Antenna structure

1 . An antenna structure electrically fixed and connected to a main board of an electronic apparatus and comprising:

a circuit board, being a square body with a front surface, a back surface, a top surface, a bottom surface, and two side surfaces;

a high-frequency radiation layer arranged on the front surface of the circuit board and comprising a high-frequency coupling edge thereon; and

a low-frequency radiation layer arranged on the back surface of the circuit board and comprising a low-frequency coupling edge thereon,

wherein the high-frequency radiation layer and the low-frequency radiation layer fail to overlap with each other.

2 . The antenna structure of claim 1 , wherein the high-frequency coupling edge comprises a high-frequency straight edge and a high-frequency oblique edge.

3 . The antenna structure of claim 2 , wherein the high-frequency radiation layer is arranged on the front surface of the circuit board; the circuit board further comprises a bare area on the back surface of the circuit board and corresponding to the high-frequency radiation layer; the antenna structure further comprises another high-frequency radiation layer arranged on the bare area; the another high-frequency radiation layer arranged on the bare area on the back surface overlaps with the high-frequency radiation layer on the front surface, and the another high-frequency radiation layer arranged on the bare area on the back surface is electrically connected to the high-frequency radiation layer on the front surface, to form a dual-path high-frequency radiation layer.

4 . The antenna structure of claim 3 , wherein the low-frequency radiation layer comprises a first low-frequency radiation layer and a second low-frequency radiation layer; the first low-frequency radiation layer is arranged on the back surface of the circuit board; the first low-frequency radiation layer comprises the low-frequency coupling edge; the low-frequency coupling edge comprises a low-frequency straight edge and a low-frequency oblique edge.

5 . The antenna structure of claim 4 , wherein the second low-frequency radiation layer is U-shaped and arranged on a naked area of the front surface of the circuit board, and overlaps with the first low-frequency radiation layer on the back surface of the circuit board, and is electrically connected to the first low-frequency radiation layer on the back surface of the circuit board, to form a dual-path low-frequency radiation layer.

6 . The antenna structure of claim 1 , wherein a frequency of the high-frequency radiation layer is 5.15 GHz to 5.85 GHz and 5.925 GHz to 7.125 GHz.

7 . The antenna structure of claim 1 , wherein a frequency of the low-frequency radiation layer is 2.4 GHz to 2.5 GHz.

8 . The antenna structure of claim 1 , wherein the high-frequency coupling edge and the low-frequency coupling edge are symmetrical or asymmetrical graphic designs.

9 . The antenna structure of claim 1 , wherein the high-frequency coupling edge and the low-frequency coupling edge are straight edges, oblique edges, or polygons, or a mixture of two or more shapes.

10 . The antenna structure of claim 1 , further comprising a coupling distance between the high-frequency coupling edge and the low-frequency coupling edge.

11 . The antenna structure of claim 10 , wherein the coupling distance is 0 mm to 8 mm.

12 . The antenna structure of claim 11 , wherein the coupling distance is 0 mm to 3 mm.

13 . The antenna structure of claim 1 , wherein the circuit board further comprises a plurality of semi-hole electrode layers on the bottom surface of the circuit board; one of the semi-hole electrode layers is electrically connected to the high-frequency radiation layer on the front surface of the circuit board and a first electrode layer on a bare area on the back surface; another one of the semi-hole electrode layers is electrically connected to the low-frequency radiation layer on the back surface of the circuit board and a second electrode layer on a naked area on the front surface.

14 . The antenna structure of claim 1 , wherein the circuit board further comprises a plurality of semi-hole electrode layers on the bottom surface of the circuit board; one of the semi-hole electrode layers is electrically connected to the high-frequency radiation layer on the front surface of the circuit board and another high-frequency radiation layer on a bare area on the back surface; another one of the semi-hole electrode layers is electrically connected to a first low-frequency radiation layer of the low-frequency radiation layer on the back surface of the circuit board and a second low-frequency radiation layer of the low-frequency radiation layer on a naked area of the front surface.

15 . The antenna structure of claim 14 , wherein the semi-hole electrode layers are semi-circular, semi-elliptical, or polygonal.

16 . The antenna structure of claim 1 , wherein the main board includes a first ground layer, a second ground layer, a first clearance zone, a second clearance zone, a first electrode fixed-connection layer, and a second electrode fixed-connection layer; the first ground layer is arranged on a front face of the main board; the second ground layer is arranged on a back face of the main board and is arranged symmetrically with the first ground layer; the first clearance zone is arranged on the front face of the main board; the second clearance zone is arranged on the back face of the main board and is arranged symmetrically with the first clearance zone; the first electrode fixed-connection layer and the second electrode fixed-connection layer are arranged on the first clearance zone; the main board further includes a signal feed-in layer arranged on the front face of the main board and coupled with the first ground layer; the signal feed-in layer is electrically connected to the first electrode fixed-connection layer.

17 . The antenna structure of claim 16 , wherein the main board further includes a plurality of matching elements; the first electrode fixed-connection layer and the second electrode fixed-connection layer are each electrically connected to the first ground layer through the matching elements; the matching elements are used to adjust an antenna characteristic of the antenna structure.

18 . The antenna structure of claim 16 , wherein the first clearance zone and the second clearance zone have a length of 10 mm to 20 mm and a width of 3 mm to 8 mm.