Eye-mountable devices and structures for eye-mountable devices

1. An eye-mountable device comprising:

a transparent polymer, wherein the transparent polymer defines a posterior side and an anterior side of the eye-mountable device, wherein the transparent polymer has a concave surface and a convex surface, and wherein the concave surface is configured to be removably mounted over a corneal surface and the convex surface is configured to be compatible with eyelid motion when the concave surface is so mounted; and

a structure embedded in the transparent polymer, wherein the structure comprises:

a substrate comprising a loop portion and a tab portion, wherein the loop portion has an outer circumference defined by an outer diameter and an inner circumference defined by an inner diameter, and wherein the tab portion extends from the inner circumference of the loop portion towards a center of the loop portion,

an antenna comprising a conductive loop, wherein the conductive loop is disposed on the loop portion of the substrate between the inner circumference and the outer circumference, and

a sensor disposed on the tab portion of the substrate, wherein the sensor is configured to detect an analyte.

2. The eye-mountable device of claim 1 , wherein the tab portion of the substrate has an outer edge corresponding to the outer circumference of the loop portion, an inner edge opposite the outer edge, and first and second side edges that extend inwardly from the inner circumference of the loop portion of the substrate to the inner edge of the tab portion of the substrate.

3. The eye-mountable device of claim 2 , wherein the first and second side edges of the tab portion of the substrate are substantially perpendicular to the inner circumference of the loop portion of the substrate.

4. The eye-mountable device of claim 2 , wherein the tab portion of the substrate has a width dimension between the inner edge and the outer edge, wherein the width dimension is between about 1 millimeter and about 2 millimeters.

5. The eye-mountable device of claim 1 , wherein the conductive loop has a diameter between 9.65 millimeters and 11.65 millimeters.

6. The eye-mountable device of claim 1 , wherein the conductive loop has a width dimension between 250 micrometers and 350 micrometers.

7. The eye-mountable device of claim 1 , wherein the conductive loop comprises a metal layer coated with a barrier layer.

8. The eye-mountable device of claim 7 , wherein the barrier layer extends from the metal layer a distance between 25 micrometers and 125 micrometers.

9. The eye-mountable device of claim 7 , wherein the barrier layer has a thickness less than 5 nanometers.

10. The eye-mountable device of claim 1 , wherein the structure further comprises one or more electronic components disposed on the tab portion of the substrate, wherein the one or more electronic components are configured to operate the sensor and the antenna.

11. The eye-mountable device of claim 10 , wherein the one or more electronic components include an integrated circuit and a capacitor, wherein the integrated circuit and capacitor are spaced apart a distance between 0.9 millimeters and 1.3 millimeters.

12. The eye-mountable device of claim 10 , wherein the structure further comprises a battery disposed on the tab portion of the substrate.

13. The eye-mountable device of claim 10 , wherein the one or more electronic components disposed on the tab portion are coated with a barrier layer.

14. The eye-mountable device of claim 1 , wherein the sensor is at least partially coated with a barrier layer.

15. The eye-mountable device of claim 1 , wherein the structure is substantially planar.

16. The eye-mountable device of claim 1 , wherein the transparent polymer has a curvature, and the structure at least partially conforms to the curvature of the transparent polymer.

17. The eye-mountable device of claim 1 , wherein the tab portion of the substrate has an outer edge corresponding to the outer circumference of the loop portion, and an inner edge that has a portion that is opposite the outer edge, wherein the inner edge has first and second ends that contact the inner circumference of the loop portion of the substrate.

18. The eye-mountable device of claim 17 , wherein the first end of the inner edge of the tab portion of the substrate has a first curvature, and wherein the second end of the inner edge of the tab portion of the substrate has a second curvature.

19. The eye-mountable device of claim 18 , wherein the first curvature is between about 1.9 millimeters and 2.9 millimeters.

20. A structure configured to be embedded in a transparent polymer, the structure comprising:

a substrate comprising a loop portion and a tab portion, wherein the loop portion has an outer circumference defined by an outer diameter and an inner circumference defined by an inner diameter, wherein the tab portion extends from the inner circumference of the loop portion towards a center of the loop portion, wherein the tab portion of the substrate comprises:

an outer edge corresponding to the outer circumference of the loop portion,

an inner edge opposite the outer edge, and

first and second side edges that extend inwardly from the inner circumference of the loop portion of the substrate to the inner edge of the tab portion of the substrate, wherein the first and second side edges of the tab portion of the substrate are substantially perpendicular to the inner circumference of the loop portion of the substrate;

an antenna comprising a conductive loop, wherein the conductive loop is disposed on the loop portion of the substrate between the inner circumference and the outer circumference; and

a sensor disposed on the tab portion of the substrate, wherein the sensor is configured to detect an analyte, wherein the transparent polymer defines a posterior side and an anterior side of an eye-mountable device, wherein the transparent polymer has a concave surface and a convex surface, and wherein the concave surface is configured to be removably mounted over a corneal surface and the convex surface is configured to be compatible with eyelid motion when the concave surface is so mounted.