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1. (WO2013155015) ANTENNA SURROUNDED BY METAL HOUSING
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CLAIMS

1 . An electronic device comprising an antenna system including:

a metal housing wall including a slot;

an coupling structure located proximate said metal housing wall and coupled to said metal housing wall proximate said slot.

2. The electronic device according to claim 1 wherein:

said metal housing wall includes a corner, a first edge and a second edge that meet at said corner and wherein said slot extends from an open end disposed at said first edge proximate to and parallel to said second edge to a closed end, wherein a metal strip portion of said metal housing wall bounded on three sides by said slot, said second edge and said first edge is defined; and said coupling structure is located proximate said metal strip portion, wherein said coupling structure is coupled to said metal strip portion.

3. The electronic device according to claim 2 wherein said coupling structure includes at least one part that is spaced from said metal strip portion by less than 0.5 millimeters whereby capacitive coupling of said coupling structure to said metal strip portion is enhanced.

4. The electronic device according to claim 2 further comprising a discrete capacitor coupled between said coupling structure and said metal strip portion.

5. The electronic device according to claim 2 wherein said coupling structure includes a current loop path.

6. The electronic device according to claim 5 wherein said current loop path includes a least a portion that runs proximate said metal strip portion.

7. The electronic device according to claim 5 wherein said coupling structure includes a depending tab that extends proximate said metal strip portion whereby capacitive coupling of said coupling structure to said metal strip portion through said depending tab is enhanced.

8. The electronic device according to claim 5 wherein said current loop path includes at least one discrete series capacitor.

9. The electronic device according to claim 5 including a signal feed line including a ground conductor and a signal conductor wherein at least one of said ground conductor and said signal conductor is coupled to said coupling structure through a first discrete impedance device, whereby an impedance of said signal feed line is matched to an impedance of said antenna.

10. The electronic device according to claim 9 wherein said signal conductor is coupled to said coupling structure through said first discrete impedance device and said ground conductor is coupled to said coupling structure through a second discrete impedance device.

1 1 . The electronic device according to claim 2 further comprising a parasitic element that is disposed proximate to said coupling structure.

12. The electronic device according 1 1 to claim wherein said parasitic element includes a grounding tab that is positioned in spaced relation from said slot between said open end of said slot and said closed end of said slot.

13. The electronic device according to claim 12 wherein said coupling structure and said parasitic element extend parallel to said strip and wherein said parasitic element establishes a frequency band of operation of said antenna system that corresponds to an electrical length that is shorter than an electrical length of said strip.

14. The electronic device according to claim 1 wherein said antenna system comprises a coupling structure coupled to said metal housing proximate said slot wherein said coupling structure includes a current loop path.

15. The electronic device according to claim 14 wherein said current loop path includes a least a portion that runs proximate said metal housing wall.

16. The electronic device according to claim 14 wherein said coupling structure includes at least one part that is spaced from said metal housing by less than 1 .0 millimeters whereby capacitive coupling of said coupling structure to said metal housing is enhanced.

17. The electronic device according to claim 2 wherein said coupling structure is coupled to said metal strip proximate said first edge.

18. The electronic device according to claim 17 wherein said coupling structure is galvanically coupled to said metal strip.

19. The electronic device according to claim 17 wherein said coupling structure is capacitively coupled to said metal strip.

20. The electronic device according to claim 2 wherein said coupling structure extends parallel to said metal strip from a signal coupling portion to a point proximate said first edge.

21 . The electronic device according to claim 20 wherein said coupling structure includes a backwardly extending strip that extends in a direction away from said first edge from a point intermediate along the length of said coupling structure

22. The electronic device according to claim 2 further comprising a parasitic element positioned proximate and parallel to said coupling structure and proximate and parallel to said metal strip

23. The electronic device according to claim 22 wherein said parasitic element is grounded by a conductor that crosses over said slot.

24. A wireless communication device comprising:

an antenna system including:

a metal part including: a first edge and a second edge that meet at a corner, a slot formed in said metal part extending from said first edge, proximate to said second edge thereby defining a strip bounded on three sides by said slot, said first edge and said second edge;

a coupling structure coupled to said strip;

a parasitic element disposed proximate said coupling structure substantially overlying said strip in spaced relation to said strip;

a grounding conductor extending from said parasitic element across said slot and galvanically coupled to a portion of said metal part located across said slot from said strip.

25. The wireless communication device according to claim 24 wherein said slot is parallel to said second edge and said parasitic element is oriented parallel to said strip.

26. The wireless communication device according to claim 25 wherein said strip is dimensioned to support a first fundamental resonance centered at a first frequency;

said parasitic element grounded by said grounding conductor establishes two additional resonances of said antenna system that are associated with portions of said strip on either side of a location where said grounding conductor is connected to said metal part; and

wherein said wireless communication device further comprises:

a transceiver coupled to said antenna system, wherein said transceiver operates at a first frequency that is within a first frequency band established by said first fundamental resonance and said transceiver operates at a second frequency that is within a second frequency band established by at least one of said additional resonances.