Design of light weight wideband microwave absorber using ferromagnetic cobalt nanoparticles dispersed in polystyrene matrix for X-band applications

2016 ◽  
Author(s):  
Azizurrahaman Ansari ◽  
M Jaleel Akhtar
Keyword(s):  
Cobalt Nanoparticles ◽  
Microwave Absorber ◽  
Light Weight ◽  
X Band ◽  
Polystyrene Matrix ◽  
Ferromagnetic Cobalt

scholarly journals Metamaterial Microwave Absorber (MMA)) for Electromagnetic Interference (EMI)) Shielding in X-band

2021 ◽  
Author(s):  
Rakesh Mishra ◽  
Ravi Gupta ◽  
Suwarna Datar
Keyword(s):  
Electromagnetic Interference ◽  
Rotational Symmetry ◽  
Unit Cell ◽  
Microwave Absorber ◽  
Light Weight ◽  
Emi Shielding ◽  
S Parameter ◽  
X Band ◽  
Planar Array ◽  
High Absorption

Abstract The present paper is aimed at investigating application of planar Metamaterial (MM) structures for effective EMI Shielding and Stealth applications in X-Band. Various MM structures using FR4 substrate and Copper conductors were conceived and designed followed by simulations carried out using CST MWS Suite software. As a first step, the de- signs were aimed at achieving extremely high absorption for normal incidence, polarisation independence and maintaining high absorption in wide angle performance while keeping the requirement of light weight, flexibility and environmental ruggedness in mind for deployability on platforms to achieve effective stealth against Radars and for other EMI shielding applications. Circularly symmetric, single layer Metamaterial Microwave Absorber (MMA) design over thin FR4 substrate in spokes and wheel structural arrangement provided these desired features. The thin FR4 substrate of 0.6 mm provides the light weight and flexibility while absorbing the EM waves. Rotational symmetry of the spoke and cut-wheel design gives it polarisation independence and 4 ring planar array concept with rings scaled to different sizes in the same plane in the unit cell provided the increase in bandwidth. Reduction in received signal level of the echo is depicted by the S-Parameter at the input port. Getting values of this S-Parameter less than -60dB at resonant frequency for MMAs is highly encouraging and is not reported much in literature. Enhancement of nearly 3-8 times in operating bandwidth was achieved by changing size of rings in each quadrant in the co-planar array having four resonant rings in each unit cell.

scholarly journals Investigation on the Dielectric Properties of Pulverized Oil Palm Frond and Pineapple Leaf Fiber for X-Band Microwave Absorber Application

2014 ◽  
Vol 893 ◽  
pp. 488-491 ◽  
Author(s):  
Elfarizanis Baharudin ◽  
Alyani Ismail ◽  
Adam Reda Hasan Alhawari ◽  
Edi Syams Zainudin ◽  
Dayang L.A. Majid ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Oil Palm ◽  
Microwave Absorber ◽  
Band Frequency ◽  
Pineapple Leaf Fiber ◽  
X Band ◽  
Oil Palm Frond ◽  
Palm Frond ◽  
Leaf Fiber

This paper presents the results on dielectric properties of pulverized material based on agricultural waste namely oil palm frond and pineapple leaf fiber for microwave absorber application in the X-band frequency range. The investigation is started by identifying the pulverized materials permittivities and loss tangents using coaxial probe technique, followed by density measurement comprising the determination of bulk and solid densities. Then, by using dielectric mixture model, the solid particle dielectric properties were determined. It is observed that the air properties give quite an effect on the permittivity and loss tangent of the pulverized materials. It is also found that the lower the material density the higher material dielectric constant will be. Furthermore, the results show that, both oil palm frond and pineapple leaf fiber are potential to be X-band absorber with average dielectric constant of 4.40 and 3.38 respectively. The loss tangents for both materials were observed to be more than 0.1 which mark them as lossy materials.

Tuning of single to multi-domain behavior for monodispersed ferromagnetic cobalt nanoparticles

2008 ◽  
Vol 466 (4-6) ◽  
pp. 181-185 ◽  
Author(s):  
Namdeo S. Gajbhiye ◽  
Sachil Sharma ◽  
Arun K. Nigam ◽  
Raghumani S. Ningthoujam
Keyword(s):  
Cobalt Nanoparticles ◽  
Ferromagnetic Cobalt

scholarly journals Investigation on electromagnetic characteristics, microwave absorption, thermal and mechanical properties of ferromagnetic cobalt–polystyrene composites in the X-band (8.4–12.4 GHz)

RSC Advances ◽  
2016 ◽  
Vol 6 (17) ◽  
pp. 13846-13857 ◽  
Author(s):  
Azizurrahaman Ansari ◽  
Mohammad Jaleel Akhtar
Keyword(s):  
Mechanical Properties ◽  
Microwave Absorption ◽  
Wide Band ◽  
Thermal And Mechanical Properties ◽  
Microwave Absorbers ◽  
X Band ◽  
Electromagnetic Characteristics ◽  
Ferromagnetic Cobalt

The electromagnetic, thermal and mechanical properties of ferromagnetic cobalt–polystyrene composites in the X-band (8.4–12.4 GHz) are investigated in order to explore their usage for wide band microwave absorbers.

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