Multi-band dual-polarized antenna structure and wireless communication device using the same

1. A multi-band dual-polarized antenna structure, comprises:

a first antenna array arranged in a first row and operating at a first frequency;

a second antenna array arranged in a second row, operating at a second frequency and having a first polarized direction; and

a third antenna array arranged in the second row, operating at the second frequency and having a second polarized direction different from the first polarized direction;

wherein the second antenna array shares at least one common antenna element with the third antenna array, and a first interval between the second antenna element and the common antenna element closest to the second antenna element is smaller than a second interval between adjacent two common antenna elements.

2. The multi-band dual-polarized antenna structure as claimed in claim 1 , wherein the multi-band dual-polarized antenna structure further comprise a common antenna element.

3. The multi-band dual-polarized antenna structure as claimed in claim 2 , wherein the first antenna array comprises a plurality of first antenna elements, the common antenna element is disposed corresponding to an interval between adjacent two first antenna elements.

4. The multi-band dual-polarized antenna structure as claimed in claim 3 , wherein the common antenna element partly overlaps the first antenna elements in a column direction perpendicular to the first row.

5. The multi-band dual-polarized antenna structure as claimed in claim 2 , wherein the common antenna element has the first polarized direction and the second polarized direction.

6. The multi-band dual-polarized antenna structure as claimed in claim 2 , further comprises:

a plurality of antenna rows each comprising the second antenna array and the third antenna array;

wherein the first antenna array is disposed between two of the antenna rows.

7. The multi-band dual-polarized antenna structure as claimed in claim 6 , wherein one of the antenna rows operates at the second frequency, and another of the antenna rows operates at a third frequency different from the second frequency.

8. The multi-band dual-polarized antenna structure as claimed in claim 1 , wherein the second antenna array comprises a second antenna element disposed on an end of the second row, the third antenna array comprises a third antenna element disposed on another end of the second row, and the second antenna element and the third antenna element each has single-polarized direction.

9. The multi-band dual-polarized antenna structure as claimed in claim 8 , wherein shape of the second antenna element is same as that of the third antenna element, but posture of the second antenna element is different from that of the third antenna element.

10. The multi-band dual-polarized antenna structure as claimed in claim 8 , wherein the first antenna array comprises a plurality of first antenna elements, the second antenna element partly overlaps one of the first antenna elements along a column direction perpendicular to the second row, the third antenna element partly overlaps another of the first antenna elements along the column direction.

11. The multi-band dual-polarized antenna structure as claimed in claim 1 , wherein the first frequency is lower than the second frequency.

12. The multi-band dual-polarized antenna structure as claimed in claim 1 , wherein the first antenna array comprises a first antenna element which is a single-polarized antenna, dual-polarized antenna or multi-polarized antenna.

13. The multi-band dual-polarized antenna structure as claimed in claim 1 , further comprises:

a first antenna matrix comprising a plurality of the first antenna arrays;

wherein the whole of the second antenna array and the third antenna array is disposed between two of the first antenna arrays.