ANTENNA FOR NEAR FIELD WIRELESS POWER CHARGING

• US 20170187222A1
• Filed: 02/17/2016
• Published: 06/29/2017
• Est. Priority Date: 12/24/2015
• Status: Active Grant

• Current Assignee: Energous Corporation
• Original Assignee: Energous Corporation
• Inventors: LEABMAN, Michael A., HOSSEINI, Alister
• Granted Patent: US 10,256,657 B2
• Time in Patent Office: Days
• CPC Class Codes: H02J 50/05 using capacitive coupling
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction

Abstract

A wireless charging system comprises a first coaxial structure configured to have an RF signal present on a conductor; and a second coaxial structure configured to have an RF signal present, power being transferred from the first coaxial structure to the second coaxial structure when the first coaxial structure and the second coaxial structure are excited in proximity to each other.

Claims

1. A wireless charging system comprising:

a first coaxial structure configured to carry an RF signal present on a conductor; and

a second coaxial structure configured to be excited by an RF signal from the first coaxial structure, power being transferred from the first coaxial structure to the second coaxial structure when the first coaxial structure and the second coaxial structure are placed in proximity to each other.

2. The apparatus according to claim 1, wherein the first coaxial structure is situated in a charging device and the second coaxial structure is situated in an electronic device, the power being transferred in response to a surface of the electronic device being touched to a surface of the charging device.

3. The apparatus according to claim 1, wherein the proximity of first and second coaxial structures is less than about 10 mm.

4. The apparatus according to claim 1, wherein the first and second coaxial structures include respective planar surfaces configured to be positioned in proximity to each other.

5. The apparatus according to claim 4, wherein the planar surfaces are positioned in proximity to each other and in parallel with one another.

6. The apparatus according to claim 1, wherein the first coaxial structure comprises a substrate, and wherein the substrate comprises a metamaterial.

7. The apparatus according to claim 6, where a metallic core is formed at a center location of the substrate.

8. The apparatus according to claim 1, wherein the second coaxial structure comprises a substrate, and wherein the substrate comprises a metamaterial.

9. The apparatus according to claim 8, where a metallic core is formed at a center location of the substrate.

10. The apparatus according to claim 2, further comprising a magnet attached to each of the charging device and the electronic device so as to cause the electronic device and the charging device to be pulled towards each other to at least a proximate distance that causes excitation.

11. The apparatus according to claim 2, wherein the electronic device is a wearable watch.

12. A method for charging an electronic device in a wireless charging system, the method comprising:

upon a first planar coaxial structure being proximately positioned to a second planar coaxial structure, exciting the first planar coaxial structure to allow for the transfer power from the first planar coaxial structure to the second planar coaxial structure.

13. The method according to claim 12, wherein the first coaxial structure is situated in a charging device and the second coaxial structure is situated in an electronic device, wherein power is transferred in response to a surface of the electronic device being proximately positioned to a surface of the charging device to charge a battery of the electronic device.

14. The method according to claim 12, wherein the first planar coaxial structure is positioned in proximity to the second planar coaxial structure and in parallel to the second planar coaxial structure.

15. The method according to claim 12, wherein the proximity of first and second planar coaxial structures is less than about 10 mm.

16. The method according to claim 12, wherein the first coaxial structure comprises a a substrate, and wherein the substrate comprises a metamaterial.

17. The method according to claim 12, wherein the second coaxial structure comprises a substrate, and wherein the substrate comprises a metamaterial.

18. The method according to claim 17, further comprising forming, a metallic core at a center location of the substrate.

19. The method according to claim 13, further comprising attaching, a magnet to each of the charging device and the electronic device so as to cause the electronic device and the charging device to be pulled towards each other to a proximate distance that results in a coaxial field radiation.

20. The method according to claim 13, wherein the electronic device is a wearable watch.

21. A wireless charging system comprising:

a second coaxial structure configured to be excited by an RF signal, wherein power is transferred from a first coaxial structure having an RF signal present to the second coaxial structure when the first coaxial structure and the second coaxial structure are placed in proximity to each other.

22. A wireless charging system comprising:

a first coaxial structure carrying an RF signal, wherein power is transferred from the first coaxial structure to a second coaxial structure when the first coaxial structure and the second coaxial structure are excited in proximity to each other.