Studies on electromagnetic wave absorption characteristics of PMMA-CNF nanocomposite films in terahertz frequency range

2021 ◽  
Vol 127 (12) ◽  
Author(s):  
Najaf Rubab ◽  
Muhammad Mumtaz ◽  
Muhammad Zakria ◽  
Izhar Ahmad ◽  
Sabih D. Khan ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Nanocomposite Films ◽  
Terahertz Frequency ◽  
Frequency Range ◽  
Terahertz Frequency Range ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Absorption Characteristics

scholarly journals The Electromagnetic Wave Absorption Performance and Mechanical Properties of Cement-Based Composite Material Mixed with Functional Aggregates with High Fe2O3 and SiC

2021 ◽  
Vol 31 (4) ◽  
pp. 249-255
Author(s):  
Zuoqun Zhang ◽  
Chaoshan Yang ◽  
Hua Cheng ◽  
Xiaohan Huang ◽  
Yuhao Zhu
Keyword(s):  
Composite Material ◽  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Building Materials ◽  
Magnetic Loss ◽  
Frequency Range ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Test Board ◽  
Absorption Performance

Now there’re many researches on the electromagnetic radiation protection function of the cement-based electromagnetic wave absorbing materials, such materials have been widely used in various types of buildings. This paper proposed an idea for preparing a cement-based composite material by mixing functional aggregates with high content of Fe2O3 and SiC, that is, adding Fe3O4 powder and nano-SiC of different contents in the clay, and then sintering at 1190℃; the prepared aggregates showed obvious magnetic loss and dielectric loss to electromagnetic waves, and the numerical tube pressure could reach 16.83MPa. The double-layer reflectivity test board made of functional aggregates showed excellent electromagnetic wave absorption performance, its reflection loss was less than -10dB in the frequency range of 8~18GHz (corresponding to energy absorption greater than 90% EM), and its maximum RL reached -12.13dB. In addition, the compressive strength of the cement-based composite material at the age of 28 days reached 50.1 MPa, which can meet the strength requirements of building materials.

scholarly journals Magnetic and Electromagnetic Wave Absorption Characteristics of BaFe11Ti0.5Zn0.5O19 in X Band

2019 ◽  
Vol 553 ◽  
pp. 012001
Author(s):  
Dedi ◽  
Novrita Idayanti ◽  
Tony Kristiantoro ◽  
Nanang Sudrajat ◽  
Arighi Gustinova ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
X Band ◽  
Absorption Characteristics

Influence of Zn dispersion in SiC on electromagnetic wave absorption characteristics

2018 ◽  
Vol 738 ◽  
pp. 448-460 ◽  
Author(s):  
Samarjit Singh ◽  
Sankalp Shukla ◽  
Abhishek Kumar ◽  
Dharmendra Singh
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Absorption Characteristics

scholarly journals Estimation of losses per unit length in a rectangular waveguide with rough screening surfaces based on the concept of partial waves

2019 ◽  
Vol 30 ◽  
pp. 07001
Author(s):  
Vladimir Biryukov ◽  
Vladimir Grachev ◽  
Ekaterina Karakozova ◽  
Sergey Lobin ◽  
Vladimir Shcherbakov
Keyword(s):  
Surface Roughness ◽  
Electromagnetic Wave ◽  
Rough Surface ◽  
Rectangular Waveguide ◽  
Unit Length ◽  
Surface Profile ◽  
Terahertz Frequency ◽  
Frequency Range ◽  
Terahertz Frequency Range ◽  
Surface Reflection

A method for calculating the rough surface reflection coefficient of an electromagnetic wave is proposed. It is shown that the screening surface roughness in waveguides is equivalent to a decrease in conductivity of these surfaces in comparison with values belonging to Schukin-Leontovich boundary conditions for completely smooth surfaces. Examples of calculating the attenuation coefficient in the rectangular waveguide with rough screening surfaces in a terahertz frequency range are presented. The influence of the size and shape of the rough surface profile irregularities on the waveguide attenuation is studied.

Sign in / Sign up

Export Citation Format

Share Document