# US 2004/0070482 A1 · Flat coil

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- Number: US 2004/0070482 A1
- Document ID: US20040070482A1
- Status: Published application
- Kind: A1
- Application number: 10/466,932
- Filed: 2003-07-22
- Published: 2004-04-15
- Earliest claimed: 2001-01-22
- Inventors: Gady Golan
- Web page: https://patentgrep.com/patent/US20040070482A1

## CPC

- H01F 41/046: {structurally combined with ferromagnetic material}
- H01F 17/0006: {Printed inductances (printed coils for dynamo-electric machines H02K3/26; printed circuits H05K)}
- H01F 17/0033: {with the coil helically wound around a magnetic core}
- H01F 17/04: with magnetic core
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A flat coil assembly (10) comprising at least one electrically conductive layer (12) arranged in a substantially uniplanar spiral arrangement of loops with a void in a center of the spiral, and a core (14) made from mu-metal, wherein the core extending on one side of the uniplanar spiral arrangement over at least a first portion of the loops from an external loop to an internal loop, crossing over, through the void in the center and extending over at least a second portion of the loops on the other side of the uniplanar spiral arrangement.

## Claims

### Claim 1

A flat coil assembly comprising at least one electrically conductive layer arranged in a substantially uniplanar spiral arrangement of loops with a void in a center of the spiral, and a core made from mu-metal.

### Claim 2

A flat coil assembly comprising at least one electrically conductive layer arranged in a substantially uniplanar spiral arrangement of loops with a void in a center of the spiral, and a core layer made from mu-metal extending on one side of the uniplanar spiral arrangement over at least a first portion of the loops from an external loop to an internal loop, crossing over, through the void in the center and extending over at least a second portion of the loops on the other side of the uniplanar spiral arrangement.

### Claim 3 (depends on 2)

The flat coil assembly of claim 2, wherein the first and second portions substantially overlap.

### Claim 4 (depends on 2)

The flat coil assembly of claim 2, wherein the first and second portions substantially do not overlap.

### Claim 5 (depends on 2)

The flat coil assembly of claim 2 wherein there are a first and second electrically conductive layers arranged each in a substantially uniplanar spiral arrangement of loops and electrically connected at internal ends of the spirals, and having a void in a center of each of the spirals, and a core layer made from mu-metal extending on one side of the first uniplanar spiral arrangement over at least a first portion of the loops from an external loop to an internal loop, crossing over, through the voids in the center and extending over at least a second portion of the loops on the other side of the second uniplanar spiral arrangement.

### Claim 6 (depends on 5)

The flat coil assembly of claim 5, wherein the electrically conductive layers are counteroriented.

### Claim 7 (depends on 5)

The Flat coil assembly of claim 5, wherein each electrically conductive layer is placed on either side of a dielectric layer.

### Claim 8 (depends on 2)

The flat coil assembly of claim 2, wherein the core layer and the electrically conductive layer are about 100 microns in thickness each.

### Claim 9 (depends on 2)

The flat coil assembly of claim 2, wherein the electrically conductive layer is made form copper.

### Claim 10 (depends on 2)

The flat coil assembly of claim 2, printed on a printed circuit board (PCB).

### Claim 11 (depends on 2)

The flat coil assembly of claim 2, wherein the layers are manufactured using thick film technology, such as electroplating, metal-organic chemical vapor deposition (CVD).

### Claim 12 (depends on 2)

The flat coil assembly of claim 2, wherein the layers are manufactured using thin film technology such as magnetron sputtering.

### Claim 13 (depends on 2)

The flat coil assembly of claim 2, wherein the layers are manufactured using cut foils of mu-metal.

### Claim 14 (depends on 2)

The flat coil assembly of claim 2, wherein the loops are rectangularly shaped.

### Claim 15 (depends on 2)

The flat coil assembly of claim 2, wherein the loops are flatly shaped.

### Claim 16

A flat coil assembly substantially as described in the above specification and accompanying figures.