Array antenna optimized for a base station communication system

1. An antenna comprising:

at least one first radiator for a first frequency band;

one or more second radiator for a second frequency band; and

a third radiator,

wherein the third radiator is used when realizing the first frequency band and is also used when realizing the second frequency band; and

wherein the third radiator is arranged between the at least one first radiator and the one or more second radiator, and wherein the at least one first radiator, the third radiator, and the one or more second radiator are arranged in series over a reflector plate.

2. The antenna of claim 1 , further comprising:

a first phase shifter electrically connected with the at least one radiator;

a second phase shifter electrically connected with the one or more second radiator; and

a diplexer,

wherein the first phase shifter supplies power to the third radiator through a first conductive line of the diplexer when realizing the first frequency band, and the second phase shifter supplies power to the third radiator through a second conductive line of the diplexer when realizing the second frequency band.

3. The antenna of claim 1 , wherein the third radiator has a same structure as that of a radiator for a low frequency band from among the frequency bands.

4. The antenna of claim 1 , wherein the at least one first radiator and the one or more second radiator are arranged in parallel over a reflector plate such that the at least one first radiator and the one or more second radiator face each other.

5. The antenna of claim 4 , wherein the third radiator is arranged in a staggered manner with respect to the at least one first radiator and the one or more second radiator.

6. The antenna of claim 1 , further comprising:

fourth radiators for a third frequency band,

wherein the at least one first radiator is arranged respectively within some of the fourth radiators, the one or more second radiator are arranged respectively within some of the fourth radiators, and the third radiator is arranged within another of the fourth radiators.

7. An antenna comprising:

at least one first radiator; and

one or more second radiator,

wherein the at least one first radiator and the one or more second radiator are used for a first frequency band, and only the one or more second radiator from among the radiators are used when realizing a second frequency band; and

wherein the at least one first radiator and the one or more second radiator are arranged in parallel over a reflector plate such that the at least one first radiator and the one or more second radiator face each other.

8. The antenna of claim 7 , further comprising:

a first phase shifter; and

a second phase shifter,

wherein the first phase shifter is electrically connected with the at least one first radiator and the one or more second radiator, and the second phase shifter is electrically connected with only the one or more second radiator.

9. The antenna of claim 8 , further comprising dividers, wherein the first phase shifter dividers power by way of the dividers to the at least one first radiator and the one or more second radiator.

10. An antenna comprising radiators, wherein some of the radiators are operated when realizing a first frequency band, some of the radiators are operated when realizing a second frequency band, and at least one of the radiators are used both when realizing the first frequency band and when realizing the second frequency band; and

wherein power supplied to the radiator used both when realizing the first frequency band and when realizing the second frequency band is different when realizing the first frequency band and when realizing the second frequency band.

11. The antenna of claim 10 , wherein the radiator used both when realizing the first frequency band and when realizing the second frequency band has a different structure from that of some of the radiators.

12. The antenna of claim 10 , wherein the radiators used both when realizing the first frequency band and when realizing the second frequency band are arranged adjacent to one another.

13. The antenna of claim 10 , wherein the radiator used both when realizing the first frequency band and when realizing the second frequency band is different according to the first frequency band and the second frequency band.