Configurable Faraday Cage
US-2024138131-A1 · Apr 25, 2024 · US
Particles for absorbing GHz-band electromagnetic wave and electromagnetic wave absorber including same
US11700718B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11700718-B2 |
| Application number | US-202017098657-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 16, 2020 |
| Priority date | Aug 25, 2020 |
| Publication date | Jul 11, 2023 |
| Grant date | Jul 11, 2023 |
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- Title
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Abstract
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An electromagnetic wave absorbing particle has a composition, which is represented by Formula 1 of Sr 1-x R x Fe y-2z M 2z O a and contains M-type hexaferrite as a main phase. In Formula 1, R is one or more substances selected from among Ba, Ca, and La, M is one or more substances selected from among Co, Ti, and Zr, 0<x≤0.8, 8≤y≤14, 0<z≤1.5, and a is equal to 19.
First claim
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What is claimed is: 1. An electromagnetic wave absorbing particle for a GHz frequency band, the electromagnetic wave absorbing particle having a composition represented by Formula 1 and having an M-type hexaferrite as a major phase, Sr 1-x R x Fe y-2z M 2z O a [Formula 1] where R is one or more substances selected from among Ba, Ca, and La, M is one or more substances selected from among Co, Ti and Zr, 0<x≤0.8, 8≤y≤14, 0<z≤1.5, and a=19, wherein the electromagnetic wave absorbing particle has a composition represented by Formula 2, Sr 1-x R x Fe y-2z Co z Ti z O 19 [Formula 2] where R is one or more substances selected from among Ba, Ca, and La, 0<x≤0.8, 8≤y≤14, and 0<z≤1.5. 2. The electromagnetic wave absorbing particle according to claim 1 , wherein, when Z has a value of 1.2, the electromagnetic wave absorbing particle absorbs electromagnetic waves in an 8 to 15 GHz frequency band. 3. The electromagnetic wave absorbing particle according to claim 2 , wherein x has a value of 0.094 to 0.15. 4. An electromagnetic wave absorber for a GHz frequency band, the electromagnetic wave absorber comprising: a polymer resin; and an electromagnetic wave absorbing particle having a composition represented by Formula and having an M-type hexaferrite as a major phase, Sr 1-x R x Fe y-2z M 2z O a [Formula 1] where R is one or more substances selected from among Ba, Ca, and La, M is one or more substances selected from among Co, Ti and Zr, 0<x≤0.8, 8≤y≤14, 0<z≤1.5, and a=19, wherein the electromagnetic wave absorbing particle has a composition represented by Formula 2, Sr 1-x R x Fe y-2z Co z Ti z O 19 [Formula 2] where R is one or more substances selected from among Ba, Ca, and La, 0<x≤0.8, 8≤y≤14, and 0<z≤1.5. 5. The electromagnetic wave absorber according to claim 4 , further comprising a permittivity adjusting agent. 6. The electromagnetic wave absorber according to claim 5 , wherein the permittivity adjusting agent is graphite. 7. The electromagnetic wave absorber according to claim 6 , wherein the permittivity adjusting agent is contained at a ratio of 5% by weight with respect to 100% by weight of the electromagnetic wave absorbing particle. 8. The electromagnetic wave absorber according to claim 7 , wherein the absorber absorbs electromagnetic waves in a frequency band of 24 GHz.
Assignees
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Classifications
Carbon · CPC title
of cobalt · CPC title
of iron · CPC title
by a space-group or by other symmetry indications · CPC title
- H05K9/0081Primary
Electromagnetic shielding materials, e.g. EMI, RFI shielding (H05K9/0003 takes precedence) · CPC title
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- What does patent US11700718B2 cover?
- An electromagnetic wave absorbing particle has a composition, which is represented by Formula 1 of Sr 1-x R x Fe y-2z M 2z O a and contains M-type hexaferrite as a main phase. In Formula 1, R is one or more substances selected from among Ba, Ca, and La, M is one or more substances selected from among Co, Ti, and Zr, 0<x≤0.8, 8≤y≤14, 0<z≤1.5, and a is equal to 19.
- Who is the assignee on this patent?
- Hyundai Motor Co Ltd, Kia Motors Corp, Korea National Univ Of Transportation Industry Academic Cooperation Foundation
- What technology area does this patent fall under?
- Primary CPC classification H05K9/0081. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jul 11 2023 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).