Double-layer microwave absorber based on CoFe2O4 ferrite and carbonyl iron composites

In this paper the powders of Zn1-xCoxO (x=0, 0.01, 0.02, 0.025, 0.05, 0.1) were fabricated by the conventional solid state reaction. The crystal structure was characterized by x-ray diffraction (XRD). The electromagnetic parameters were measured using vector network analyzer (VNA), the infrared emissivity in the wavelength range of 3-5μm and 8-14μm was measured by Dual-band infrared emissivity measuring instrument. The absorption bandwidth of the double-layer microwave absorber is obviously more than that of the single-layer absorber. The bandwidth of the double-layer microwave absorber for reflection loss R<-8dB is 2.64GHz over the range of 8.2-18GHz. The thickness of the absorbers is only 4 mm. The infrared emissivity is only 0.39 in the range of 3-5μm and 0.81 in the range of 8-14μm.

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Double-Layer Type Microwave Absorber Made of Magnetic-Dielectric Composite Material

Ferroelectrics ◽

10.1080/713716183 ◽

2002 ◽

Vol 271 (1) ◽

pp. 297-302 ◽

Cited By ~ 4

Author(s):

Mitsuru Saitoh ◽

Takashi Yamamoto ◽

Hirotake Okino ◽

Masaru Chino ◽

Masaki Kobayashi

Keyword(s):

Composite Material ◽

Double Layer ◽

Microwave Absorber ◽

Dielectric Composite ◽

Magnetic Dielectric

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Preparation and Characterization of High Magnetic Loss Microwave Absorber for Splitter Load

E3S Web of Conferences ◽

10.1051/e3sconf/202018603006 ◽

2020 ◽

Vol 186 ◽

pp. 03006

Author(s):

Lan Tian ◽

Dong Lichao ◽

Li Nan ◽

Zhang Chunbo ◽

Zhang Hao ◽

...

Keyword(s):

Mechanical Properties ◽

Iron Powder ◽

Carbonyl Iron ◽

Mechanical Performance ◽

Magnetic Loss ◽

Microwave Absorber ◽

Electromagnetic Properties ◽

Carbonyl Iron Powder ◽

Absorbing Material ◽

Microwave Absorbing

Microwave absorbing material was prepared using epoxy resin as matrix and spherical carbonyl iron powder (s-CIP), flaky carbonyl iron powder (f-CIP) as absorbing agent. Microwave absorbing, mechanical properties and structure of the composites containing different kinds of carbonyl iron powder (CIP) were investigated. The results show that the microwave absorber with flaky CIP have better electromagnetic properties than composites with spherical CIP. With concentration of spherical CIP increasing the electromagnetic properties of composites becomes better, except for the mechanical performance. The flaky CIP/epoxy resins composites with a loading of 79 wt% plate-like CIP has attenuation constant of 25.443 dB/cm in 3 GHz. The absorber prepared using flaky CIP has homogenous, dense structure and has excellent mechanical properties.

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