Magnetic sheet and common mode filter including the same

Patent metadata

Field	Value
Publication number	US-10102959-B2
Application number	US-201615343560-A
Country	US
Kind code	B2
Filing date	Nov 4, 2016
Priority date	Nov 9, 2015
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

A common mode filter includes: an insulator; a coil pattern embedded within in the insulator; and a magnetic layer including a layer of material filled with different-size magnetic particles, wherein a surface of the magnetic layer is adhered to the insulator.

First claim

What is claimed is:

1. A common mode filter, comprising:
an insulator;
a coil pattern embedded within the insulator; and
a magnetic layer comprising a layer of material filled with magnetic particles and adhered to the insulator,
wherein different-size magnetic particles among the magnetic particles are disposed in a region of a first surface of the magnetic layer adhered to the insulator, and only similar-size particles among the magnetic particles are disposed in a region of a second surface of the magnetic layer opposite the first surface.

2. The common mode filter of claim 1 , wherein:
the layer of material comprises a sheet made of a resin material; and
the magnetic particles comprise spherical ferrite particles.

3. The common mode filter of claim 2 , wherein an amount of the spherical ferrite particles in the magnetic layer is 93 wt %.

4. The common mode filter of claim 1 , wherein the magnetic layer comprises magnetic layers laminated on a top surface of the insulator and a bottom surface of the insulator.

5. The common mode filter of claim 1 , further comprising a passivation layer disposed between the magnetic layer and the insulator.

6. The common mode filter of claim 1 , further comprising electrodes formed on lateral surfaces of the insulator and the magnetic layer, and connected to the coil pattern.

7. The common mode filter of claim 1 , wherein the magnetic layer is laminated on the insulator.

8. A common mode filter, comprising:
an insulating layer;
a coil pattern disposed in the insulating layer; and
a magnetic layer adhered to the insulating layer and comprising magnetic particles disposed in a resin,
wherein particles of different sizes, among the magnetic particles, are disposed in a region of a first surface of the magnetic layer contacting the insulating layer, and
wherein only particles of a similar size, among the magnetic particles, are disposed in a region of a second surface of the magnetic layer opposite the first surface.

9. The common mode filter of claim 8 , wherein the magnetic particles comprise spherical ferrite particles in an amount of 93 wt % of the magnetic layer.

Assignees

• Samsung Electro Mech

Inventors

• Lee Kwang-Jik
• CHOI Yu-Lim
• Yoo Myung-Jae

Classifications

• H01F1/37

  in a bonding agent · CPC title

• H05K999/99

  Electricity · mapped topic

• H01F17/0013

  with stacked layers · CPC title

• H01F27/292

  Surface mounted devices · CPC title

• H01F27/255 Primary

  made from particles (H01F27/26 takes precedence) · CPC title