Communication device and method for enhancing impedance bandwidth of antenna thereof

1. A communication device, comprising:

at least one ground plane;

at least one antenna, electrically connected to the at least one ground plane through a signal source, and generating at least one operating band for transceiving electromagnetic signals of at least one communication band;

a current-drawing conductor structure, having a plurality of conductor elements comprising a first conductor element coupling to a first extending conductor portion through a first dielectric substrate to form a first mutual coupling portion, and the first extending conductor portion is connected to a second conductor element which is neighboring to the first conductor element, wherein the first conductor element is on bottom side of the first dielectric substrate and the first extending conductor portion which is not directly connected to the first conductor element is on top side of the first dielectric substrate, wherein a coupling space of the first mutual coupling portion between the first extending conductor portion and the first conductor element is less than 1% of a wavelength of a lowest operating frequency of a lowest operating band of the antenna; and

at least one coupling conductor structure, having a first conductor portion and a second conductor portion, wherein one end of the first conductor portion is electrically connected to the at least one ground plane, and another end thereof is electrically connected to the second conductor portion, and the second conductor portion is disposed between the at least one ground plane and the conductor elements of the current-drawing conductor structure and indirectly connected to the ground plane via the first conductor portion to form at least one coupling portion with the conductor elements simultaneously,

wherein the shortest distance between the source and the position where the first conductor portion is electrically connected to the ground is less than a half wavelength of a lowest operating frequency of a lowest operating band of the antenna.

2. The communication device as claimed in claim 1 , wherein the first conductor element and the first extending conductor portion are formed on both sides of the dielectric substrate.

3. The communication device as claimed in claim 1 , wherein the conductor elements are metal sheets of different shapes.

4. The communication device as claimed in claim 1 , wherein the conductor elements are metal sheets of the same shape.

5. The communication device as claimed in claim 1 , wherein the conductor elements have a plurality of metal branches.

6. The communication device as claimed in claim 1 , wherein the second conductor portion has a plurality of metal branches.

7. The communication device as claimed in claim 1 , wherein one of the conductor elements is electrically connected to the at least one ground.

8. The communication device as claimed in claim 1 , wherein a matching circuit is connected between the at least one antenna and the source.

9. The communication device as claimed in claim 1 , wherein the conductor elements are different metal materials, metal electrodes, or electrodes of a solar photovoltaic conversion apparatus.

10. The communication device as claimed in claim 1 , further comprising a casing, wherein the current-drawing conductor structure is disposed outside the casing, the at least one coupling conductor structure and the at least one antenna are disposed inside the casing.

11. A method for enhancing impedance bandwidth of antenna, adapted to a communication device, and the method for enhancing impedance bandwidth of antenna comprising:

disposing a current-drawing conductor structure on a casing of the communication device having at least one antenna and at least one ground plane, wherein the current-drawing conductor structure comprising a first conductor element coupling to a first extending conductor portion through a first dielectric substrate to form a mutual coupling portion, and the first extending conductor portion is connected to a second conductor element which is neighboring to the first conductor element, wherein the first conductor element is on bottom side of the first dielectric substrate and the first extending conductor portion which is not directly connected to the first conductor element is on top side of the first dielectric substrate, wherein a coupling space of the first mutual coupling portion between the first extending conductor portion and the first conductor element is less than 1% of a wavelength of a lowest operating frequency of a lowest operating band of the antenna; and

connecting a coupling conductor structure to the ground plane, wherein the coupling conductor structure has a first conductor portion and a second conductor portion, one end of the first conductor portion is electrically connected to the ground plane, and another end thereof is electrically connected to the second conductor portion, and the second conductor portion is disposed between the at least one ground plane and the conductor elements of the current-drawing conductor structure and indirectly connected to the ground plane via the first conductor portion to form at least one coupling portion with the conductor elements simultaneously,

wherein the shortest distance between the source and the position where the first conductor portion is electrically connected to the ground is less than a half wavelength of a lowest operating frequency of a lowest operating band of the antenna.

12. The method for enhancing impedance bandwidth of antenna as claimed in claim 11 , wherein the antenna is connected to the ground through a source, and the antenna generates at least one operating band for transmitting or receiving electromagnetic signals of at least one communication band.

13. The method for enhancing impedance bandwidth of antenna as claimed in claim 11 , wherein the first conductor element and the first extending conductor portion are formed on both sides of the dielectric substrate.

14. The method for enhancing impedance bandwidth of antenna as claimed in claim 11 , wherein the conductor elements are metal sheets of different shapes.

15. The method for enhancing impedance bandwidth of antenna as claimed in claim 11 , wherein the conductor elements are metal sheets of the same shape.

16. The method for enhancing impedance bandwidth of antenna as claimed in claim 11 , wherein the conductor elements have a plurality of metal branches.

17. The method for enhancing impedance bandwidth of antenna as claimed in claim 11 , wherein the second conductor portion has a plurality of metal branches.

18. The method for enhancing impedance bandwidth of antenna as claimed in claim 11 , wherein the conductor elements are different metal materials, metal electrodes, or electrodes of a solar photovoltaic conversion apparatus.

19. The device of claim 1 further comprising a second extending conductor disposed on top side of a second dielectric substrate to form a second mutual coupling portion with the second conductor element disposed on the bottom side of the second dielectric substrate as the second mutual coupling portion is connected to the first extending conductor portion.