Apparatus and system for transmitting power wirelessly

• US 7,843,288 B2
• Filed: 04/30/2008
• Issued: 11/30/2010
• Est. Priority Date: 11/15/2007
• Status: Active Grant

• Current Assignee: Postech Academy-Industry Foundation, Samsung Electronics Co. Ltd.
• Original Assignee: Postech Academy-Industry Foundation, Samsung Electronics Co. Ltd.
• Inventors: Woo, Dae-woong, Park, Wee-sang, Kim, Jae-hee, Muhn, Sung-jin, Lee, Dong-hyun, Park, Kyung-ho
• Primary Examiner(s): LEE, BENNY T
• Application Number:
  US12/112,287
• Publication Number:
  US 20090128262A1
• Time in Patent Office: 944 Days
• Field of Search: 333/219.1, 333/230, 333/202, 343/700.MS
• US Class Current: 333/219.1
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H01Q 9/0485 Dielectric resonator antennas

Abstract

An apparatus for transmitting power wirelessly is provided. The apparatus comprises: a dielectric resonator which generates evanescent waves in a predetermined direction in order to transmit power; and a loop antenna which is coupled to a surface of the dielectric resonator and supplies power to the dielectric resonator. The dielectric resonator transmits power by means of evanescent waves generated in directions perpendicular to top and bottom surfaces of the dielectric resonator and by radiation in directions parallel to the top and bottom surfaces of the dielectric resonator. Accordingly, efficient power transmission over short and long distance ranges is possible.

Claims

1. An apparatus for transmitting power wirelessly, the apparatus comprising:

a dielectric resonator which generates evanescent waves in directions perpendicular to a top surface and a bottom surface of the dielectric resonator in order to transmit power; and

a loop antenna which is coupled to one of the top and the bottom surfaces of the dielectric resonator and supplies power to the dielectric resonator.

2. The apparatus of claim 1, wherein the dielectric resonator has either a cylinder shape, a cylinder shape with a hole in the center, or a rectangular parallelepiped shape.

3. The apparatus of claim 1, wherein the loop antenna is separated by a predetermined space from one of the top and the bottom surfaces of the dielectric resonator and, when power is applied to the loop antenna, an electromagnetic field is excited in the dielectric resonator to provide power to the dielectric resonator.

4. An apparatus for transmitting power wirelessly, the apparatus comprising:

a dielectric resonator which generates evanescent waves in predetermined direction in order to transmit power, wherein the dielectric resonator transmits relatively more power to a power receiving apparatus using evanescent waves than radiation when the dielectric resonator is within a predetermined range of distance from the power receiving apparatus and transmits relatively more power by radiation than by evanescent waves when a distance of the dielectric resonator from the power receiving apparatus exceeds the predetermined range; and

a loop antenna which is coupled to a surface of the dielectric resonator and supplies power to the dielectric resonator.

5. A system for transmitting and receiving power wirelessly, the system comprising:

a power transmitting apparatus which includes a dielectric resonator and a loop antenna and transmits power provided from the loop antenna to a power receiving apparatus using evanescent waves generated by the dielectric resonator; and

the power receiving apparatus which includes another dielectric resonator that receives the power using the evanescent waves generated by the power transmitting apparatus and another loop antenna that transmits the received power to an external device,

wherein each of the power transmitting apparatus and the power receiving apparatus are formed by the respective dielectric resonator and the corresponding loop antenna which are coupled to each other, each of the power transmitting apparatus and the power receiving apparatus transmits and receives relatively more power using evanescent waves than radiation when each of the dielectric resonator is within a predetermined range of distance from each of the power transmitting apparatus and the power receiving apparatus, and transmits and receives relatively more power by radiation than by evanescent waves when a distance of each of the dielectric resonator from each of the power transmitting apparatus and the power receiving apparatus exceeds the predetermined range.

6. An apparatus for transmitting power wirelessly, the apparatus comprising:

a dielectric resonator which generates evanescent waves in predetermined direction in order to transmit power, wherein the dielectric resonator has a dielectric around which a coil is wound; and

a loop antenna which is coupled to a surface of the dielectric resonator and supplies power to the dielectric resonator.

