Coupled multi-bands antennas in wearable wireless devices
A wearable wireless device is disclosed. In one embodiment the wearable wireless device includes a circuit board, a housing body housing the circuit board, the housing body having a front side and a back side, the back side configured to be closer to the user when worn than the front side, a first antenna element electrically connected to the circuit board and located at the front side of the housing body and a second antenna element electrically connected to the circuit board and located at the front side of the housing body.
1. A wearable wireless device comprising:
a circuit board;
a housing body housing the circuit board, the housing body having a front side and a back side, the back side configured to be closer to a user when worn than the front side;
a display located at the front side of the housing body;
a first antenna element electrically connected to the circuit board and located at the front side of the housing body; and
a second antenna element electrically connected to the circuit board and located at the front side of the housing body,
wherein a first end of the first antenna element and a first end of the second antenna element are separated by a first distance, and wherein a second end of the first antenna element and a second end of the second antenna element are separated by a second distance.
2. The wearable wireless device according to claim 1 , further comprising a battery located at the back side of the housing body.
3. The wearable wireless device according to claim 1 , wherein the front side comprises a top surface and wherein the first and second antenna elements are located at the top surface along top surface edges.
4. The wearable wireless device according to claim 1 , wherein the front side comprises a top surface and the back side comprises a bottom surface, wherein side surfaces connect the top surface and the bottom surface, and wherein the first and second antenna elements are located at the top surface and the side surfaces.
5. The wearable wireless device according to claim 1 , wherein the front side comprises a top surface and the back side comprises a bottom surface, wherein tilted surfaces connect side surfaces to the top surface, and wherein the first and second antenna elements are located at the tilted surfaces.
6. The wearable wireless device according to claim 1 , wherein the front side comprises a demi bull nose structure, wherein the first and second antenna elements are located at the demi bull nose structure.
7. The wearable wireless device according to claim 1 , wherein the first and second antenna elements are embedded in the housing body.
8. The wearable wireless device according to claim 1 , wherein the first and second antenna elements are coated with a protection layer.
9. The wearable wireless device according to claim 1 , wherein the first distance is smaller than the second distance.
10. The wearable wireless device according to claim 9 , wherein feed points of the first and second antenna elements to the circuit board are located near the first distance and away from the second distance.
11. The wearable wireless device according to claim 1 , wherein the first antenna element is part of a first multiband antenna, and wherein the second antenna element is part of a second multiband antenna.
12. The wearable wireless device according to claim 11 , wherein the first multiband antenna is a multiband cellular antenna, and wherein the second multiband antenna is a GPS/WiFi/Bluetooth antenna.
13. The wearable wireless device according to claim 1 , wherein the first antenna element is electrically connected to a first feed point, wherein the second antenna element is electrically connected to a second feed point, and wherein the first feed point and the second feed point are located at the same edge of the circuit board.
14. The wearable wireless device according to claim 1 , wherein the first antenna element is shorter than the second antenna element.
15. The wearable wireless device according to claim 1 , wherein the first and second antenna elements bend around one or more corners of the housing body.
16. The wearable wireless device according to claim 1 , wherein the first and second antenna elements have a shared ground plate.
17. The wearable wireless device according to claim 16 , wherein the first and second antenna elements with the shared ground plate form a dipole or monopole.
18. The wearable wireless device according to claim 1 , wherein a length of the first antenna element is about 55 mm to about 90 mm, wherein a length of the second antenna element is about 40 mm to about 65 mm, and wherein a relative permittivity of a material of the housing body is about 2.5 to about 4.4.
19. The wearable wireless device according to claim 18 , wherein the length of the first antenna element is about 84 mm, wherein the length of the second antenna element is about 61 mm, and wherein the relative permittivity of the housing body is about 2.5.
20. A wearable wireless device comprising:
a first antenna comprising a first antenna element and a shared ground plate;
a second antenna comprising a second antenna element and the shared ground plate;
a housing body housing the first and second antenna elements at a front side, the front side configured to face away from a user and a back side, opposite to the front side, the back side configured to face the user; and
a display located at the front side of the housing body,
wherein a first end of the first antenna element and a first end of the second antenna element are separated by a first distance, and wherein a second end of the first antenna element and a second end of the second antenna element are separated by a second distance.
21. The wearable wireless device according to claim 20 wherein the first and second antenna elements are bent around the display at an outer surface of the housing body.
22. The wearable wireless device according to claim 20 , wherein the first and second antenna elements are embedded in the housing body or are coated with a coating layer.
23. A watch comprising:
a circuit board;
a housing body having a front side and a back side, the back side configured to be closer to a user than the front side when worn by the user;
a first antenna element electrically connected to the circuit board and located at the front side of the housing body; and
a second antenna element electrically connected to the circuit board and located at the front side of the housing body, and
wherein the circuit board is housed in the housing body of the watch.
24. The watch according to claim 23 , wherein a first end of the first antenna element and a first end of the second antenna element are separated by a first distance, wherein a second end of the first antenna element and a second end of the second antenna element are separated by a second distance.
25. The watch according to claim 24 , wherein the first and the second distances are between 10 mm and 50 mm.
26. The watch according to claim 23 , wherein first antenna element is part of a multiband cellular antenna, wherein the second antenna element is part of a GPS/WiFi/Bluetooth antenna, and wherein the first and second antenna elements comprise overlapping bands.