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论文类型：期刊论文

发表时间：2013-03-01

发表刊物：JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS

收录刊物：EI、SCIE、Scopus

卷号：24

期号：3

页面范围：968-973

ISSN号：0957-4522

摘要：Carbonyl-iron and Fe91.2Si3.1P2.9Sb2.8 powder used as dual-fillers for thin microwave absorbers were firstly prepared by a simple mechanical mixture technique. The patterns and magnetic properties of carbonyl-iron and Fe91.2Si3.1P2.9Sb2.8 were characterized by scanning electron microscope and vibrating sample magnetometer The electromagnetic parameters were measured in the 2-7 GHz range by a HP8720B vector network analyzer. In comparison with carbonyl-iron and Fe91.2Si3.1P2.9Sb2.8 powder, the carbonyl-iron/Fe91.2Si3.1P2.9Sb2.8 composites powder exhibited excellent microwave absorption properties in the 2-7 GHz frequency range. The reflection loss was found to <-20 dB in the 2-7 GHz range for thickness of 2-5.3 mm, and the minimum reflection loss of -37 dB was observed at 5.2 GHz with a matching thickness of 2.5 mm. The excellent microwave absorption properties were firstly explained by using quantitatively coefficient of electromagnetic matching. In addition, a strong natural resonance was found in the carbonyl-iron/Fe91.2Si3.1P2.9Sb2.8 composites powder as an important reason bringing about the excellent microwave absorption.