A Stripline Width-Array Method for Determining a Causal Model for the Complex Permittivity

Chaparro-Ortiz, Dora A.; Torres‐Torres, Reydezel

doi:10.1109/lmwc.2020.3046221

Cited by 3 publications

(2 citation statements)

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“…The real part ε′ is related to the ability of the material to store electromagnetic waves and the imaginary part ε″ is related to the dissipation of electromagnetic waves by the material. The real part ε′ and the imaginary part ε″ can be calculated by Equations () and () 33 :

ε^{'} goodbreak= ε_{\infty} goodbreak+ \frac{ε_{s} - ε_{\infty}}{1 + j 2 italicπfτ}

ε^{″} goodbreak= \frac{2 italicπfτ ((), ε_{s} goodbreak- ε_{\infty})}{1 + {(2 πf)}^{2} τ^{2}}

where f ,

ε_{s},

ε_{\infty}

and

τ

are the frequency, static dielectric constant, relative dielectric constant and polarization relaxation time, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Preparation of polysiloxane foam with graphene for promoting electromagnetic interference shielding performance and thermal stability

Sima

Sui

Zhang

2022

J of Applied Polymer Sci

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Mechanical exfoliation of graphene (MEG) and reduced graphene oxide (RGO) are fabricated with using graphite and they are used as fillers to improve the electromagnetic interference (EMI) shielding performance and thermal stability of polysiloxane composite foam. Since graphene builds a conductive network in the matrix and at the same time enhances the impedance mismatch between the syntactic foam and the external free space, the total shielding effectiveness (SE total ) of the composite foam can reach up to 4.74 dB, which is 500% higher than that of pure foam. Moreover, the layered structure of graphene can restrict the small molecules generated during the foam pyrolysis process from leaving the system, and also increases the maximum decomposition temperature of the composite foam (increased from 431.8 to about 500 C), which improves the thermal stability of the foam. These results indicate that the combination of graphene in polysiloxane foams produces composite foams with multifunctional properties, suitable for applications requiring EMI shielding and thermal performance.

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ε^{'} goodbreak= ε_{\infty} goodbreak+ \frac{ε_{s} - ε_{\infty}}{1 + j 2 italicπfτ}

ε^{″} goodbreak= \frac{2 italicπfτ ((), ε_{s} goodbreak- ε_{\infty})}{1 + {(2 πf)}^{2} τ^{2}}

where f ,

ε_{s},

ε_{\infty}

and

τ

are the frequency, static dielectric constant, relative dielectric constant and polarization relaxation time, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The real part ε 0 is related to the ability of the material to store electromagnetic waves and the imaginary part ε 00 is related to the dissipation of electromagnetic waves by the material. The real part ε 0 and the imaginary part ε 00 can be calculated by Equations ( 4) and ( 5) 33 :…”

Section: Emi Shielding Properties Of Psf-based Compositesmentioning

confidence: 99%