Radio wave absorber

Abstract

According to the present invention, a radio wave absorber 1 is provided with a substrate 10 and a radio wave absorption film 20 that is formed on the substrate 10. The radio wave absorption film 20 contains at least MTC-type epsilon-Fe2O3 and black titanium oxide. The MTC-type epsilon-Fe2O3 is a crystal that has the same space group as an epsilon-Fe2O3 crystal, while being represented by formula epsilon-MxTiyCoyFe2-2y-xO3 (wherein M represents at least one element selected from among Ga, In, Al and Rh; 0 < x < 1; and 0 < y < 1).

Description

technical field [0001] The present disclosure relates generally to a radio wave absorber, and more particularly to a radio wave absorber including a base member and a radio wave absorbing film. Background technique [0002] Recently, more and more vehicles are equipped with collision damage mitigation brakes to detect any obstacle in their surroundings and avoid a collision with this obstacle. As sensors used for such collision damage mitigation brakes, millimeter-wave radar devices, infrared radar devices, and image recognition devices using cameras are known in the art. In particular, millimeter-wave radar devices have attracted much attention in the field because this type of device is hardly adversely affected by backlight, rain, fog, or any other harsh conditions, and can be effectively applied even at night or even in Capture images in severe weather where the field of view is often narrow. [0003] The millimeter-wave radar device mainly uses radio waves in the 76GH...

AI Technical Summary

Problems solved by technology

Therefore, in the known radio wave absorber, its frequency range with high return loss may have too narrow a bandwidth to sufficiently remove the direct wave

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