# US 2015/0102884 A1 · Common mode filter

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- Number: US 2015/0102884 A1
- Document ID: US20150102884A1
- Status: Published application
- Kind: A1
- Application number: 14/090,806
- Filed: 2013-11-26
- Published: 2015-04-16
- Earliest claimed: 2013-10-15
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Ju-Hwan Yang; Sang-Moon Lee; Jeong-Min Cho; Young-Do Kweon; Won-Chul Sim
- Web page: https://patentgrep.com/patent/US20150102884A1

## CPC

- H03H 7/427: {Common-mode filters (H02J3/01 and H02M1/126 takes precedence)}
- H01F 17/0006: {Printed inductances (printed coils for dynamo-electric machines H02K3/26; printed circuits H05K)}
- H01F 2017/0066: {with a magnetic layer}
- H03H 2001/0092: {Inductor filters, i.e. inductors whose parasitic capacitance is of relevance to consider it as filter}
- H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A common mode filter is disclosed. The common mode filter in accordance with an embodiment of the present invention includes: a magnetic substrate; a dielectric layer laminated on the magnetic substrate; an external electrode formed on the dielectric layer in such a way that one surface thereof is exposed to an outside; a conductive pattern formed on a surface of the dielectric layer so as to be located on a same plane as the external electrode and having one end thereof connected with the external electrode; an insulator film formed on a surface of the conductive pattern; and a magnetic layer formed on the insulator film so as to cover an upper surface and a lateral surface of the conductive pattern.

## Claims

### Claim 1

A common mode filter comprising:
a magnetic substrate;
a dielectric layer laminated on the magnetic substrate;
an external electrode formed on the dielectric layer in such a way that one surface thereof is exposed to an outside;
a conductive pattern formed in a single-layer structure and formed on a surface of the dielectric layer so as to be located on a same plane as the external electrode and having one end thereof connected with the external electrode;
an insulator film formed along a surface of the conductive pattern; and
a magnetic layer, comprising magnetic powder and resin material, formed on the insulator film so as to cover an upper surface and a lateral surface of the conductive pattern, and formed in between neighboring conductors of the conductive pattern.

### Claim 2 (depends on 1)

The common mode filter of claim 1, wherein the conductive pattern comprises a plurality of straight-line parts and a plurality of connection parts configured to connect the plurality of straight-line parts with each other.

### Claim 3 (depends on 2)

The common mode filter of claim 2, wherein the connection part is in the shape of a curve.

### Claim 4 (depends on 2)

The common mode filter of claim 2, wherein the conductive pattern is in a zigzag shape.

### Claim 5 (depends on 1)

The common mode filter of claim 1, wherein the insulator film comprises an oxide film.

### Claim 6 (depends on 1)

The common mode filter of claim 1, wherein the insulator film is contiguously formed along the surface of the conductive pattern and on the dielectric layer.

### Claim at position 7

7-9. (canceled)

### Claim 10 (depends on 1)

The common mode filter of claim 1, wherein only one conductor pattern layer is provided on the magnetic substrate and under the magnetic layer.