HIGH FREQUENCY PCB COILS

• US 20130069753A1
• Filed: 09/17/2012
• Published: 03/21/2013
• Est. Priority Date: 09/16/2011
• Status: Abandoned Application

• Current Assignee: WiTricity Corporation
• Original Assignee: WiTricity Corporation
• Inventors: Kurs, Andre B., Kesler, Morris P., Hall, Katherine L., Campanella, Andrew J.
• Application Number:
  US13/621,503
• Publication Number:
  US 20130069753A1
• Time in Patent Office: Days
• US Class Current: 336/200
• CPC Class Codes: H01F 5/003 Printed circuit coils

Abstract

Described herein designs for high frequency printed circuit board (PCB) resonator coils. The resonator coils are printed or etched on a thin substrate. The number of loops of the resonator coil, the width of each trace, the spacing between the traces, and the like are adjusted to increase the quality factor Q of the resonator coils.

Claims

1. A printed resonator coil comprising:

an electrically insulating substrate; and

an electrically conducting trace attached to the substrate;

wherein the electrically conducting trace is shaped to spiral inwards making at least two loops and wherein the conducting trace spirals inwards a substantially equal percentage of a distance of each of two dimensions of the resonator coil.

2. The resonator coil of claim 1, wherein the resonator coil spirals at least 15% of the distance in each of the two dimensions.

3. The resonator coil of claim 1, wherein the resonator coil spirals at least 25% of the distance in each of the two dimensions.

4. The resonator coil of claim 1, wherein the resonator coil has at least one rounded corner.

5. The resonator coil of claim 4, wherein the shape of the resonator coil follows a smooth parametric curve shapes.

6. The resonator coil of claim 1, wherein the conducting trace is spaced at least 1 mm as it spirals inwards.

7. The resonator coil of claim 1, wherein the conducting trace is spaced to reduce the electric field between adjacent portions of the conducting trace.

8. The resonator coil of claim 1, further comprising one or more additional electrically conducting traces.

9. The resonator coil of claim 8, wherein the one or more additional electrically conducting traces are separated by an insulating layer.

10. The resonator coil of claim 9, wherein the one or more additional electrically conducting traces are positioned to minimize overlap with the electrically conducting trace.