# US 2014/0152402 A1 · Common mode noise chip filter and method for preparing thereof

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- Number: US 2014/0152402 A1
- Document ID: US20140152402A1
- Status: Published application
- Kind: A1
- Application number: 13/843,717
- Filed: 2013-03-15
- Published: 2014-06-05
- Earliest claimed: 2012-12-04
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Sang Moon LEE; Jun Hee BAE; Sung Kwon WI; Yong Suk KIM
- Web page: https://patentgrep.com/patent/US20140152402A1

## CPC

- H01F 17/0013: {with stacked layers}
- H01F 38/48: {Common mode inductor for reducing or eliminating common mode noise on parallel lines}
- H01F 2017/0066: {with a magnetic layer}
- Y10T 29/49016: Antenna or wave energy "plumbing" making
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed herein are a common mode noise chip filter and a method for preparing thereof, the common mode noise chip filter including: a ferrite substrate; coil patterns formed on the ferrite substrate; and a ferrite-polymer composite layer on the substrate provided with the coil patterns, wherein the ferrite-polymer composite layer includes spherical ferrite particles and flake shaped ferrite particles.

## Claims

### Claim 1

A common mode noise chip filter comprising:
a ferrite substrate;
coil patterns formed on the ferrite substrate; and
a ferrite-polymer composite layer on the substrate provided with the coil patterns,
wherein the ferrite-polymer composite layer includes spherical ferrite particles and flake shaped ferrite particles.

### Claim 2 (depends on 1)

The common mode noise chip filter according to claim 1, wherein the spherical ferrite particle and the flake shaped ferrite particle are included at a weight ratio of 1:10 to 10:1.

### Claim 3 (depends on 1)

The common mode noise chip filter according to claim 1, wherein the spherical ferrite particle includes at least two kinds of particles having different sizes.

### Claim 4 (depends on 1)

The common mode noise chip filter according to claim 1, wherein the flake shaped ferrite particle includes at least two kinds of particles having different sizes.

### Claim 5 (depends on 1)

The common mode noise chip filter according to claim 1, wherein the ferrite particle has an average particle size of 10 to 50 μm.

### Claim 6 (depends on 1)

The common mode noise chip filter according to claim 1, wherein the ferrite particle is made of a Ni—Zn—Cu based material.

### Claim 7 (depends on 1)

The common mode noise chip filter according to claim 1, wherein a polymer of the ferrite-polymer composite layer is at least one kind selected from a group consisting of an epoxy resin, a polyimide resin, a polyamide resin, and a polyaniline resin.

### Claim 8 (depends on 1)

The common mode noise chip filter according to claim 1, wherein the ferrite and a polymer of the ferrite-polymer composite layer are mixed at a weight ratio of 7:1 to 10:1.

### Claim 9

A method for preparing a common mode noise chip filter, the method comprising:
a first step of forming coil patterns on a ferrite substrate; and
a second step of filling a ferrite-polymer mixed dispersion in the ferrite substrate provided with the coil patterns formed to form a ferrite-polymer composite layer,
wherein in the ferrite-polymer composite layer, spherical ferrite particles and flake shaped ferrite particles are mixed and used.

### Claim 10 (depends on 9)

The method according to claim 9, wherein the spherical ferrite particle and the flake shaped ferrite particle are mixed at a weight ratio of 1:10 to 10:1.

### Claim 11 (depends on 9)

The method according to claim 9, wherein the ferrite particle has an average particle size of 10 to 50 μm.

### Claim 12 (depends on 9)

The method according to claim 9, wherein the spherical ferrite particle includes at least two kinds of particles having different sizes.

### Claim 13 (depends on 9)

The method according to claim 9, wherein the flake shaped ferrite particle includes at least two kinds of particles having different sizes.

### Claim 14 (depends on 9)

The method according to claim 9, wherein the ferrite particle is made of a Ni—Zn—Cu based material.

### Claim 15 (depends on 9)

The method according to claim 9, wherein a polymer of the ferrite-polymer composite layer is at least one kind selected from a group consisting of an epoxy resin, a polyimide resin, a polyamide resin, and a polyaniline resin.