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公开(公告)号：US11804659B2
公开(公告)日：2023-10-31
申请号：US16632066
申请日：2018-07-20
申请人： Maxell, Ltd.
发明人： Toshio Hiroi , Masao Fujita
CPC分类号： H01Q17/004 , C01G49/00 , C08K3/04 , C08K3/22 , H05K9/0075 , C08K2003/2272 , C08L101/12
摘要： Provided are an electromagnetic-wave absorbing composition that can favorably absorb electromagnetic waves of high frequencies in or above a millimeter-wave band and that can be applied to a desired portion in the form of a paste, and an easily deformable electromagnetic-wave absorber having flexibility. The electromagnetic-wave absorbing composition includes a rubber binder, a filler made of a particulate carbon material, and a magnetic iron oxide that magnetically resonates in a frequency band in or above a millimeter-wave band as an electromagnetic-wave absorbing material. The electromagnetic-wave absorber includes a rubber binder 1b, a filler 1c made of a particulate carbon material, and a magnetic iron oxide that magnetically resonates in a frequency band in or above a millimeter-wave band as an electromagnetic-wave absorbing material 1a, and is a nonresonant-type electromagnetic-wave absorber that is not provided with a reflective layer for reflecting incident electromagnetic waves.
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公开(公告)号：US11587705B2
公开(公告)日：2023-02-21
申请号：US16645547
申请日：2018-09-12
申请人： Maxell, Ltd.
发明人： Masao Fujita , Toshio Hiroi
摘要： Provided is an electromagnetic-wave absorber composition and an electromagnetic-wave absorber that can favorably absorb a plurality of electromagnetic waves of different frequencies in a high frequency band in or above the millimeter-wave band. The electromagnetic-wave absorber composition includes a magnetic iron oxide that magnetically resonates at a high frequency in or above the millimeter-wave band and a resin binder. The electromagnetic-wave absorber composition has two or more extrema separated from each other on a differential curve obtained by differentiating a magnetic property hysteresis loop at an applied magnetic field intensity of from 16 kOe to −16 kOe. The electromagnetic-wave absorber includes an electromagnetic-wave absorbing layer formed of the above-described electromagnetic-wave absorber composition.
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公开(公告)号：US11515643B2
公开(公告)日：2022-11-29
申请号：US17473450
申请日：2021-09-13
申请人： Maxell, Ltd.
发明人： Masao Fujita , Toshio Hiroi
摘要： 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.
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