Multi-band base station antenna using selective shielding surface

1 . A multi-band base station antenna using a selective shielding surface, the multi-band base station antenna comprising:

a selective shielding surface which passes signals in a preset frequency band;

a plurality of low-band radiators located on the selective shielding surface;

a reflection plate disposed below the selective shielding surface and spaced apart from the selective shielding surface;

a plurality of high-band radiators coupled onto the reflection plate,

wherein the selective shielding surface has a pass band configured to pass signals emitted from the plurality of high-band radiators and block signals emitted from the plurality of low-band radiators,

wherein the selective shielding surface has a structure in which unit cells are repeatedly arranged, and each unit cell includes a plurality of sub-cells,

wherein each of the plurality of sub-cells includes a plurality of spiral arms having a structure that extends from a central point and is bent multiple times,

wherein the number of the spiral arms in each of the plurality of sub-cells corresponds to the number of vertices of a polygon corresponding to an overall shape of each of the plurality of sub-cells.

2 . The multi-band base station antenna using a selective shielding surface according to claim 1 ,

wherein a spiral arm of a specific sub-cell is connected to a spiral arm of another adjacent sub-cell.

3 . The multi-band base station antenna using a selective shielding surface according to claim 1 ,

wherein vertical selective shielding surfaces perpendicular to the selective shielding surface are coupled to both sides of the selective shielding surface, and the vertical selective shielding surfaces have a pass band configured to pass the signals emitted from the plurality of high-band radiators and block the signals emitted from the plurality of low-band radiators.

4 . A multi-band base station antenna using a selective shielding surface, the multi-band base station antenna comprising:

a selective shielding surface which passes signals in a preset frequency band; and

a plurality of first radiators located on top of the selective shielding surface,

wherein the selective shielding surface has a pass band configured to block signals of the plurality of first radiators,

wherein the selective shielding surface has a structure in which unit cells are repeatedly arranged, and each unit cell includes a plurality of sub-cells,

wherein each of the plurality of sub-cells includes a plurality of spiral arms having a structure that extends from a central point and is bent multiple times, and

wherein the number of the spiral arms in each of the plurality of sub-cells corresponds to the number of vertices of a polygon corresponding to an overall shape of each of the plurality of sub-cells.

5 . The multi-band base station antenna according to claim 4 ,

wherein the multi-band base station antenna further comprises a plurality of second radiators located below the selective shielding surface.

6 . The multi-band base station antenna according to claim 5 ,

wherein the selective shielding surface has a pass band configured to pass signals emitted from the plurality of second radiators.

7 . The multi-band base station antenna according to claim 4 ,

wherein a spiral arm of a specific sub-cell is connected to a spiral arm of another adjacent sub-cell.

8 . The multi-band base station antenna according to claim 6 ,

wherein vertical selective shielding surfaces perpendicular to the selective shielding surface are coupled to both sides of the selective shielding surface, and the vertical selective shielding surfaces have a pass band configured to pass the signals emitted from the plurality of second radiators and block the signals emitted from the plurality of first radiators.

9 . The multi-band base station antenna according to claim 8 ,

wherein a slot is formed in the vertical selective shielding surfaces.