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Indexed by:期刊论文

Date of Publication:2010-07-01

Journal:JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

Included Journals:SCIE、EI

Volume:322

Issue:13

Page Number:1736-1740

ISSN No.:0304-8853

Key Words:Carbonyl-iron powder; Microwave absorption; Permittivity; Permeability; Reflection loss

Abstract:To solve more and more serious electromagnetic interference problem, one thin microwave absorbing sheet employing carbonyl-iron powder (CIP) and chlorinated polyethylene (CPE) was prepared. The pattern, static magnetic properties and phase of CIP were characterized by scanning electron microscope (SEM), vibrating sample magnetometer (VSM) and X-ray diffraction (XRD), respectively. The electromagnetic parameters of CIP were measured in the frequency range of 2-18 GHz, and the electromagnetic loss mechanisms of the powder were discussed. The microwave absorption properties of composite sheets with different thicknesses and CIP ratios in matrix were investigated by measuring reflection loss (RL) in 2-18 GHz frequency range using the arch method. The results showed that appropriate CIP content and thickness could greatly improve microwave absorption properties in lower frequency range. For the sample with the weight ratio (CIP:CPE) of 16:1 and 1.5 mm thickness, the bandwidth (RL below -10 dB) achieved 1.1 GHz (2-3.1 GHz), and the minimum reflection loss value was obtained -13.2 dB at 2.2 GHz. This suggested that CIP/CPE composites could be applied as thin microwave absorbers in S-band (2-4 GHz). (C) 2009 Elsevier B.V. All rights reserved.