Electromagnetic wave absorber and film forming paste
US-2016164187-A1 · Jun 9, 2016 · US
Electromagnetic-wave absorbing sheet
US2020008328A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2020008328-A1 |
| Application number | US-201816485306-A |
| Country | US |
| Kind code | A1 |
| Filing date | Mar 13, 2018 |
| Priority date | Mar 13, 2017 |
| Publication date | Jan 2, 2020 |
| Grant date | — |
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- Title
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Abstract
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An electromagnetic-wave absorbing sheet is realized which can favorably absorb electromagnetic waves with a high frequency in or above a millimeter-wave band, and has sufficient elasticity. The electromagnetic-wave absorbing sheet includes: an electromagnetic-wave absorbing layer 1 that includes a particulate electromagnetic-wave absorbing material 1a and a rubber binder 1b; and a dielectric layer 2 arranged on a back surface of the electromagnetic-wave absorbing layer. The electromagnetic-wave absorbing material is a magnetic iron oxide that magnetically resonates in a frequency band that is at least a millimeter-wave band. The dielectric layer is non-magnetic and has flexibility, a real part of a complex relative permittivity of the dielectric layer is 2 or more and 6 or less, and the dielectric layer has a thickness of 10 μm or more and 100 μm or less.
First claim
Opening claim text (preview).
1 . An electromagnetic-wave absorbing sheet comprising: an electromagnetic-wave absorbing layer that includes a particulate electromagnetic-wave absorbing material and a rubber binder; and a dielectric layer arranged on a back surface of the electromagnetic-wave absorbing layer, wherein the electromagnetic-wave absorbing material is a magnetic iron oxide that magnetically resonates in a frequency band in or above a millimeter-wave band, and the dielectric layer is non-magnetic and has flexibility, a real part of a complex relative permittivity of the dielectric layer is 2 or more and 6 or less, and the dielectric layer has a thickness of 10 μm or more and 100 μm or less. 2 . The electromagnetic-wave absorbing sheet according to claim 1 , wherein a reflective layer that reflects electromagnetic waves that have passed through the electromagnetic-wave absorbing layer and the dielectric layer is formed on a back surface of the dielectric layer. 3 . The electromagnetic-wave absorbing sheet according to claim 1 , wherein the electromagnetic-wave absorbing material is epsilon iron oxide or strontium ferrite. 4 . The electromagnetic-wave absorbing sheet according to claim 1 , wherein the electromagnetic-wave absorbing material is epsilon iron oxide, and a portion of Fe sites of the epsilon iron oxide are substituted with trivalent metal atoms. 5 . The electromagnetic-wave absorbing sheet according to claim 1 , wherein the dielectric layer is formed as a stacked body with two or more layers. 6 . The electromagnetic-wave absorbing sheet according to claim 1 , wherein the dielectric layer has adhesiveness.
Assignees
Inventors
Classifications
- H05K9/0075Primary
Magnetic shielding materials · CPC title
Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4 · CPC title
Ferric oxide [Fe2O3] · CPC title
with fibres or particles {being present as additives in the layer} · CPC title
comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition · CPC title
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- What does patent US2020008328A1 cover?
- An electromagnetic-wave absorbing sheet is realized which can favorably absorb electromagnetic waves with a high frequency in or above a millimeter-wave band, and has sufficient elasticity. The electromagnetic-wave absorbing sheet includes: an electromagnetic-wave absorbing layer 1 that includes a particulate electromagnetic-wave absorbing material 1a and a rubber binder 1b; and a dielectric la…
- Who is the assignee on this patent?
- Maxell Holdings 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 Thu Jan 02 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).