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Suppression of electromagnetic radiation noise from wireless modules in the millimeter‐wave band by means of alumina containing carbon black
Author(s) -
Takase Yasuharu,
Hashimoto Osamu,
Matsumoto Kouta,
Kumada Taketo
Publication year - 2010
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.10216
Subject(s) - extremely high frequency , absorption (acoustics) , wireless , electromagnetic radiation , radiation , materials science , ka band , millimeter , acoustics , reflection (computer programming) , optics , electrical engineering , physics , computer science , engineering , telecommunications , programming language
Unwanted electromagnetic (EM) radiation generated from wireless modules in the millimeter‐wave band used for car radar creates errors and results in performance degradation of electronic equipment. In this paper, to reduce these unwanted EM waves, an optimal design to add the function of EM wave absorption to the lid for the module is examined. Alumina‐containing carbon black is used as a wave absorption material for the lid. Absorption of 20 dB or more is obtained as a measured result with the cover added for EM wave absorption at 60 GHz. The wireless module was also analyzed in the millimeter‐wave band with the designed material used for the lid. The radiation and the reflection of electric power were greatly reduced by the loss electric power from the lid. Therefore, effective data for suppressing unwanted EM radiation noise from wireless modules in the millimeter‐wave band can be provided. © 2010 Wiley Periodicals, Inc. Electron Comm Jpn, 93(10): 25–33, 2010; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/ecj.10216 3