Antenna apparatus and electronic device having the same

1. An antenna apparatus comprising:

a plurality of antennas; and

a printed circuit board connected to the plurality of antennas,

wherein the printed circuit board comprises a plurality of feeding units respectively connected to the plurality of antennas and a plurality of ground units respectively connected to the plurality of antennas, and

wherein each of the ground units is separated from the other ground units by means of at least one slot.

2. The antenna apparatus according to claim 1 , further comprising at least one lump element which electrically connects the plurality of ground units.

3. The antenna apparatus according to claim 2 , wherein the at least one lump element is a capacitor.

4. The antenna apparatus according to claim 2 , wherein the at least one lump element is one of a resistor and an inductor.

5. The antenna apparatus according to claim 1 , wherein the plurality of antennas are Multiple Input Multiple Output (MIMO) antennas.

6. The antenna apparatus according to claim 1 , wherein the plurality of antennas comprise at least two antennas selected from a mobile communication antenna for cellular communication, a Bluetooth antenna, a wireless Local Area Network (LAN) antenna, and a Global Positioning System (GPS) antenna.

7. The antenna apparatus according to claim 1 , wherein the at least one slot separates the plurality of ground units of the printed circuit board so that each of the plural antennas is provided with completely electrically separated ground units.

8. The antenna apparatus according to claim 1 , wherein the plurality of feeding units are located at a pill-cut region of the printed circuit board.

9. The antenna apparatus according to claim 1 , wherein the at least one slot comprises a plurality of slots and wherein each of the ground units is separated from the other ground units by means of at least one of the plurality of slots.

10. The antenna apparatus according to claim 1 , wherein the plurality of antennas are located adjacent to each other.

11. An electronic device comprising:

a plurality of antennas;

a plurality of feeding units formed on a printed circuit board and respectively connected to the plurality of antennas;

a ground plane formed on the printed circuit board; and

a plurality of floating ground planes that are formed by at least one slot that electrically separates each of the floating ground planes and the ground plane.

12. The electronic device according to claim 11 , wherein the printed circuit board further comprises at least one circuit element that electrically connects the plurality of floating ground planes and the ground plane.

13. The electronic device according to claim 12 , wherein the at least one circuit element comprises one of a capacitor, a resistor, and an inductor.

14. The electronic device according to claim 12 ,

wherein the plurality of antennas comprise a first antenna and a second antenna, and

wherein the at least one circuit element is configured to isolate radiation of signals between the first antenna and the second antenna.

15. The electronic device according to claim 12 , wherein the plurality of floating ground planes comprises a first floating ground plane and a second floating ground plane,

wherein the at least one circuit element comprises a first circuit element and a second circuit element,

wherein the first floating ground plane is coupled to the ground plane via the first circuit element, and

wherein the second floating ground plane is coupled to the ground plane via the second circuit element.

16. The electronic device according to claim 15 ,

wherein the plurality of floating ground planes further comprises a third floating ground plane,

wherein the at least one circuit element further comprises a third circuit element and a fourth circuit element,

wherein the third floating ground plane is coupled to the first floating ground plane via the third circuit element, and

wherein the third floating ground plane is coupled to the second floating ground plane via the fourth circuit element.

17. The electronic device according to claim 11 , wherein the plurality of feeding units are located at a pill-cut region of the printed circuit board.

18. The electronic device according to claim 11 , wherein the at least one slot separates the plurality of floating ground planes so that each of the plural antennas is provided with completely electrically separated ground planes.

19. The electronic device according to claim 11 , wherein the at least one slot comprises a first slot and a second slot,

wherein the first slot separates the ground plane from each of the floating ground planes, and

wherein the second slot separates each of the floating ground planes.

20. The electronic device according to claim 11 , wherein the plurality of antennas are located adjacent to each other.

21. An electronic device comprising:

a plurality of antennas located adjacent to each other;

a plurality of feeding units, each of which is connected to the plurality of antennas and is formed on a printed circuit board;

a plurality of ground units, each of which is connected to the plurality of antennas; and

at least one capacitor which electrically connects the plurality of ground units,

wherein the plurality of ground units are formed by separating a ground unit of the printed circuit board by means of at least one slot.