公开(公告)号：US11806980B2

公开(公告)日：2023-11-07

申请号：US16621066

申请日：2018-03-27

Applicant: NITTO DENKO CORPORATION

Inventor： Kazuto Yamagata ,  Hironobu Machinaga ,  Eri Ueda ,  Hiroichi Ukei ,  Takehiro Ui

IPC: B32B7/025 ,  B32B15/20 ,  B32B15/082 ,  B32B27/30 ,  B32B27/36 ,  C23C14/08 ,  C23C14/35 ,  H05K9/00 ,  B32B27/08

CPC classification number: B32B7/025 ,  B32B15/082 ,  B32B27/308 ,  B32B27/36 ,  C23C14/086 ,  C23C14/35 ,  H05K9/0088 ,  B32B15/20 ,  B32B27/08 ,  B32B2250/03 ,  B32B2255/10 ,  B32B2255/205 ,  B32B2307/202 ,  B32B2307/204 ,  B32B2307/212

Abstract: An electromagnetic wave absorber (1) includes a dielectric layer (10), a resistive layer (20), and an electrically conductive layer (30). The resistive layer (20) is disposed on one principal surface of the dielectric layer (10). The electrically conductive layer (30) is disposed on the other principal surface of the dielectric layer (10) and has a sheet resistance lower than a sheet resistance of the resistive layer (20). The resistive layer (20) has a sheet resistance of 200 to 600Ω/□. When the resistive layer (20) is subjected to an immersion treatment in which the resistive layer (20) is immersed in a 5 weight % aqueous solution of NaOH for 5 minutes, an absolute value of a difference between a sheet resistance of the resistive layer (20) before the immersion treatment and a sheet resistance of the resistive layer (20) after the immersion treatment is less than 100Ω/□.

公开(公告)号：US11622482B2

公开(公告)日：2023-04-04

申请号：US16621078

申请日：2018-03-27

Applicant: NITTO DENKO CORPORATION

Inventor： Kazuto Yamagata ,  Hironobu Machinaga ,  Yuuki Takeda ,  Hiroichi Ukei ,  Takehiro Ui

IPC: H05K9/00 ,  B32B7/025 ,  B32B15/08 ,  B32B7/06

Abstract: An electromagnetic wave absorber (1) includes a dielectric layer (10), a resistive layer (20), and an electrically conductive layer (30). The resistive layer (20) is disposed on one principal surface of the dielectric layer (10). The electrically conductive layer (30) is disposed on the other principal surface of the dielectric layer (10) and has a sheet resistance lower than a sheet resistance of the resistive layer (20). The resistive layer (20) is a layer that includes tin oxide or titanium oxide as a main component or a layer that is made of indium tin oxide including 40 weight % or more of tin oxide.

公开(公告)号：US20230077842A1

公开(公告)日：2023-03-16

申请号：US17796938

申请日：2021-01-14

Applicant: NITTO DENKO CORPORATION

Inventor： Yuya Matsuzaki ,  Kazuhiro Fuke ,  Takehiro Ui

IPC: H05K9/00

Abstract: A composite material and an electromagnetic wave absorber made by molding the same, which are capable of exhibiting an excellent electromagnetic wave absorption function and capable of suppressing the deterioration of mechanical properties of the electromagnetic wave absorber itself. A composite material comprising a single type of thermoplastic resin and a conductive filler contained in a dispersed state in the thermoplastic resin, wherein the composite material includes at least one portion A and a portion B with different conductive filler content percentages in a mixed manner, and wherein the ratio of the conductive filler content percentage in the portion A to the conductive filler content percentage in the portion B is greater than 1.0; and an electromagnetic wave absorber made by molding the same.

