The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 06, 2011
Filed:
Aug. 30, 2007
Shin-ichi Ohkoshi, Tokyo, JP;
Shiro Kuroki, Mishima, JP;
Shunsuke Sakurai, Yokohama, JP;
Asuka Namai, Tsukuba, JP;
Kimitaka Sato, Okayama, JP;
Shinya Sasaki, Okayama, JP;
Shin-ichi Ohkoshi, Tokyo, JP;
Shiro Kuroki, Mishima, JP;
Shunsuke Sakurai, Yokohama, JP;
Asuka Namai, Tsukuba, JP;
Kimitaka Sato, Okayama, JP;
Shinya Sasaki, Okayama, JP;
The University of Tokyo, Tokyo, JP;
DOWA Electronics Materials Co., Ltd., Tokyo, JP;
Abstract
Disclosed is a magnetic crystal for electromagnetic wave absorbing materials, having a structure of ε-MFeOwith 0<x<1, which has the same space group as that of an ε-FeOcrystal and which is derived from an ε-FeOcrystal by substituting a part of the Fe site therein with M. In this, M is a trivalent element having an effect of lowering the coercive force Hc of ε-FeOcrystal by the substitution. Concretely, the element M includes Al and Ga. An electromagnetic wave absorber having a packed structure of particles having such a substituent element M-added 'M-substituted ε-FeOcrystal' as the magnetic phase may control the electromagnetic wave absorption peak frequency depending on the degree of substitution with the element M, and for example, the invention gives an electromagnetic wave absorber applicable to a 76 GHz band for on-vehicle radars.