Microwave Properties of Sandwich Structure Based on Iron and Barium Nanoparticles

2009 ◽  
Vol 152-153 ◽  
pp. 337-340
Author(s):  
A.V. Babushkin
Keyword(s):  
High Frequency ◽  
Sandwich Structure ◽  
Effective Permeability ◽  
Skin Effect ◽  
Effective Medium Theory ◽  
Microwave Properties ◽  
Medium Theory ◽  
Magnetic Components ◽  
Damping Parameter ◽  
Nonmagnetic Matrix

The high frequency intrinsic and effective permeability was calculated for spherical iron and barium particles in a nonmagnetic matrix (epoxy resin) by using the combination of Landau-Lifshitz-Gilbert equation and extended Bruggeman’s effective medium theory with the consideration of the skin effect. It was found that the microwave properties of the composite were influenced by many parameters, such as damping parameter, volume fractions and size of magnetic components. The sandwich microwave absorber with reflection loss < −10 dB over the range of 6-22 GHz was achieved. The thickness of absorber is only 4.25 mm.

Effective Medium Theory of Dielectric Constant of Granular Materials in the Presence of Skin Effect

1990 ◽  
Vol 195 ◽  
Author(s):  
L.V. Panina ◽  
A.N. Lagar´kov ◽  
A. Ќ Sarychev ◽  
Y.R. Smychkovich ◽  
A.P. Vinogradov
Keyword(s):  
Dielectric Constant ◽  
Composite Material ◽  
Percolation Threshold ◽  
Granular Materials ◽  
Skin Effect ◽  
Effective Medium Theory ◽  
Critical Concentration ◽  
Medium Theory ◽  
Composite Systems ◽  
Conducting Component

We consider the behavior of the dielectric constant of percolation composite systems. An example of such systems is a composite material consisting of a disordered mixture of metallic and insulating particles. A reduction in concentration P of the metallic (conducting) component reduces the static conductivity of the composite, so that it vanishes at some critical concentration PC known as the percolation threshold.

Effective permeability tensor of partially magnetized two-component metaferrites

2014 ◽  
Vol 28 (25) ◽  
pp. 1450199 ◽  
Author(s):  
Oleg Rybin
Keyword(s):  
Effective Permeability ◽  
Effective Medium Theory ◽  
Microwave Frequency ◽  
Dielectric Medium ◽  
Permeability Tensor ◽  
Medium Theory ◽  
External Bias ◽  
Low Field ◽  
Two Component ◽  
Loss Term

Expressions for the effective permeability tensor of two-component partially magnetized ferrite-like metamaterials are obtained in the microwave frequency range. The formulas are based on the theory of partially saturated conventional ferrites and the effective medium theory (EMT) of metamaterials presented in a form of an infinite host dielectric medium with periodically embedded ferric cylindrical and spherical inclusions partially magnetized with an external bias DC magnetic field. The low-field losses absence conditions are obtained for the metamaterials under the assumption of a low phenomenological loss term and losses are estimated.

Usability of Effective Medium Model for Microwave Absorbing Ceramics

2013 ◽  
Vol 544 ◽  
pp. 485-488
Author(s):  
Zhao Yang Zeng ◽  
Heng Liu ◽  
Yi Min Guo
Keyword(s):  
Effective Medium Theory ◽  
Effective Medium ◽  
Measured Data ◽  
Microwave Properties ◽  
Medium Theory ◽  
Effective Medium Model ◽  
Medium Model ◽  
Microwave Absorbing

For the purpose of describing the microwave properties of microwave absorbing ceramics, the usability of effective-medium theory for this kind of materials was investigated. Different equations deduced from effective-medium theory were first discussed and then compared with the measured data of microwave absorbing sample. It was found that the theory could not explain the measured data well only if some empirical exponent were used.

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