Printed antenna

1. A printed antenna printed on a substrate for radiating and capturing radio frequency signals, the printed antenna comprising:

a feeding element;

a ground portion disposed beside the feeding element; and

a radiating portion, comprising:

a connecting patch electronically connected with the feeding element, a width of the connecting patch gradually decreasing in a direction toward the feeding element; and

a radiating patch with one end thereof electronically connected with the connecting patch; wherein a right-angled cutout is defined next to the connecting patch beside the feeding element.

2. The printed antenna as recited in claim 1 , wherein the feeding element is a conductive line.

3. The printed antenna as recited in claim 1 , wherein the radiating patch has an inverted V-shape.

4. The printed antenna as recited in claim 1 , wherein the radiating patch has at least two branches extending away from the connecting patch.

5. The printed antenna as recited in claim 4 , wherein the at least two branches are symmetrically defined mainly in the radiating patch.

6. An integrated antenna for radiating and capturing radio frequency signals, comprising:

a substrate having two opposite surfaces;

two printed antennas respectively disposed on the opposite surfaces of the substrate, each of the antennas comprising:

a feeding element;

a ground portion disposed beside the feeding element; and

a radiating portion, comprising:

a connecting patch electronically connected with the feeding element, a width of the connecting patch gradually decreasing in a direction toward the feeding element; and

a radiating patch, with one end thereof electronically connected with the connecting patch.

7. The integrated antenna as recited in claim 6 , wherein the two printed antennas are symmetrically arranged on the two surfaces of the substrate.

8. The integrated antenna as recited in claim 6 , wherein the feeding element is a conductive line.

9. The integrated antenna as recited in claim 6 , wherein the radiating patch has an inverted V-shape.

10. The integrated antenna as recited in claim 6 , wherein the radiating patch has at least two branches extending away from the connecting patch.

11. The integrated antenna as recited in claim 10 , wherein the at least two branches are symmetrically defined mainly in the radiating patch.

12. The integrated antenna as recited in claim 6 , wherein a right-angled cutout is defined next to the connecting patch beside the feeding element.

13. An antenna device for radiating and capturing radio frequency signals, comprising:

a substrate;

an antenna formed on a surface of said substrate, said antenna comprising a feeding element, at least one grounding portion beside and spaced from said feeding element, and a radiating portion, said radiating portion electrically connected with said feeding element and having at least two branches extending away from said feeding element; and

another antenna formed on another surface of said substrate opposite to said antenna.

14. The antenna device as recited in claim 13 , wherein said radiating portion is substantially in an inverted “V” shape.

15. The antenna device as recited in claim 13 , wherein said radiating portion comprises a connecting patch electrically connected with said feeding element, and a radiating patch electrically connected with said connecting patch and spaced away from said feeding element.

16. The antenna device as recited in claim 15 , wherein a width of said connecting patch decreases gradually in a direction toward said feeding element.

17. The antenna device as recited in claim 15 , wherein said at least two branches are symmetrically defined mainly in said radiating patch.

18. The antenna device as recited in claim 15 , wherein a right-angled cutout is defined next to said connecting patch beside said feeding element.