公开(公告)号：US11266048B2

公开(公告)日：2022-03-01

申请号：US16957885

申请日：2018-12-28

Applicant: NITTO DENKO CORPORATION

Inventor： Kazuto Yamagata ,  Hironobu Machinaga ,  Hiroichi Ukei ,  Takehiro Ui

IPC: H05K9/00 ,  H01Q17/00

Abstract: An electromagnetic wave absorber (1a) includes a resistive layer (10), an electrically conductive layer (20) and a dielectric layer (30). The electrically conductive layer (20) has a sheet resistance lower than a sheet resistance of the resistive layer (10). The dielectric layer (30) is disposed between the resistive layer (10) and the electrically conductive layer (20). The electromagnetic wave absorber (1a) has a first slit (15). The first slit (15) extends, in the resistive layer (10), from a first principal surface (10a) distal to the dielectric layer (30) toward the dielectric layer (30) in a direction perpendicular to the first principal surface (10a) and divides the resistive layer (10) into a plurality of first blocks (17). Each of the first blocks (17) has a minimum dimension (D1) of 2 mm or more at the first principal surface (10a).

公开(公告)号：US20200207059A1

公开(公告)日：2020-07-02

申请号：US16621066

申请日：2018-03-27

Applicant: NITTO DENKO CORPORATION

Inventor： Kazuto Yamagata ,  Hironobu Machinaga ,  Eri Ueda ,  Hiroichi Ukei ,  Takehiro Ui

IPC: B32B7/025 ,  H05K9/00 ,  C23C14/35 ,  C23C14/08 ,  B32B15/082 ,  B32B27/36 ,  B32B27/30

Abstract: An electromagnetic wave absorber (1) includes a dielectric layer (10), a resistive layer (20), and an electrically conductive layer (30). The resistive layer (20) is disposed on one principal surface of the dielectric layer (10). The electrically conductive layer (30) is disposed on the other principal surface of the dielectric layer (10) and has a sheet resistance lower than a sheet resistance of the resistive layer (20). The resistive layer (20) has a sheet resistance of 200 to 600Ω/□. When the resistive layer (20) is subjected to an immersion treatment in which the resistive layer (20) is immersed in a 5 weight % aqueous solution of NaOH for 5 minutes, an absolute value of a difference between a sheet resistance of the resistive layer (20) before the immersion treatment and a sheet resistance of the resistive layer (20) after the immersion treatment is less than 100Ω/□.

公开(公告)号：US20180319138A1

公开(公告)日：2018-11-08

申请号：US15774077

申请日：2016-12-14

Applicant: NITTO DENKO CORPORATION

Inventor： Hiroichi Ukei ,  Takehiro Ui ,  Kazuto Yamagata ,  Yuki Takeda ,  Hironobu Machinaga ,  Yuya Kitagawa ,  Kazuaki Sasa

IPC: B32B27/18 ,  H05K9/00 ,  G01S13/93

CPC classification number: B32B27/18 ,  B32B7/12 ,  B32B27/08 ,  B32B27/28 ,  B32B27/30 ,  B32B27/304 ,  B32B27/306 ,  B32B2255/06 ,  B32B2255/10 ,  B32B2255/205 ,  B32B2264/102 ,  B32B2264/105 ,  B32B2457/00 ,  G01S13/931 ,  H01Q1/3283 ,  H01Q17/00 ,  H05K9/00 ,  H05K9/0088

Abstract: For the purpose of providing an electromagnetic wave absorber usable for radar having a high revolution and sufficiently adaptable to a plurality of radars different in frequency, the bandwidth of a frequency band in which an electromagnetic wave absorption amount is not less than 20 dB is not less than 2 GHz, within a frequency band of 60 to 90 GHz.

