Hits:

Indexed by:期刊论文

Date of Publication:2013-03-01

Journal:JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS

Included Journals:EI、SCIE、Scopus

Volume:24

Issue:3

Page Number:968-973

ISSN No.:0957-4522

Abstract: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.