# US 2014/0153147 A1 · Method for manufacturing magnetic substrate and common mode filter

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- Number: US 2014/0153147 A1
- Document ID: US20140153147A1
- Status: Published application
- Kind: A1
- Application number: 14/173,699
- Filed: 2014-02-05
- Published: 2014-06-05
- Earliest claimed: 2011-09-05
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Sung Kwon WI; Jeong Bok KWAK; Sang Moon LEE; Young Seuck YOO; Yong Suk KIM
- Web page: https://patentgrep.com/patent/US20140153147A1

## CPC

- H01F 27/2804: {Printed windings}
- H01F 17/0013: {with stacked layers}
- H01F 27/288: {Shielding}
- H01F 27/343: {Preventing or reducing surge voltages; oscillations}
- H01F 19/00: Fixed transformers or mutual inductances of the signal type (H01F36/00 takes precedence)
- H01F 27/24: Magnetic cores
- H01F 27/28: Coils; Windings; Conductive connections
- H01F 38/48: {Common mode inductor for reducing or eliminating common mode noise on parallel lines}
- H01F 41/042: {by thin film techniques}
- H01F 2017/0066: {with a magnetic layer}
- H01F 2017/008: {Electric or magnetic shielding of printed inductances}
- H05K 1/0233: {Filters, inductors or a magnetic substance}
- H05K 1/165: {incorporating printed inductors}
- H05K 3/4629: {laminating inorganic sheets comprising printed circuits, e.g. green ceramic sheets}
- Y10T 29/49002: Electrical device making
- Y10T 29/4902: Electromagnet, transformer or inductor
- Y10T 29/49208: by assembling plural parts
- Y10T 29/49211: of fused material
- Y10T 29/49936: Surface interlocking
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A common mode filter is manufactured to include a coil part including an insulation layer and a conductor pattern formed in the insulation layer; and a magnetic substrate coupled to one surface or both surfaces of the coil part. The magnetic substrate includes: an electrostatic absorbing layer made of an electrostatic absorbing material; a magnetic layer provided on one surface or both surfaces of the electrostatic absorbing layer and made of a magnetic material; and an electrode provided between the magnetic layer and the electrostatic absorbing layer and made of a conductive material. Therefore, common mode filter may maintain high efficiency characteristics while preventing an electrostatic discharge phenomenon.

## Claims

### Claim 1

A magnetic substrate comprising:
an electrostatic absorbing layer made of an electrostatic absorbing material;
a magnetic layer provided on one surface or both surfaces of the electrostatic absorbing layer and made of a magnetic material; and
an electrode provided between the magnetic layer and the electrostatic absorbing layer and made of a conductive material.

### Claim 2 (depends on 1)

The magnetic substrate according to claim 1, wherein the electrostatic absorbing material is a zinc oxide (ZnO) based ceramic.

### Claim 3 (depends on 1)

The magnetic substrate according to claim 1, wherein the magnetic material is a ferrite of any one selected from a group consisting of Ni, Zn, Cu, and Mn.

### Claim 4 (depends on 1)

The magnetic substrate according to claim 1, wherein the conductive material is any one metal or an alloy of at least two metals selected from a group consisting of Ag, Cu Al, Ni, Pd, and Ag—Pd.

### Claim 5

A common mode filter comprising:
a coil part including an insulation layer and a conductor pattern formed in the insulation layer; and
a magnetic substrate coupled to one surface or both surfaces of the coil part,
wherein the magnetic substrate includes:
an electrostatic absorbing layer made of an electrostatic absorbing material;
a magnetic layer provided on one surface or both surfaces of the electrostatic absorbing layer and made of a magnetic material; and
an electrode provided between the magnetic layer and the electrostatic absorbing layer and made of a conductive material.

### Claim 6 (depends on 5)

The common mode filter according to claim 5, wherein the electrostatic absorbing material is a zinc oxide (ZnO) based ceramic.

### Claim 7 (depends on 5)

The common mode filter according to claim 5, wherein the magnetic material is a ferrite of any one selected from a group consisting of Ni, Zn, Cu, and Mn.

### Claim 8 (depends on 5)

The common mode filter according to claim 5, wherein the conductive material is any one metal or an alloy of at least two metals selected from a group consisting of Ag, Cu, Al, Ni, Pd, and Ag—Pd.

### Claim at position 9

9-21. (canceled)