Wireless electronic devices with multiple curved antennas along an end portion, and related antenna systems

1. A wireless electronic device, comprising:

a backplate;

first and second curved antennas spaced apart from each other along an end portion of the backplate, each of the first and second curved antennas comprising a radiating element and a parasitic element electrically coupled to the radiating element; and

a printed wiring board spaced apart from the first and second curved antennas.

2. The wireless electronic device of claim 1 , wherein each parasitic element comprises a respective partial metal ring that extends adjacent a perimeter of the backplate from the end portion of the backplate to a respective side portion of the backplate.

3. The wireless electronic device of claim 2 , further comprising a multi-band transceiver circuit coupled to the first and second curved antennas and configured to provide communications for the wireless electronic device via a plurality of frequency bands, wherein a distance between each partial metal ring and the multi-band transceiver circuit is greater than a distance between each radiating element and the multi-band transceiver circuit.

4. The wireless electronic device of claim 3 , wherein each partial metal ring is on a respective dielectric frame that is between the partial metal ring and the backplate.

5. The wireless electronic device of claim 4 , wherein each dielectric frame comprises at least one of plastic, glass, and ceramic materials.

6. The wireless electronic device of claim 2 , wherein each of the first and second curved antennas extends along a majority of the respective side portion of the backplate.

7. The wireless electronic device of claim 2 , wherein each of the first and second curved antennas is grounded adjacent the respective side portion of the backplate.

8. The wireless electronic device of claim 1 , wherein the first and second curved antennas are spaced apart from each other along the end portion of the backplate to provide a gap between the first and second curved antennas of about 8.0 millimeters.

9. The wireless electronic device of claim 8 , further comprising a connector in the gap that is configured to provide at least one of power, audio, video, and Universal Serial Bus (USB) connections.

10. The wireless electronic device of claim 1 , further comprising a third antenna on another end portion of the backplate.

11. The wireless electronic device of claim 10 , wherein the third antenna comprises at least one of a curved antenna, a cellular antenna, a non-cellular antenna, a diversity antenna, and a C-fed monopole metal antenna.

12. The wireless electronic device of claim 11 , further comprising a gap that separates the third antenna from the backplate and the first and second curved antennas.

13. The wireless electronic device of claim 12 , wherein:

the third antenna comprises a cellular antenna; and

the first and second curved antennas comprise a non-cellular antenna and a cellular antenna, respectively.

14. The wireless electronic device of claim 11 , wherein:

the third antenna comprises a non-cellular antenna; and

the first and second curved antennas comprise respective cellular antennas.

15. The wireless electronic device of claim 11 , wherein the first, second, and third antennas comprise respective partial metal ring antennas.

16. The wireless electronic device of claim 11 , wherein the backplate comprises a metal backplate.

17. A wireless electronic device, comprising:

a printed wiring board;

a backplate;

a multi-band transceiver circuit on the printed wiring board and configured to provide communications for the wireless electronic device via a plurality of frequency bands; and

first and second curved antennas spaced apart from each other along an end portion of the backplate, each of the first and second curved antennas comprising a radiating element and a parasitic element electrically coupled to the radiating element, wherein the multi-band transceiver circuit is configured to communicate through the first and second curved antennas via the plurality of frequency bands, wherein each parasitic element comprises a respective partial metal ring that extends from the end portion of the backplate to a respective side portion of the backplate, wherein each of the first and second curved antennas extends along a majority of the respective side portion of the backplate, and wherein the printed wiring board is spaced apart from the first and second curved antennas.

18. The wireless electronic device of claim 17 ,

wherein each of the first and second curved antennas is grounded adjacent the respective side portion of the backplate,

wherein the backplate comprises an external face that is touchable by a user of the wireless electronic device, and

wherein the first and second curved antennas define respective external edges of the wireless electronic device that are touchable by the user.

19. A multi-band antenna system, comprising:

a backplate comprising a perimeter that includes first and second end portions and first and second side portions;

first and second metal curved antennas spaced apart from each other along the first end portion of the backplate, each of the first and second metal curved antennas comprising respective first and second radiating elements electrically coupled to respective first and second metal curved parasitic elements, wherein each of the first and second metal curved parasitic elements extends continuously adjacent the perimeter from the end portion of the backplate along a respective one of the first and second side portions of the backplate; and

a printed wiring board spaced apart from the first and second metal curved antennas.

20. The multi-band antenna system of claim 19 , further comprising a third antenna on the second end portion of the backplate, wherein:

the first and second metal curved antennas are grounded adjacent the respective first and second side portions of the backplate;

the third antenna comprises a monopole antenna;

the first and second curved antennas comprise a non-cellular antenna and a cellular antenna, respectively; and

the first and second metal curved parasitic elements extend continuously adjacent the perimeter from the end portion of the backplate along a majority of the first and second side portions of the backplate, respectively.