Radio wave absorber

Patent metadata

Field	Value
Publication number	US-2021151895-A1
Application number	US-201816626181-A
Country	US
Kind code	A1
Filing date	Jun 25, 2018
Priority date	Jun 30, 2017
Publication date	May 20, 2021
Grant date	—

Abstract

A radio wave absorber includes a base member, and a radio wave absorption film formed on the base member. The radio wave absorption film includes at least MTC-substituted ε-Fe2O3 and black titanium oxide. The MTC-substituted ε-Fe2O3 is a crystal belonging to the same space group as an ε-Fe2O3 crystal and expressed by ε-MxTiyCoyFe2−2y−xO3 where M is at least one element selected from the group consisting of Ga, In, Al, and Rh, 0<x<1, and 0<y<1.

First claim

1 . A radio wave absorber comprising:
a base member; and a radio wave absorption film formed on the base member, the radio wave absorption film including at least MTC-substituted ε-Fe 2 O 3 and black titanium oxide, the MTC-substituted ε-Fe 2 O 3 being a crystal belonging to the same space group as an ε-Fe 2 O 3 crystal and expressed by ε-M x Ti y Co y Fe 2−2y−x O 3 where M is at least one element selected from the group consisting of Ga, In, Al, and Rh, 0<x<1, and 0<y<1.

2 . The radio wave absorber of claim 1 , wherein
the black titanium oxide includes at least one compound selected from the group consisting of Ti 4 O 7 and λ-Ti 3 O 5 .

3 . The radio wave absorber of claim 1 , wherein
the radio wave absorption film further includes a cured product of a thermosetting resin.

4 . The radio wave absorber of claim 3 , wherein
the thermosetting resin includes at least one resin selected from the group consisting of epoxy resins, silicone resins, phenolic resins, and polyimide resins.

5 . The radio wave absorber of claim 1 , wherein
the radio wave absorption film further includes a ceramic.

6 . The radio wave absorber of claim 5 , wherein
the ceramic is made of a metal oxide.

7 . The radio wave absorber of claim 2 , wherein
the radio wave absorption film further includes a cured product of a thermosetting resin.

8 . The radio wave absorber of claim 7 , wherein
the thermosetting resin includes at least one resin selected from the group consisting of epoxy resins, silicone resins, phenolic resins, and polyimide resins.

9 . The radio wave absorber of claim 2 , wherein
the radio wave absorption film further includes a ceramic.

10 . The radio wave absorber of claim 9 , wherein
the ceramic is made of a metal oxide.

Assignees

• Univ Tokyo
• Panasonic Corp

Inventors

• Ohkoshi Shin-Ichi
• Namai Asuka
• Nishitani Seiji
• Kuzuu Tomohiro

Classifications

• C09K3/20

  as substitutes for glycerol in its non-chemical uses, e.g. as a base in toiletry creams or ointments · CPC title

• C09D5/032

  characterised by a special effect of the produced film, e.g. wrinkle, pearlescence, matt finish · CPC title

• B32B9/00

  Layered products comprising a {layer of a} particular substance not covered by groups B32B11/00 - B32B29/00 · CPC title

• B32B7/025

  Electric or magnetic properties · CPC title

• H01Q17/004 Primary

  using non-directional dissipative particles, e.g. ferrite powders (H01Q17/005 takes precedence; flake-like H01Q17/002) · CPC title