Determining factors for high performance silicone rubber microwave absorbing materials

Zou, Hua; Li, Shuhuan; Zhang, Liqun; Yan, Shaohua; Wu, Hanguang; Zhang, Shuai; Tian, Ming

doi:10.1016/j.jmmm.2011.01.028

Cited by 36 publications

(11 citation statements)

References 16 publications

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“…Research and design of MAMs have become essential for effective elimination of EMR and EMI in the given range of frequencies. Typically, MAMs are usually composite materials with dielectric, conductive, and/or magnetic particles embedded in a polymer matrix [4,5]. The efficiency of MAMs depends on many factors, such as conductivity, complex permittivity (ε r = ε − jε ) and complex permeability ( r = − j ).…”

Section: Introductionmentioning

confidence: 99%

Preparation, characterization and microwave absorbing properties of FeNi alloy prepared by gas atomization method

Feng¹,

Qiu²

2012

Journal of Alloys and Compounds

135

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Section: Introductionmentioning

confidence: 99%

Preparation, characterization and microwave absorbing properties of FeNi alloy prepared by gas atomization method

Feng¹,

Qiu²

2012

Journal of Alloys and Compounds

135

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“…The RL for sample P 0 is low for all the frequencies with a minimum value of RL −2.33 dB at 10.384 GHz. The RL is evidently improved to a minimum value of −12.46 dB at 10.55 GHz for P 1 with a bandwidth of 2.18 GHz, where the bandwidth is defined as the frequency width, in which the reflection loss is less than −10 dB (corresponding to 90% absorption) [25]. The values of minimum reflection losses are −15.71 dB for P 2 at 9.96 GHz and −20.21 for P 3 at 9.46 GHz and −10 dB bandwidths are 2.86 and 3.02 GHz respectively.…”

Section: Reflection Loss Studymentioning

confidence: 97%

EFFECT OF PARTICLE SIZE OF BaFe<sub>12</sub>O<sub>19</sub> ON THE MICROWAVE ABSORPTION CHARACTERISTICS IN X-BAND

Kumar¹,

Agarwala²,

Singh³

2013

PIER M

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Abstract-Present work deals with the microwave absorption characteristics of BaFe 12 O 19 of interest as radar absorbing material (RAM). There are very few reported works available where particle size has been critically analyzed for absorbing characteristics at microwave frequencies, therefore, in this paper microwave absorption properties of the BaFe 12 O 19 with different particle sizes were investigated. The results showed that the particle size had significant influence on the dielectric and absorption properties of the composites in the 8.2-12.4 GHz frequency range. BaFe 12 O 19 powder of different particle sizes were synthesized by varying the annealing time and it was observed that the real part of permittivity of the composite increases from 5.18 (average value) to 7.50 (average value) and imaginary part increases from an average value of 0.20 to an average value of 2.33, whereas the real part of permeability increases from 0.95 (average value) to 1.11 (average value) and imaginary part of permeability was measured in the range of 0.02 to 0.07. These changes in permittivity and permeability affects microwave absorption application. It is observed that the maximum bandwidth for average particle size of 240 nm is 3.02 GHz and with the increase in average particle size, microwave absorption properties increased.

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“…In order to study the influence of polyaniline on the microwave absorbing property, the reflection losses (RL) of the pure barium ferrite (BF) and PANI/BF composites (S1, S3, S5 and S7) were investigated in the frequency range of 2-18 GHz. According to the transmission line theory, reflection loss (RL) is a function of the reflection coefficient and can be expressed as follows [31]: Where Z 0 is the impedance in free space, Z in refers to the normalized input impedance and can be given by the expression:…”

Section: Microwave Absorption Propertiesmentioning

confidence: 99%

Polyaniline containing W-type hexaferrite composites for microwave absorption in high-frequency applications

Guo

et al. 2015

J Polym Res

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The W-type hexaferrite Ba 0.85 La 0.15 Co 2 Fe 16 O 27 composite with polyaniline was synthesized by a facile route of in-situ chemical oxidative polymerization. This n o v e l o r g a n i c -i n o r g a n i c c o m p o s i t e m a t e r i a l (PANI/Ba 0.85 La 0.15 Co 2 Fe 16 O 27 ) can be used as a potential microwave absorber. And their microstructure, static magnetization, complex permittivity, permeability and microwave absorbing properties were subsequently investigated. Compared with pure W-type hexagonal ferrite, the composites have higher permittivity and reflection loss, which gradually increase with the increase of PANI content. The excellent microwave absorption in our experiment reached to −14.95 dB at 9.3 GHz with the layer thickness of 4 mm when the mass ratio was 0.7/0.5. More importantly, well reflection loss over a wide frequency range can be achieved by manipulating the content of PANI. The results indicated that the novel organic-inorganic materials composed of polyaniline and W-type hexagonal ferrite had an excellent microwave absorption property, and may be used as lightweight and highly effective microwave absorbers.

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Determining factors for high performance silicone rubber microwave absorbing materials

Cited by 36 publications

References 16 publications

Preparation, characterization and microwave absorbing properties of FeNi alloy prepared by gas atomization method

Preparation, characterization and microwave absorbing properties of FeNi alloy prepared by gas atomization method

EFFECT OF PARTICLE SIZE OF BaFe<sub>12</sub>O<sub>19</sub> ON THE MICROWAVE ABSORPTION CHARACTERISTICS IN X-BAND

Polyaniline containing W-type hexaferrite composites for microwave absorption in high-frequency applications

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