scholarly journals THE USE OF DIELECTRIC MIXTURE EQUATIONS TO ANALYZE THE DIELECTRIC PROPERTIES OF A MIXTURE OF RUBBER TIRE DUST AND RICE HUSKS IN A MICROWAVE ABSORBER

2012 ◽  
Vol 129 ◽  
pp. 559-578 ◽  
Author(s):  
Ee Meng Cheng ◽  
Mohd Fareq bin Abd Malek ◽  
Manjur Ahmed ◽  
Kok Yeow You ◽  
Kim Yee Lee ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Microwave Absorber ◽  
Rice Husks ◽  
Dielectric Mixture ◽  
Rubber Tire

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.

scholarly journals RUBBER TIRE DUST-RICE HUSK PYRAMIDAL MICROWAVE ABSORBER

2011 ◽  
Vol 117 ◽  
pp. 449-477 ◽  
Author(s):  
Mohd Fareq Bin Abd Malek ◽  
Ee Meng Cheng ◽  
O. Nadiah ◽  
Hassan Nornikman ◽  
Manjur Ahmed ◽  
...  
Keyword(s):  
Rice Husk ◽  
Microwave Absorber ◽  
Rubber Tire

scholarly journals Mixing Formulae and Experimental Results for the Dielectric Constant of Snow

1985 ◽  
Vol 31 (108) ◽  
pp. 163-170 ◽  
Author(s):  
Ari Sihvola ◽  
Ebbe Nyfors ◽  
Martti Tiuri
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Liquid Water ◽  
Complex Permittivity ◽  
Experimental Results ◽  
Exponential Models ◽  
Dielectric Mixture ◽  
Excess Permittivity ◽  
Wet Snow ◽  
Mixture Theories

AbstractThis paper discusses dielectric properties of snow according to various dielectric models and compares them with experimental results. The complex permittivity of wet snow is assumed to consist of two parts, being the sum of the permittivity of dry snow (a mixture of ice and air) and the excess permittivity due to liquid water (resulting from the dielectric mixture of water and air). In particular the effect of liquid water is considered. Exponential models and structure-dependent models based on mixture theories by Taylor and Tinga and others are applied. It is shown that the assumption that water inclusions have the form of either randomly oriented discs or needles, or of spheres do, not get empirical confirmation but the inclusions are preferably prolate ellipsoids (ellipticity 0.16) or oblate ellipsoids (ellipticity 0.12), dry snow being a dielectric mixture of randomly oriented disc-shaped ice particles and air.

Product design from waste: A novel eco-efficient pyramidal microwave absorber using rice husks and medium density fibreboard residues

2021 ◽  
Vol 119 ◽  
pp. 91-100
Author(s):  
Carlos Fernando Jung ◽  
Diego Augusto de Jesus Pacheco ◽  
Frederico Sporket ◽  
Carlos Augusto do Nascimento ◽  
Carla Schwengber ten Caten
Keyword(s):  
Product Design ◽  
Microwave Absorber ◽  
Medium Density ◽  
Rice Husks ◽  
Medium Density Fibreboard

Mixing Formulae and Experimental Results for the Dielectric Constant of Snow

1985 ◽  
Vol 31 (108) ◽  
pp. 163-170 ◽  
Author(s):  
Ari Sihvola ◽  
Ebbe Nyfors ◽  
Martti Tiuri
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Liquid Water ◽  
Complex Permittivity ◽  
Experimental Results ◽  
Exponential Models ◽  
Dielectric Mixture ◽  
Excess Permittivity ◽  
Wet Snow ◽  
Mixture Theories

Abstract This paper discusses dielectric properties of snow according to various dielectric models and compares them with experimental results. The complex permittivity of wet snow is assumed to consist of two parts, being the sum of the permittivity of dry snow (a mixture of ice and air) and the excess permittivity due to liquid water (resulting from the dielectric mixture of water and air). In particular the effect of liquid water is considered. Exponential models and structure-dependent models based on mixture theories by Taylor and Tinga and others are applied. It is shown that the assumption that water inclusions have the form of either randomly oriented discs or needles, or of spheres do, not get empirical confirmation but the inclusions are preferably prolate ellipsoids (ellipticity 0.16) or oblate ellipsoids (ellipticity 0.12), dry snow being a dielectric mixture of randomly oriented disc-shaped ice particles and air.

scholarly journals Single-layer performance of sugarcane bagasse- and rubber tire dust microwave absorber in narrow band frequency of 3.85 GHz to 8.2 GHz

2019 ◽  
Vol 13 (2) ◽  
pp. 737
Author(s):  
L. Zahid ◽  
M. Jusoh ◽  
N. H. Ghazali ◽  
Sabapathy Sabapathy ◽  
M. Mustapa ◽  
...  
Keyword(s):  
Sugarcane Bagasse ◽  
Unit Length ◽  
Single Layer ◽  
Microwave Absorber ◽  
Band Frequency ◽  
Weight Percentage ◽  
High Loss ◽  
Low Dielectric ◽  
Rubber Tire ◽  
Better Than

<span>In this paper, the single and flat layer of microwave absorber has been fabricated with different weight percentage of sugarcane bagasse (SCB) and rubber tire dust (RTD). The dielectric properties and wave propagation have been investigated in this work. There are two different designs in developing this layer of microwave absorber. In this work, the targeted frequency is within 3.85 GHz to 8.2 GHz. The preference was based on the fact that our goal was to achieve minimum backward reflections, and the sugarcane bagasse material, with its low dielectric constant, high loss factor, large attenuation per unit length, and ease of fabrication, provided a better opportunity to achieve that goal which is better than -10dB (90 % of absorption).</span>

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