A millimeter wave array antenna, comprising several antenna elements arranged in an array, wherein,

each of the antenna elements comprises a first radiation patch, a second radiation patch, a first grounding plate, a power divider layer and a second grounding plate stacked sequentially from top to bottom; wherein, the first radiation patch is spaced apart from and coupled to the second radiation patch, the second radiation patch is provided with two feeding ends, each of the feeding ends is provided with two feeding notches, and the power divider layer comprises two transmission lines, wherein, each of the transmission lines comprises one input port and two phase-inverted output ports electrically connected to the input port, the two phase-inverted output ports are respectively coupling-fed the two feeding notches of one of the feeding ends, and each of the antenna elements generates orthogonal polarization and dual-band resonance under excitation of two input ports, wherein the antenna element further comprises a first dielectric slab sandwiched between the first radiation patch and the second radiation patch, a second dielectric slab sandwiched between the second radiating patch and the first grounding plate, and a third dielectric slab sandwiched between the first grounding plate and the second grounding plate, wherein, the power divider layer is disposed within the third dielectric slab and spaced apart from the first grounding plate and the second grounding plate.

2. The millimeter wave array antenna according to claim 1 , wherein the antenna element further comprises four probes extending from the phase-inverted output ports of the power divider layer toward the second radiation patch, wherein, one end of each of the probes facing away from the power divider layer is received within one of the feeding notches and coupling-fed the second radiation patch.

3. The millimeter wave array antenna according to claim 2 , wherein the first radiation patch and the second radiation patch each have a square structure.

4. The millimeter wave array antenna according to claim 3 , wherein the two feeding notches of one of the feeding ends are located on one diagonal line of the second radiation patch, and the two feeding notches of the other feeding end are located on the other diagonal line of the second radiating patch.

5. The millimeter wave array antenna according to claim 1 , wherein the millimeter wave array antenna comprises four antenna elements, and the four antenna elements are arranged in a 1*4 array.

6. The millimeter wave array antenna according to claim 1 , wherein a size of the first radiation patch is smaller than that of the second radiation patch, and an orthographic projection of the first radiation patch to a surface where the second radiation patch is located falls within the second radiation patch.

7. The millimeter wave array antenna according to claim 1 , wherein the second grounding plates of respective antenna elements are integrally formed.

8. A mobile terminal comprising a millimeter wave array antenna, the millimeter wave array antenna comprising several antenna elements arranged in an array, wherein,

each of the antenna elements comprises a first radiation patch, a second radiation patch, a first grounding plate, a power divider layer and a second grounding plate stacked sequentially from top to bottom; wherein, the first radiation patch is spaced apart from and coupled to the second radiation patch, the second radiation patch is provided with two feeding ends, each of the feeding ends is provided with two feeding notches, and the power divider layer comprises two transmission lines, wherein, each of the transmission lines comprises one input port and two phase-inverted output ports electrically connected to the input port, the two phase-inverted output ports are respectively coupling-fed the two feeding notches of one of the feeding ends, and each of the antenna elements generates orthogonal polarization and dual-band resonance under excitation of two input ports, wherein the antenna element further comprises a first dielectric slab sandwiched between the first radiation patch and the second radiation patch, a second dielectric slab sandwiched between the second radiating patch and the first grounding plate, and a third dielectric slab sandwiched between the first grounding plate and the second grounding plate, wherein, the power divider layer is disposed within the third dielectric slab and spaced apart from the first grounding plate and the second grounding plate.

9. The mobile terminal according to claim 8 , wherein the antenna element further comprises four probes extending from the phase-inverted output ports of the power divider layer toward the second radiation patch, wherein, one end of each of the probes facing away from the power divider layer is received within one of the feeding notches and coupling-fed the second radiation patch.

10. The mobile terminal according to claim 9 , wherein the first radiation patch and the second radiation patch each have a square structure.

11. The mobile terminal according to claim 10 , wherein the two feeding notches of one of the feeding ends are located on one diagonal line of the second radiation patch, and the two feeding notches of the other feeding end are located on the other diagonal line of the second radiating patch.

12. The mobile terminal according to claim 8 , wherein the millimeter wave array antenna comprises four antenna elements, and the four antenna elements are arranged in a 1*4 array.

13. The mobile terminal according to claim 8 , wherein a size of the first radiation patch is smaller than that of the second radiation patch, and an orthographic projection of the first radiation patch to a surface where the second radiation patch is located falls within the second radiation patch.

14. The mobile terminal according to claim 8 , wherein the second grounding plates of respective antenna elements are integrally formed.