Dipole antenna device and dipole antenna system

1. A dipole antenna device, comprising:

a first metal piece, including at least one bending part, and a first feeding point;

a second metal piece, including at least one second bending part, and a second feeding point; and

a third metal piece, electrically connected to a first connection point of the first metal piece and a second connection point of the second metal piece;

wherein the third metal piece does not contact the first feeding point and the second feeding point, and the impedance matching or achievable bandwidth of the dipole antenna device corresponds to a distance between the third metal piece from the first feeding point, and a distance between the third metal piece and the second feeding point;

wherein the first metal piece and the second metal piece are not electrically connected to each other except the first connection point and the second connection point; wherein the first metal piece, the second metal piece and the third metal piece are constructed by stamping or cutting a single metal plate.

2. The dipole antenna device of claim 1 , wherein the ends of the first metal piece and the second metal piece are bent towards the same direction.

3. The dipole antenna device of claim 1 , wherein the ends of the first metal piece and the second metal piece are bent towards different directions.

4. A dipole antenna system, comprising:

a first metal piece, including at least one bending part, and a first feeding point;

a second metal piece, including at least one second bending part, and a second feeding point; and

a third metal piece, electrically connected to a first connection point of the first metal piece and a second connection point of the second metal piece, wherein the third metal piece does not contact the first feeding point and the second feeding point, and the impedance matching or achievable bandwidth of the dipole antenna system corresponds to a distance between the third metal piece and the first feeding point, and a distance between the third metal piece and the second feeding point; and

at least one transmission line, including an inner conductor and a outer braided shielding, electrically connected to the first feeding point and the second feeding point, respectively;

wherein the first metal piece and the second metal piece are not electrically connected to each other except the first connection point and the second connection point; wherein the first metal piece, the second metal piece and the third metal piece are constructed by stamping or cutting a single metal plate.

5. The dipole antenna system of claim 4 , wherein the ends of the first metal piece and the second metal piece are bent towards the same direction.

6. The dipole antenna system of claim 4 , wherein the ends of the first metal piece and the second metal piece are bent towards different directions.

7. A dipole antenna device, comprising:

a first metal piece, including at least one bending part, and a first feeding point;

a second metal piece, including at least one second bending part, and a second feeding point; and

a third metal piece, electrically connected to a first connection point of the first metal piece and a second connection point of the second metal piece, wherein the third metal piece has a length between the first connection point and the second connection point, and the impedance matching or achievable bandwidth of the dipole antenna device corresponds to the length between the first connection point and the second connection point, or a distance between the first metal piece and the second metal piece;

wherein the first metal piece and the second metal piece are not electrically connected to each other except the first connection point and the second connection point; wherein the first metal piece, the second metal piece and the third metal piece are constructed by stamping or cutting a single metal plate.

8. The dipole antenna device of claim 7 , wherein the ends of the first metal piece and the second metal piece are bent towards the same direction.

9. The dipole antenna device of claim 7 , wherein the ends of the first metal piece and the second metal piece are bent towards different directions.

10. A dipole antenna system, comprising:

a first metal piece, including at least one bending part, and a first feeding point;

a second metal piece, including at least one second bending part, and a second feeding point; and

a third metal piece, electrically connected to a first connection point of the first metal piece and a second connection point of the second metal piece, wherein the third metal piece has a length between the first connection point and the second connection point, and the impedance matching or achievable bandwidth of the dipole antenna system corresponds to the length between the first connection point and the second connection point, or a distance between the first metal piece and the second metal piece; and

at least one transmission line, including an inner conductor and a outer braided shielding, electrically connected to the first feeding point and the second feeding point, respectively;

wherein the first metal piece and the second metal piece are not electrically connected to each other except the first connection point and the second connection point; wherein the first metal piece, the second metal piece and the third metal piece are constructed by stamping or cutting a single metal plate.

11. The dipole antenna system of claim 10 , wherein the ends of the first metal piece and the second metal piece are bent towards the same direction.

12. The dipole antenna system of claim 10 , wherein the ends of the first metal piece and the second metal piece are bent towards different directions.