Mobile device antenna

1. An antenna system for a mobile device, the antenna system comprising:

a plurality of feeds on a substantially planar surface of a substrate, each of the plurality of feeds having a first end that is connected to at least one of the other feeds and a second end that is connected to a same connector, wherein the plurality of the feeds include a first feed and a second feed;

a parasitic on the substantially planar surface, wherein the parasitic is a conductor having a first section capacitively coupled to the first feed; and

a main antenna structure extending from the substantially planar surface and connected to the connector.

2. The antenna system of claim 1 , wherein the main antenna structure abuts a carrier structure on the substantially planar surface.

3. The antenna system of claim 2 , wherein the main antenna structure includes a conductive strip extending along a tortuous path about the carrier structure.

4. The antenna system of claim 3 , wherein the tortuous path includes multiple sections and substantially right angles between adjacent sections.

5. The antenna system of claim 4 , wherein at least two of the sections are capacitively coupled to a ground.

6. The antenna system of claim 4 , wherein the main antenna structure includes a branching structure extending between two of the sections.

7. The antenna system of claim 1 , wherein the substantially planar surface defines a length direction and a width direction, and the main antenna structure extends from the substantially planar surface in a height direction.

8. The antenna system of claim 1 , wherein the first feed includes a substantially planar structure having a width that is tapered along a length of the planar structure.

9. The antenna system of claim 1 , wherein the first feed includes a substantially planar structure having a width that is stepped along a length of the planar structure.

10. The antenna system of claim 9 , wherein the first section of the parasitic has a stepped structure geometrically matching the stepped structure of the first feed.

11. The antenna system of claim 1 , wherein the plurality of feeds include a plurality of substantially planar structures, and each of the substantially planar structures has a different length than the other substantially planar structures.

12. The antenna system of claim 1 , wherein the plurality of feeds, the connector, and the main antenna structure define a three-dimensional volume of the antenna system, a largest dimension of the three-dimensional volume is less than or equal to 27 millimeters, and a smallest dimension of the three-dimensional volume is less than or equal to 4 millimeters.

13. The antenna system of claim 1 , wherein the plurality of feeds include a third feed.

14. A mobile device comprising an antenna comprising:

a plurality of feeds on a substantially planar surface of a substrate, each of the plurality of feeds having a first end that is connected to at least one of the other feeds and a second end that is connected to a same connector, wherein the plurality of the feeds include a first feed and a second feed;

a parasitic on the substantially planar surface, wherein the parasitic is a conductor having a first section capacitively coupled to the first feed; and

a main antenna structure extending from the substantially planar surface and connected to the connector.

15. The mobile device of claim 14 , further comprising a wired port structure of the mobile device, wherein the connector is connected to a ground of the wired port structure.

16. The mobile device of claim 15 , wherein the wired port structure comprises a Universal Serial Bus (USB) port.

17. The mobile device of claim 14 , wherein the antenna is operable to communicate signals ranging from 824 MHz to 960 MHz.

18. The mobile device of claim 14 , further comprising a transceiver connected to at least one of the feeds.

19. The mobile device of claim 14 , wherein the main antenna structure abuts a carrier structure on the substrate, and the main antenna structure includes a conductive strip about the carrier structure.

20. The mobile device of claim 19 , wherein a path defined by the conductive strip includes multiple sections, and at least two of the sections are capacitively coupled to a ground.

21. The mobile device of claim 19 , wherein a path defined by conductive strip includes multiple sections, and the main antenna structure includes a branching structure extending between two of the sections.

22. The mobile device of claim 14 , wherein the first feed includes a substantially planar structure having a width that is tapered along a length of the planar structure.

23. The mobile device of claim 14 , wherein the first feed includes a substantially planar structure having a width that is stepped along a length of the planar structure.

24. The mobile device of claim 14 , wherein the plurality of feeds include a third feed.

25. A method of operating a mobile device comprising:

wirelessly communicating information by an antenna of the mobile device comprising:

a plurality of feeds on a substantially planar surface of a substrate, each of the plurality of feeds having a first end that is connected to at least one of the other feeds and a second end that is connected to a same connector, wherein the plurality of the feeds include a first feed and a second feed;

a parasitic on the substantially planar surface, wherein the parasitic is a conductor having a first section capacitively coupled to the first feed; and

a main antenna structure extending from the substantially planar surface and connected to the connector; and

transferring the information between the antenna and data processing apparatus of the mobile device.

26. The method of claim 25 , wherein wirelessly communicating comprises transmitting wireless signals having a frequency in a range from 824 MHz to 960 MHz.

27. The method of claim 25 , wherein wirelessly communicating comprises receiving wireless signals having a frequency in a range from 824 MHz to 960 MHz.