Common mode filter for improving magnetic permeability and high frequency characteristics

Patent metadata

Field	Value
Publication number	US-2016307687-A1
Application number	US-201615099921-A
Country	US
Kind code	A1
Filing date	Apr 15, 2016
Priority date	Apr 16, 2015
Publication date	Oct 20, 2016
Grant date	—

Abstract

A common mode filter includes a magnetic substrate in which ferrite particles having anisotropy and a planar structure are disposed to have a planar orientation.

First claim

What is claimed is:

1 . A common mode filter comprising: a magnetic substrate in which ferrite particles having anisotropy and a planar structure have planar magnetic anisotropy.

2 . The common mode filter of claim 1 , wherein the ferrite particles include hexaferrite particles having a plate shape, and
the planar magnetic anisotropy is formed depending on an arrangement of the hexaferrite particles having the plate shape.

3 . The common mode filter of claim 1 , wherein at least one of magnetic permeability and a resonance frequency is adjusted by adjusting at least one of a size, a length, and the planar structure of the ferrite particles.

4 . The common mode filter of claim 1 , wherein the planar magnetic anisotropy possessed by the ferrite particles is disposed in at least one of a vertical direction and a horizontal direction of the magnetic substrate.

5 . The common mode filter of claim 2 , wherein the hexaferrite particles have a size of 50 μm or less.

6 . A common mode filter comprising:
a coil part including an insulating layer and a conductor pattern formed in the insulating layer; and a magnetic substrate coupled to one or both surfaces of the coil part, wherein the magnetic substrate is provided with ferrite particles having anisotropy and a planar structure.

7 . The common mode filter of claim 6 , wherein the ferrite particles have planar magnetic anisotropy.

8 . The common mode filter of claim 6 , wherein an upper portion of the magnetic substrate is coupled to an upper surface of the coil part, and the ferrite particles disposed in the upper portion of the magnetic substrate are disposed horizontally in an upper portion of the upper portion of the magnetic substrate.

9 . The common mode filter of claim 8 , further including ferrite particles disposed vertically in a lower portion of the upper portion of the magnetic substrate.

10 . The common mode filter of claim 6 , wherein a lower portion of the magnetic substrate is coupled to a lower surface of the coil part, and the ferrite particles disposed in the lower portion of the magnetic substrate are disposed horizontally in a lower portion of the lower portion of the magnetic substrate.

11 . The common mode filter of claim 10 , further including ferrite particles disposed vertically in an upper portion of the lower portion of the magnetic substrate.

12 . A common mode filter comprising: a magnetic substrate in which a permanent magnet having anisotropy and a planar structure has planar magnetic anisotropy.

13 . The common mode filter of claim 12 , wherein the planar magnetic anisotropy possessed by the permanent magnet is disposed in at least one of a vertical direction and a horizontal direction of the magnetic substrate.

Assignees

• Samsung Electro Mech

Inventors

• Kim Chin Mo
• Seo Jung Wook
• Na Eun Hye
• Kim Hak Kwan
• Jeon Hyung Jin
• An Sung Yong

Classifications

• H01F27/255 Primary

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

• H01F27/2804

  Printed windings · CPC title

• H01F2017/0093

  Common mode choke coil · CPC title

• H01F17/0013

  with stacked layers · CPC title

• H01F1/348

  Hexaferrites with decreased hardness or anisotropy, i.e. with increased permeability in the microwave (GHz) range, e.g. having a hexagonal crystallographic structure · CPC title