Fabrication of graphene-magnetite multi-granule nanocluster composites for microwave absorption application

2019 ◽  
Vol 53 (28-30) ◽  
pp. 4097-4103
Author(s):  
Boo H An ◽  
Bum C Park ◽  
Hamad A Yassi ◽  
Ji S Lee ◽  
Jung-Rae Park ◽  
...  
Keyword(s):  
Absorption Coefficient ◽  
Microwave Absorption ◽  
Free Space ◽  
Relative Permittivity ◽  
Horn Antennas ◽  
Microwave Absorbing Properties ◽  
X Band ◽  
Permittivity And Permeability ◽  
Free Space Method ◽  
Space Method

Ferrite multi-granule nanoclusters are fabricated for microwave absorption materials in different sized particles and granules by modified polyol process. Various sizes of ferrite nanoclusters are placed on graphene-based composites and the behavior of their microwave absorbing properties is studied. The absorbing properties are measured using the free-space method with two horn antennas for X-band range (8.2 GHz–12.4 GHz). Relative permittivity and permeability values are calculated in measured frequency domain. The absorption coefficient changes by forming ferrite-graphene composites are presented as well.

Study on space absorbing of multilayer MWCNTs/Fe3O4/NBR composites

2021 ◽  
pp. 2150112
Author(s):  
Song Xinhua ◽  
Zhou Haiyang ◽  
Zhao Tiejun ◽  
Li Xiaojie ◽  
Yan Honghao
Keyword(s):  
Reflection Loss ◽  
Free Space ◽  
Large Scale ◽  
Comsol Multiphysics ◽  
Maximum Value ◽  
The Matrix ◽  
Attenuation Loss ◽  
Stealth Materials ◽  
Free Space Method ◽  
Space Method

In order to meet the requirements of “wide, thin, strong and light” for military stealth materials, it is of great practical value to study the absorbing characteristics of multi-layer MWCNTs/Fe3O4/NBR absorbing materials in space. First, we use the large-scale software COMSOL Multiphysics to simulate the absorbing characteristics of the composite thin plate in space. Then the four-port network matrix is used to calculate the absorbing characteristics of the composite plate in space. Finally, the Free-Space method is used to measure the reflection attenuation loss, and the results of the three methods are compared and analyzed. The results show that when the frequency is 10 GHz, the reflection loss of multi-layer MWCNTs/Fe3O4/NBR reaches the maximum value of −27.91, −27.01 and −22.56 dB by COMOSL numerical simulation, four-port network the matrix and Free-Space experimental measurement. The results of the three methods show that the reflection loss is less than −10 dB in the frequency band of 6–14 GHz.

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