7. A system for transmitting and receiving power wirelessly, the system comprising:

a power transmitting apparatus which includes a dielectric resonator and a loop antenna and transmits power provided from the loop antenna to a power receiving apparatus using evanescent waves generated by the dielectric resonator; and

the power receiving apparatus which includes another dielectric resonator that receives the power using the evanescent waves generated by the power transmitting apparatus and another loop antenna that transmits the received power to an external device,

wherein each of the power transmitting apparatus and the power receiving apparatus are formed by the respective dielectric resonator and the corresponding loop antenna which are coupled to each other, and the power transmitting apparatus and the power receiving apparatus respectively transmit and receive power by radiation in directions parallel to top and bottom surfaces of each dielectric resonator.

8. An apparatus for transmitting power wirelessly, the apparatus comprising:

a dielectric resonator which generates evanescent waves in predetermined direction in order to transmit power; and

a loop antenna which is coupled to a surface of the dielectric resonator and supplies power to the dielectric resonator, wherein the loop antenna is formed by patterning a loop-shaped antenna on a substrate.

9. The apparatus of claim 8, wherein a surface of the substrate on which the loop antenna is patterned is coupled to the surface of the dielectric resonator while an insulating layer is interposed between the surface of the substrate with the loop antenna pattern and the surface of the dielectric resonator.

10. The apparatus of claim 8, wherein a surface of the substrate opposite to the surface on which the loop antenna is patterned contacts the surface of the dielectric resonator to form the coupling.

11. An apparatus for receiving power wirelessly, the apparatus comprising:

a dielectric resonator which receives evanescent waves generated in a direction perpendicular to a top surface and a bottom surface of the dielectric resonator in order to receive power; and

a loop antenna which is coupled to one of the top and bottom surfaces of the dielectric resonator and receives power from the dielectric resonator.

12. A system for transmitting and receiving power wirelessly, the system comprising:

a power transmitting apparatus which includes a dielectric resonator and a loop antenna and transmits power provided from the loop antenna to a power receiving apparatus using evanescent waves generated by the dielectric resonator; and

the power receiving apparatus which includes another dielectric resonator that receives the power using the evanescent waves generated by the power transmitting apparatus and another loop antenna that transmits the received power to an external device,

wherein each of the power transmitting apparatus and the power receiving apparatus are formed by the respective dielectric resonator and the corresponding loop antenna which are coupled to each other, and each dielectric resonator of the power transmitting apparatus and the power receiving apparatus respectively transmits and receives power using evanescent waves generated in directions perpendicular to top and bottom surfaces of each dielectric resonator.

13. An apparatus for transmitting power wirelessly, the apparatus comprising:

a dielectric resonator which performs power transmission by radiation in directions parallel to top and bottom surfaces of the dielectric resonator; and

a loop antenna which is coupled to one of the top and the bottom surfaces of the dielectric resonator and supplies power to the dielectric resonator.

14. The apparatus of claim 13, wherein the dielectric resonator has at least one of a cylinder shape, a cylinder shape with a hole in the center, or a rectangular parallelepiped shape.

15. The apparatus of claim 13, wherein the loop antenna is separated by a predetermined space from a surface of the dielectric resonator and, when power is applied to the loop antenna, an electromagnetic field is excited in the dielectric resonator to provide power to the dielectric resonator.

16. A system for transmitting and receiving power wirelessly, the system comprising:

a power transmitting apparatus which includes a dielectric resonator and a loop antenna and transmits power provided from the loop antenna to a power receiving apparatus using evanescent waves generated by the dielectric resonator; and

the power receiving apparatus which includes another dielectric resonator that receives the power using the evanescent waves generated by the power transmitting apparatus and another loop antenna that transmits the received power to an external device,

wherein each of the power transmitting apparatus and the power receiving apparatus are formed by the respective dielectric resonator and the corresponding loop antenna which are coupled to each other, and the power transmitting and receiving efficiency increases as resonant frequencies of each dielectric resonator of the power transmitting apparatus and the power receiving apparatus become closer to each other.

17. An apparatus for receiving power wirelessly, the apparatus comprising:

a dielectric resonator which receives evanescent waves generated in a predetermined direction in order to receive power; and

a loop antenna which is coupled to a surface of the dielectric resonator and receives power from the dielectric resonator,

wherein the dielectric resonator includes a dielectric and a coil that is wound around the dielectric in order to reduce a dynamic frequency.