公开(公告)号：US20230356500A1

公开(公告)日：2023-11-09

申请号：US18224730

申请日：2023-07-21

Applicant: NITTO DENKO CORPORATION

Inventor： Kazuto Yamagata ,  Hironobu Machinaga ,  Eri Ueda ,  Hiroichi Ukei ,  Takehiro Ui

IPC: B32B7/025 ,  B32B15/082 ,  B32B27/30 ,  B32B27/36 ,  C23C14/08 ,  C23C14/35 ,  H05K9/00

CPC classification number: B32B7/025 ,  B32B15/082 ,  B32B27/308 ,  B32B27/36 ,  C23C14/086 ,  C23C14/35 ,  H05K9/0088 ,  B32B2255/10 ,  B32B2307/202 ,  B32B2307/204 ,  B32B2307/212 ,  B32B15/20

Abstract: An electromagnetic wave absorber (1) includes a dielectric layer (10), a resistive layer (20), and an electrically conductive layer (30). The resistive layer (20) is disposed on one principal surface of the dielectric layer (10). The electrically conductive layer (30) is disposed on the other principal surface of the dielectric layer (10) and has a sheet resistance lower than a sheet resistance of the resistive layer (20). The resistive layer (20) has a sheet resistance of 200 to 600 Ω/□. When the resistive layer (20) is subjected to an immersion treatment in which the resistive layer (20) is immersed in a 5 weight % aqueous solution of NaOH for 5 minutes, an absolute value of a difference between a sheet resistance of the resistive layer (20) before the immersion treatment and a sheet resistance of the resistive layer (20) after the immersion treatment is less than 100 Ω/□.

公开(公告)号：US11476586B2

公开(公告)日：2022-10-18

申请号：US17264095

申请日：2020-06-05

Applicant: NITTO DENKO CORPORATION

Inventor： Takehiro Ui ,  Masatsugu Koso ,  Kazuhiro Fuke ,  Yuya Matsuzaki ,  Masataka Usui

IPC: B32B7/02 ,  H05K9/00 ,  H01Q17/00

Abstract: A radio wave absorbing member 1a includes a radio wave absorber 10 and a support 20 having a sheet shape. The radio wave absorber 10 includes a resistive layer 12, a reflective layer 14, and a dielectric layer 13. The reflective layer 14 reflects a radio wave. The dielectric layer 13 is disposed between the resistive layer 12 and the reflective layer 14 in the thickness direction of the reflective layer 14. The support 20 supports the radio wave absorber 10. The support 20 includes a matrix resin 20m and a flame retardant 20p.

公开(公告)号：US11387566B2

公开(公告)日：2022-07-12

申请号：US16619624

申请日：2018-01-23

Applicant: NITTO DENKO CORPORATION

Inventor： Hiroichi Ukei ,  Takehiro Ui ,  Hironobu Machinaga ,  Kazuto Yamagata ,  Yuuki Takeda

IPC: B32B7/025 ,  H01Q17/00 ,  B32B15/04 ,  B32B15/08

Abstract: An electromagnetic wave absorber (1a) includes a first layer (10) and an electrically conductive layer (20). The first layer (10) is a dielectric layer or a magnetic layer. The electrically conductive layer (20) is provided on at least one surface of the first layer. A product of a Young's modulus of the first layer (10) and a thickness of the first layer (10) is 0.1 to 1000 MPa·mm. The first layer (10) has a relative permittivity of 1 to 10.

公开(公告)号：US11145988B2

公开(公告)日：2021-10-12

申请号：US15774077

申请日：2016-12-14

Applicant: NITTO DENKO CORPORATION

Inventor： Hiroichi Ukei ,  Takehiro Ui ,  Kazuto Yamagata ,  Yuki Takeda ,  Hironobu Machinaga ,  Yuya Kitagawa ,  Kazuaki Sasa

IPC: H01Q17/00 ,  B32B27/30 ,  B32B27/08 ,  B32B15/08 ,  B32B33/00 ,  B32B7/12 ,  H05K9/00 ,  B32B27/28 ,  H01Q1/32 ,  B32B27/18 ,  G01S13/931 ,  B32B15/20

Abstract: For the purpose of providing an electromagnetic wave absorber usable for radar having a high revolution and sufficiently adaptable to a plurality of radars different in frequency, the bandwidth of a frequency band in which an electromagnetic wave absorption amount is not less than 20 dB is not less than 2 GHz, within a frequency band of 60 to 90 GHz.