§
Luxuse
Patent Intelligence
Sign In
Patent US5453745A successfully refreshed from Google Patents.
← Back to Patent Explorer
US5453745A Expired / Lapsed US ⏱️ 0.0 years remaining

Wideband wave absorber

Assignee: Mitsubishi Cable Industries Ltd
•
Filing: 1993-11-23
•
Granted: 1995-09-26
•
Expires: 2013-11-23
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A wideband wave absorber of the present invention comprising a sintered magnetic tile and a mat fiber assembly comprising ferrite powder adhered directly or indirectly to the fibers therein, said magnetic powder being adhered to the mat fiber assembly by the step of (a) coating a paint composed of the magnetic powder and a latex, (b) thermally spraying the magnetic powder over the mat fiber assembly, or (c) dusting the magnetic powder on the fibers in the assembly having an adhesive layer formed on their surfaces and covering said powder with an adhesive layer, wherein said mat fiber assembly desirably has a density transition effectuated from the top surface to the inside with increasing density, or has a constant density in its entirety and comprises increasing amounts of adhered magnetic powder from the top surface toward the rear side. According to the present invention, a wave absorber can be made very thin and capable of absorbing waves over a wide range of frequencies. The thin wave absorber results in reduction of cost and can be suitably used in anechoic chambers without occupying much space.

Inventors

  • 👤 Toshio Kudo
  • 👤 Kiyoshi Furukawa
  • 👤 Yoshiaki Ueda

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 13:48
CPC Classifications
H; H01; H01Q; H01Q17/00; H01Q17/005; H01Q17/004

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 30 words
A wideband wave absorber comprising a sintered magnetic tile and a mat fiber assembly comprising a magnetic powder adhered directly or indirectly to a fiber in the mat fiber assembly.
Claim 2
Dependent Claim 30 words
A wideband wave absorber comprising a sintered magnetic tile and a mat fiber assembly comprising a magnetic powder adhered directly or indirectly to a fiber in the mat fiber assembly.
Claim 3
Dependent Claim 24 words
The wideband wave absorber of claim 1, wherein a paint comprising the magnetic powder and a latex is coated on the mat fiber assembly.
Claim 4
Dependent Claim 22 words
The wideband wave absorber of claim 1, wherein the magnetic powder is directly adhered to the mat fiber assembly by thermally spraying.
Claim 5
Dependent Claim 31 words
The wideband wave absorber of claim 1, wherein an adhesive layer is provided on a surface of the fiber, and the magnetic powder is fixed to the fiber the adhesive layer.
Claim 6
Dependent Claim 25 words
The wideband wave absorber of claim 1, wherein the mat fiber assembly has graded density from the top surface to the bottom with increasing density.
Claim 7
Dependent Claim 45 words
The wideband wave absorber of claim 5, wherein the mat fiber assembly has a density of from 10 kg/m 3 to 40 kg/m 3 at the incident surface and a density of from 40 kg/m 3 to 80 kg/m 3 at the opposite side thereof.
Claim 8
Dependent Claim 59 words
A wideband wave absorber comprising, a sintered magnetic tile and a mat fiber assembly comprising a magnetic powder adhered directly or indirectly to a fiber in the mat fiber assembly, wherein the density of the fiber assembly is constant and the mount of the magnetic powder adhered to the assembly is increased from the top surface to the bottom.
Claim 9
Dependent Claim 59 words
A wideband wave absorber comprising, a sintered magnetic tile and a mat fiber assembly comprising a magnetic powder adhered directly or indirectly to a fiber in the mat fiber assembly, wherein the density of the fiber assembly is constant and the mount of the magnetic powder adhered to the assembly is increased from the top surface to the bottom.
Claim 10
Dependent Claim 22 words
The wideband wave absorber of claim 1, wherein the mat fiber assembly has a thickness of from 20 mm to 80 mm.
Claim 11
Dependent Claim 33 words
The wideband wave absorber of claim 1, wherein the mat fiber assembly is made of a synthetic fiber made from (a) polar organic polymer(s) having a dielectric constant of not less than 2.8.
Claim 12
Dependent Claim 53 words
A wideband wave absorber comprising a sintered magnetic title and a mat fiber assembly comprising a magnetic powder adhered directly or indirectly to a fiber in the mat fiber assembly, wherein the mat fiber assembly comprises 10-90% by weight of 50-200 denier thin fibers and 90-10% by weight of 500-1200 denier thick fibers.
Claim 13
Dependent Claim 53 words
A wideband wave absorber comprising a sintered magnetic title and a mat fiber assembly comprising a magnetic powder adhered directly or indirectly to a fiber in the mat fiber assembly, wherein the mat fiber assembly comprises 10-90% by weight of 50-200 denier thin fibers and 90-10% by weight of 500-1200 denier thick fibers.

References Cited (Backward Citations)

US5312678A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1998-09-25 1999-03-27 1999-09-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2002-09-25 2003-03-27 2003-09-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2006-09-25 2007-03-27 2007-09-26 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag