Non-uniform spacing in wireless resonator coil

Patent metadata

Field	Value
Publication number	US-9640318-B2
Application number	US-201414318304-A
Country	US
Kind code	B2
Filing date	Jun 27, 2014
Priority date	Dec 7, 2013
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

Techniques of forming a transmitter coil are described herein. The techniques may include forming turns of the transmitter coil, wherein a non-uniform spacing between the turns of the transmitter coil is to reduce a magnetic field variation associated with the transmitter coil.

First claim

What is claimed is:

1. A coil to generate a magnetic field, comprising:
a turn of the coil to propagate an electric charge; and
at least one additional turn of the coil to propagate the electric charge, wherein the propagation of electric charge from one coil turn to another coil turn generates a magnetic field above the coil, and wherein the spacing between the coil turns is non-uniform and increases the uniformity of the magnetic field above the coil compared to a uniform spacing of the coil turns;
wherein the non-uniform spacing between the turns of the coil is based on variables, the variables comprising:
a predetermined minimum spacing between turns as well as a predetermined thickness of the coil; and
a predetermined maximum magnetic field variance to be emitted by the coil.

2. The coil of claim 1 , wherein the coil turns comprise:
a first coil turn having a length of about 140 millimeters and a width of about 90 millimeters; and
a second coil turn coupled to the first coil turn, the second having a length of about 132 millimeters and a width of about 82 millimeters.

3. The coil of claim 2 , wherein the coil turns comprise:
a third coil turn coupled to the second coil turn having a length of about 124 millimeters and a width of about 74 millimeters; and
a fourth coil turn coupled to the third coil turn, the fourth turn having a length of about 108 millimeters and a width of about 58 millimeters.

4. The coil of claim 3 , wherein the coil turns comprise:
a fifth coil turn coupled to the fourth coil turn, the fourth coil turn having a length of about 78 millimeters and a width of about 28 millimeters;
wherein the fifth coil turn is coupled to a via communicatively coupled to the first turn.

5. The coil of claim 1 , wherein the transmitter coil is formed in a printed circuit board (PCB) about 143.5 millimeters long and about 91 millimeters wide.

6. The coil of claim 5 , the PCB comprising more than one layer of coil, and wherein each layer is coupled at a via between the layers.

7. The coil of claim 6 , wherein the coil is formed in a printed circuit board (PCB) having more than one layer, further comprising:
a plurality of traces of the transmitter coil at a bottom later of the PCB electrically coupled to at least one additional turn of the coil; the plurality of traces comprising:
a first trace having a length of about 36.5 millimeters; and
a second trace having a length of about 45 millimeters.

8. The coil of claim 1 , wherein the variables comprise:
a length and width of the coil; and
a number of turns of the coil.

Assignees

• Intel Corp

Inventors

• Rosenfeld Jonathan
• Kasturi Sreenivas
• Yang Songnan
• Elkhouly Essam

Classifications

• H01F38/14 Primary

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• H01F41/041

  Printed circuit coils (apparatus or processes for manufacturing printed circuits in general H05K3/00) · CPC title

• H01F5/00

  Coils (superconducting coils H01F6/06; fixed inductances of the signal type H01F17/00) · CPC title

• H01F27/2804

  Printed windings · CPC title

• H01F27/006

  with special arrangement or spacing of turns of the winding(s), e.g. to produce desired self-resonance · CPC title