scholarly journals Microwave Absorption Properties of Double-Layer RADAR Absorbing Materials Based on Doped Barium Hexaferrite/TiO2/Conducting Carbon Black

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Sukanta Das ◽  
G. C. Nayak ◽  
S. K. Sahu ◽  
P. C. Routray ◽  
A. K. Roy ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Carbon Black ◽  
Microwave Absorption ◽  
Double Layer ◽  
Reflection Loss ◽  
Barium Hexaferrite ◽  
Conducting Layer ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Absorbing Materials

In this report, we demonstrate microwave absorption properties of barium hexaferrite, doped barium hexaferrite, titanium dioxide and conducting carbon black based RADAR absorbing material for stealth application. Double-layer absorbers are prepared with a top layer consisting of 30% hexaferrite and 10% titanium dioxide while the bottom layer composed of 30% hexaferrite and 10% conducting carbon black, embedded in chloroprene matrix. The top and bottom layers are prepared as impedance matching layer and conducting layer, respectively, with a total thickness of 2 mm. Microwave absorption properties of all the composites were analyzed in X-band region. Maximum reflection loss of −32 dB at 10.64 GHz was observed for barium hexaferrite based double-layer absorber whereas for doped barium hexaferrite based absorber the reflection loss was found to be −29.56 dB at 11.7 GHz. A consistence reflection loss value (>−24 dB) was observed for doped barium hexaferrite based RADAR absorbing materials within the entire bandwidth.

Electromagnetic and Microwave Absorption of Nanocrystalline Alloy Fe0.2(Co0.2Ni0.8)0.8 and Nanocomposite SrFe12O19/Ni0.5Zn0.5Fe2O4 Microfibers

2014 ◽  
Vol 1035 ◽  
pp. 355-360
Author(s):  
Min Li ◽  
Zhou Wang ◽  
Hong Bo Liu ◽  
Xiang Qian Shen
Keyword(s):  
Microwave Absorption ◽  
Double Layer ◽  
Reflection Loss ◽  
Layer Structure ◽  
Nanocrystalline Alloy ◽  
Electromagnetic Parameter ◽  
Total Thickness ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Double Layer Structure

Magnetic nanocrystalline alloy Fe0.2(Co0.2Ni0.8)0.8 microfibers and nanocomposite SrFe12O19/Ni0.5Zn0.5Fe2O4 microfibers are used as the absorbents in the double-layer structure for microwave absorption. The double-layer absorbers with a total thickness of 2 mm consisting of Fe0.2(Co0.2Ni0.8)0.8 and nanocomposite SrFe12O19/Ni0.5Zn0.5Fe2O4 microfibers are designed, and their microwave absorption properties are predicted based on the electromagnetic parameter measurements. The results show that the double-layer absorber with the absorption layer of SrFe12O19/Ni0.5Zn0.5Fe2O4 microfibers and the thickness of 0.6 mm has the best microwave absorption properties, with the bandwidth ( the reflection loss less than −10 dB) of 7.3 GHz ranging from 10.7 GHz to 18 GHz, and the maximum reflection loss of −71.4 dB at 12.1 GHz.

Magnetization and Microwave Absorption Properties of La0.67 Sr0.33 MnO3 with Different Particle Size

2011 ◽  
Vol 374-377 ◽  
pp. 1541-1544 ◽  
Author(s):  
Yu Lan Cheng ◽  
Ping Xia ◽  
Ke Xiang Wei ◽  
Quan Bai
Keyword(s):  
Particle Size ◽  
Sinter Temperature ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Sol Gel ◽  
Frequency Range ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Measured Frequency Range ◽  
Maximum Reflection Loss

La 0.67 Sr 0.33 MnO 3 particles with different particle size have been prepared by sol-gel method. The structure, magnetization and microwave absorption properties have been investigated. The results show that the particle size can be controlled by sinter temperature. The peaks of the maximum reflection loss (RL) move to higher frequency regions with increasing particle size. The value of the maximum RL is -32 dB at 10.2GHz with a particle size of 58.5nm. The bandwidth with a RL exceeding -8dB reached 1.6GHz in the whole measured frequency range, suggesting that La 0.67 Sr 0.33 MnO 3 particles are promising for application as a wideband and strong absorption building microwave absorber.

scholarly journals Controlling the electric permittivity of honeycomb-like core–shell Ni/CuSiO3 composite nanospheres to enhance microwave absorption properties

RSC Advances ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 1172-1180 ◽  
Author(s):  
Rambabu Kuchi ◽  
Taha Latif ◽  
Sung Woo Lee ◽  
Viet Dongquoc ◽  
Phuoc Cao Van ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Impedance Matching ◽  
Core Shell ◽  
Electric Permittivity ◽  
Next Generation ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbing Materials ◽  
Absorbing Materials ◽  
Microwave Absorbing

Controlling impedance matching and enhancing absorption properties are crucial for developing next-generation microwave absorbing materials.

Large-Scale Synthesis and Microwave Absorption Properties of CoFe2O4/ Co0.4Zn0.6Fe2O4 Hollow Nanospheres

2015 ◽  
Vol 645-646 ◽  
pp. 126-131
Author(s):  
Qing Guo Ren ◽  
Xiao Jing Qiao ◽  
Yan Li ◽  
Zhi Gang Sun ◽  
Xiao Dang Guo ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
Large Scale ◽  
Average Diameter ◽  
Hollow Nanospheres ◽  
Magnetic Studies ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Line Theory ◽  
Glycol Solution

Monodisperse CoFe2O4and Co0.4Zn0.6Fe2O4hollow nanospheres were synthesized in large scale by solvothermal method in ethylene glycol solution. The structure, shape and size of the samples were investigated by Fourier Transform infrared, X-ray powder diffraction and scanning electron microscopy. The results indicate that the products are spherical with an average diameter less than 200 nm. Magnetic studies revealed that the saturation magnetization of Co0.4Zn0.6Fe2O4is 78.6 emu/g, higher than the CoFe2O4, which is 69 emu/g, while the coercivity of the Co0.4Zn0.6Fe2O4is 184 Oe , obviously lower than that of CoFe2O4which is 832 Oe. The electromagnetic parameters were measured at 2-18 GHz using HP8722ES vector network analyzer and then the microwave absorption properties were calculated through the transmission line theory. As to the Co0.4Zn0.6Fe2O4, the absorption bandwidth with reflection loss below-10 dB is up to 3GHz, from 10GHz to 13GHz with a thickness of 2 mm. A maximum reflection loss-45.6 dB was found at 12.9 GHz for the CoFe2O4with a thickness of 1.8 mm. As a result, the as-prepared hollow nanospheres show good prospects of being applied in EM wave absorption materials.

Temperature dependence of the electromagnetic and microwave absorption properties of polyimide/Ti3SiC2 composites in the X band

RSC Advances ◽  
2015 ◽  
Vol 5 (105) ◽  
pp. 86656-86664 ◽  
Author(s):  
Hongyu Wang ◽  
Dongmei Zhu ◽  
Wancheng Zhou ◽  
Fa Luo
Keyword(s):  
Temperature Dependence ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Absorption Bandwidth ◽  
X Band ◽  
Maximum Reflection Loss

The maximum reflection loss value of polyimide/Ti3SiC2 composites is up to −48.6 dB at 8.5 GHz with a thickness of 2.9 mm and the absorption bandwidth below −10 dB is 3.8 GHz.

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