Multi-layered electromagnetic wave absorber and manufacturing method thereof

• US 9,070,981 B2
• Filed: 12/08/2011
• Issued: 06/30/2015
• Est. Priority Date: 01/25/2011
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Ki Yeon, Yoon, Seong Ho, Hong, Eun Seok
• Primary Examiner(s): Sotomayor, John B
• Application Number:
  US13/314,446
• Publication Number:
  US 20120188114A1
• Time in Patent Office: 1,300 Days
• Field of Search: 342 1- 4
• US Class Current: 1/1
• CPC Class Codes: B32B 2305/076 Prepregs
• CPC Class Codes: B32B 2307/204 Di-electric
• CPC Class Codes: B32B 2307/208 Magnetic, paramagnetic
• CPC Class Codes: B32B 2315/085 Glass fiber cloth or fabric
• CPC Class Codes: B32B 2363/00 Epoxy resins
• CPC Class Codes: B32B 2457/00 Electrical equipment
• CPC Class Codes: B32B 38/08 Impregnating
• CPC Class Codes: H01Q 17/00 Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
• CPC Class Codes: H05K 9/0088 comprising a plurality of shielding layers; combining different shielding material structure

Abstract

A multi layer electromagnetic wave absorber is provided. The absorber includes a surface layer comprising at least one of a dielectric lossy mixture and a magnetic lossy mixture, an absorption layer, laminated on a rear side of the surface layer, comprising: a dielectric lossy mixture having a higher loss than the dielectric lossy mixture for the surface layer, and a magnetic lossy mixture having a higher loss than the magnetic lossy mixture for the surface layer, and a boundary layer, laminated on a rear side of the absorption layer, comprising a conductive material.

Claims

1. A multi-layer electromagnetic wave absorber comprising:

a surface layer comprising at least one of a dielectric lossy mixture and a magnetic lossy mixture;

an absorption layer, laminated on a rear side of the surface layer, comprising;

a dielectric lossy mixture having a higher loss than the dielectric lossy mixture for the surface layer; and

a magnetic lossy mixture having a higher loss than the magnetic lossy mixture for the surface layer; and

a boundary layer, laminated on a rear side of the absorption layer, comprising a conductive material.

2. The multi-layer electromagnetic wave absorber of claim 1, wherein the absorption layer comprises:

a dielectric lossy sheet comprising the dielectric lossy mixture for the absorption layer; and

a magnetic lossy sheet comprising the magnetic lossy mixture for the absorption layer.

3. The multi-layer electromagnetic wave absorber of claim 2, wherein the dielectric lossy sheet and the magnetic lossy sheet are alternately laminated to each other in the absorption layer.

4. The multi-layer electromagnetic wave absorber of claim 1, wherein the surface layer comprises:

a dielectric lossy sheet comprising the dielectric lossy mixture for the surface layer; and

a magnetic lossy sheet comprising the magnetic lossy mixture for the surface layer.

5. The multi-layer electromagnetic wave absorber of claim 4, wherein the dielectric lossy sheet and the magnetic lossy sheet are alternately laminated to each other in the surface layer.

6. The multi-layer electromagnetic wave absorber of claim 1, wherein an average dielectric loss tangent of the absorption layer is greater than an average dielectric loss tangent of the surface layer.

7. The multi-layer electromagnetic wave absorber of claim 1, wherein an average magnetic loss tangent of the absorption layer is greater than an average magnetic loss tangent of the surface layer.

8. The multi-layer electromagnetic wave absorber of claim 1, wherein a content ratio of dielectric lossy material of the dielectric lossy mixture for the absorption layer is higher than a content ratio of dielectric lossy material of the dielectric lossy mixture for the surface layer.

9. The multi-layer electromagnetic wave absorber of claim 1, wherein a content ratio of magnetic lossy material of the magnetic lossy mixture for the absorption layer is higher than a content ratio of magnetic lossy material of the magnetic lossy mixture for the surface layer.

10. The multi-layer electromagnetic wave absorber of claim 8, wherein the dielectric lossy material comprises a carbon nano particle.

11. The multi-layer electromagnetic wave absorber of claim 9, wherein the magnetic lossy material comprises a ferromagnetic field material.