Planar antenna

1. An antenna comprising:

a dielectric substrate;

a grounding plane formed on said dielectric substrate and having a connecting end;

first and second grounding elements formed on said dielectric substrate and having a curved shape and a size that are identical, each of said first and second grounding elements having a first end connected to said connecting end of said grounding plane, and a second end opposite to said first end thereof; and

first and second radiating elements formed on said dielectric substrate, having a curved shape and a size that are identical, operable in the same frequency range, and connected to said second ends of said first and second grounding elements, respectively, each of said first and second radiating elements having a first end, and a second end that is opposite to said first end thereof and that is disposed between said first end of a respective one of said first and second grounding elements and said first end thereof.

2. The antenna as claimed in claim 1 , wherein said connecting end of said grounding plane is tapered and has a tip, and said first end of each of said first and second grounding elements is connected to said tip of said connecting end of said grounding plane.

3. The antenna as claimed in claim 1 , wherein said dielectric substrate has a generally rectangular shape, and includes opposite first and second edges,

said grounding plane extending from said first edge toward said second edge of said dielectric substrate,

said connecting end of said grounding plane being distal from said first edge of said dielectric substrate.

4. The antenna as claimed in claim 1 , wherein each of said first and second grounding elements includes first and second segments,

said first segment of each of said first and second grounding elements defining said first end of the respective one of said first and second grounding elements, said first end of said first segment of each of said first and second grounding elements being distal from said second segment of the respective one of said first and second grounding elements,

said second segment of each of said first and second grounding elements defining said second end of the respective one of said first and second grounding elements, said second end of said second segment of each of said first and second grounding elements being distal from said first segment of the respective one of said first and second grounding elements,

said first segments of said first and second grounding elements diverging from said connecting end of said grounding plane,

said second segments of said first and second grounding elements extending away from each other.

5. The antenna as claimed in claim 1 , further comprising first and second feeding points, each of which is provided on said second end of a respective one of said first and second radiating elements.

6. The antenna as claimed in claim 5 , wherein each of said first and second radiating elements includes first and second segments, and a third segment disposed between said first and second segments thereof,

said first segment of each of said first and second radiating elements defining said first end of the respective one of said first and second radiating elements, said first end of said first segment of each of said first and second radiating elements being distal from said third segment of the respective one of said first and second radiating elements,

said second segment of each of said first and second radiating elements defining said second end of the respective one of said first and second radiating elements, said second end of said second segment of each of said first and second radiating elements being distal from said third segment of the respective one of said first and second radiating elements,

said second segments of said first and second radiating elements diverging from said first and second feeding points, respectively,

said third segments of said first and second radiating elements extending away from each other,

said first segment of each of said first and second radiating elements extending transversely to said third segment of the respective one of said first and second radiating elements,

said second end of each of said first and second grounding elements being connected to a junction of said second and third segments of the respective one of said first and second radiating elements.

7. The antenna as claimed in claim 6 , wherein said first segment of said first radiating element is formed approximately in the shape of an axe.

8. The antenna as claimed in claim 5 , further comprising a feeding line having a positive terminal coupled to said first feeding point, and a negative terminal coupled to said connecting end of said grounding plane.

9. The antenna as claimed in claim 5 , further comprising a feeding line having a positive terminal coupled to said second feeding point, and a negative terminal coupled to said connecting end of said grounding plane.

10. The antenna as claimed in claim 1 , wherein said first and second grounding elements cooperatively define a slot therebetween.

11. The antenna as claimed in claim 10 , wherein said slot has a generally triangular shape.

12. The antenna as claimed in claim 1 , wherein said first and second grounding elements are symmetrical.

13. The antenna as claimed in claim 1 , wherein said first and second radiating elements are symmetrical.

14. The antenna as claimed in claim 1 , wherein the frequency range covers frequencies from 2300 MHz to 2700 MHz.

15. The antenna as claimed in claim 1 , wherein said first radiating element has a length of one-quarter wavelength in the frequency range.