Wearable electronic device including an overlapping communications antenna
A wearable electronic device is described. The wearable electronic device includes two communications antennae. A first antenna of the two is a current-carrying antenna electrically and physically connected to a printed circuit board of the wearable electronic device and housed in a first portion of a housing that is configured for mounting on a person's skin. A second antenna of the two is a scatterer antenna physically connected to an interior surface of a second portion of the housing and configured to overlap a portion of the current-carrying antenna. The second portion of the housing faces away from the person's skin when the wearable device is mounted on the person's skin. Current from the current-carrying antenna is induced in the scatterer antenna to enable communications between the wearable electronic device and one or more other electronic devices.
1. A wearable device, comprising:
a first housing portion comprising a first communications antenna; and
a second housing portion configured to couple with the first housing portion to form at least part of a device housing, the second housing portion comprising a second communications antenna that comprises a first part and a second part, wherein the first part of the second communications antenna overlaps a portion of an electrical component of the device and the second part of the second communications antenna overlaps a portion of the first communications antenna.
2. The wearable device of claim 1 , wherein the second communications antenna comprises a half wave dipole antenna.
3. The wearable device of claim 1 , wherein the wearable device is a continuous glucose monitoring device.
4. The wearable device of claim 1 , wherein the first communications antenna is configured to electromagnetically couple with the second communications antenna to induce a current and create a radiating electromagnetic field.
5. The wearable device of claim 1 , wherein the first communications antenna comprises an open-loop current carrying antenna.
6. The wearable device of claim 1 , wherein the second communications antenna comprises a metallic trace formed in a dielectric substrate, and wherein the dielectric substrate is physically connected to the second housing portion, and wherein the dielectric substrate comprises a glass-reinforced epoxy laminate material or a flexible printed circuit board.
7. The wearable device of claim 1 , wherein the second communications antenna comprises a conductive ink that is deposited on the second housing portion.
8. The wearable device of claim 1 , wherein the first communications antenna is located in a first plane and the second communications antenna is located in a second plane that is different from the first plane and substantially parallel to the first plane.
9. The wearable device of claim 1 , wherein the first part of the second communications antenna comprises an arcuate profile and the second part of the second communications antenna comprises a straight profile.
10. A device, comprising:
a lid comprising a scatterer antenna physically connected thereto, the scatterer antenna comprising a first part and a second part; and
a bottom comprising a substrate that includes a current-carrying communications antenna, wherein the first part of the scatterer antenna overlaps a portion of the substrate that excludes the current-carrying communications antenna, and the second part of the scatterer antenna overlaps a portion of the current-carrying communications antenna to define an electromagnetic coupling region.
11. The device of claim 10 , wherein the current-carrying communications antenna is configured to electromagnetically couple with the scatterer antenna within the electromagnetic coupling region to induce an electrical current and create a radiating electromagnetic field.
12. The device of claim 10 , further comprising a near-field antenna physically connected to the substrate within a perimeter region of the substrate.
13. The device of claim 12 , wherein the current-carrying communications antenna is physically connected to the substrate closer to a center of the substrate than the near-field antenna.
14. The device of claim 10 , wherein the substrate comprises a printed circuit board.
15. The device of claim 10 , further comprising a battery physically connected to the substrate, and wherein the first part of the scatterer antenna overlaps a portion of the battery.
16. The device of claim 10 , wherein the scatterer antenna comprises a metallic trace that is formed in a dielectric substrate, wherein the metallic trace is disposed on a first side of the dielectric substrate, and wherein the first side of the dielectric substrate is in physical contact with an interior surface of the second housing portion.
17. The device of claim 16 , wherein the dielectric substrate comprises at least one of a glass-reinforced epoxy laminate material or a flexible printed circuit board.
18. A method, comprising:
providing a first housing portion of a device housing, the first housing portion comprising a substrate to which is physically connected a first communications antenna;
providing a second housing portion of the device housing, the second housing portion comprising a second communications antenna physically connected thereto;
aligning the first housing portion and the second housing portion such that a first part of the second communications antenna overlaps the first communications antenna and a second part of the second communications antenna overlaps a portion of the substrate that excludes the first communications antenna; and
physically connecting the second housing portion and the first housing portion.
19. The method of claim 18 , wherein the substrate further comprises a battery physically connected thereto, and wherein aligning the first housing portion and the second housing portion comprises aligning the second housing portion with the first housing portion such that the second part of the second communications antenna overlaps the battery.
20. The method of claim 18 , further comprising forming the second communications antenna.