Electromagnetic-wave-absorbing sheet
US-11152711-B2 · Oct 19, 2021 · US
Electromagnetic-wave-absorbing sheet
US11515643B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11515643-B2 |
| Application number | US-202117473450-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 13, 2021 |
| Priority date | Nov 4, 2016 |
| Publication date | Nov 29, 2022 |
| Grant date | Nov 29, 2022 |
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- Title
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Abstract
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An electromagnetic wave absorbing sheet is provided that can adequately absorb electromagnetic waves at high frequencies in and above the millimeter wave band, can have excellent flexibility, and can easily be placed in any desired portion.The electromagnetic wave absorbing sheet includes an electromagnetic wave absorbing layer 1 containing a magnetic iron oxide 1a that magnetically resonates at frequencies in and above the millimeter wave band and a resin binder 1b. The electromagnetic wave absorbing sheet absorbs radiated electromagnetic waves by magnetic resonance of the magnetic iron oxide. The electromagnetic wave absorbing sheet has a flexibility evaluation value F (g/mm2) of more than 0 and 6 or less, which is determined by measuring an applied weight (g) that is required to bend a ribbon-like electromagnetic wave absorbing sheet in the elastic deformation region so that a distance d between the inner surfaces of the ribbon-like sheet at a position L spaced 10 mm from the bent portion of the ribbon-like sheet is 10 mm, and dividing the applied weight (g) by a cross-sectional area D (mm2) of the ribbon-like sheet.
First claim
Opening claim text (preview).
The invention claimed is: 1. An electromagnetic wave absorbing sheet comprising: an electromagnetic wave absorbing layer containing a magnetic iron oxide that magnetically resonates at frequencies in and above a millimeter wave band and a resin binder, wherein a glass transition temperature (Tg) of the resin binder is 0° C. or less, a content of the magnetic iron oxide in the electromagnetic wave absorbing layer is 30% by volume or more, and a content of all inorganic filler powders, including the magnetic iron oxide, present in the binder in the electromagnetic wave absorbing layer is 50% by volume or less. 2. The electromagnetic wave absorbing sheet according to claim 1 , wherein the magnetic iron oxide is an epsilon iron oxide powder and/or a strontium ferrite powder. 3. The electromagnetic wave absorbing sheet according to claim 1 or 2 , wherein an adhesive layer is formed on a back side of the electromagnetic wave absorbing layer.
Assignees
Inventors
Classifications
Flexible bodies · CPC title
Screening of apparatus or components against electric or magnetic fields (devices for absorbing radiation from an antenna H01Q17/00) · CPC title
- H05K9/0075Primary
Magnetic shielding materials · CPC title
Electromagnetic shielding materials, e.g. EMI, RFI shielding (H05K9/0003 takes precedence) · CPC title
- H01Q17/00Primary
Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems · CPC title
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- What does patent US11515643B2 cover?
- An electromagnetic wave absorbing sheet is provided that can adequately absorb electromagnetic waves at high frequencies in and above the millimeter wave band, can have excellent flexibility, and can easily be placed in any desired portion.The electromagnetic wave absorbing sheet includes an electromagnetic wave absorbing layer 1 containing a magnetic iron oxide 1a that magnetically resonates a…
- Who is the assignee on this patent?
- Maxell Ltd
- What technology area does this patent fall under?
- Primary CPC classification H05K9/0075. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Nov 29 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).