ZrTi2O6 filled PTFE composites for microwave substrate applications

Wu, Kaituo; Yuan, Ying; Zhang, Shuren; Yan, Xiangyu; Yuren, Cui

doi:10.1007/s10965-013-0223-4

Cited by 38 publications

(9 citation statements)

References 24 publications

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“…Overall, the evidence shows that the Lichtenecker model is as effective as, or more effective than, the Maxwell-Garnett equation for predicting the permittivity of multiphase media (Wu et al, 2013;Kiley et al, 2012;Goncharenko et al, 2000). Other models for estimating the complex permittivity of porous materials have been presented by Jones and Friedman (2000) and Kelleners and Verma (2010).…”

Section: Theorymentioning

confidence: 98%

“…However, these models rely on parameters that are difficult to measure or estimate for real soils and therefore are difficult to apply. As pointed out by Neelakantaswamy et al (1985), the Lichtenecker equation has prevailed because it works well for data from soils across a wide range of materials and applications (Wu et al, 2013;Gnusin et al, 2009;Yang et al, 2009;Batsanov et al, 2008;Chao et al, 2008;Zheng et al, 2005;Roth et al, 1990).…”

Section: Theorymentioning

confidence: 99%

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Evaluation of Lichtenecker’s Mixing Model for Predicting Effective Permittivitty of Soils at 50 MHz

2015

Trans. ASABE

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Mixing models help describe the contribution of liquid, gas, and solid phases to the bulk dielectric permittivity of porous materials. They are particularly useful when studying the electromagnetic properties of the vadose zone using TDR or GPR techniques. The objective of this research was to evaluate the Lichtenecker Mixing Model applied to undisturbed and repacked soil data collected with a 50 MHz impedance sensor. These data along with four different applications of the Lichtenecker Mixing Model were used to predict the α parameter and/or solid phase permittivity. The four models employed were: (1) the Complex Refractive Index Model, α = 0.5 (CRIM); (2) dual varying of both α and solid phase permittivity (LI); (3) the direct-weighted average model, α = 1 (DW); and (4) a two-phase simplification of the Lichtenecker model (TM). Overall, the CRIM, LI, and TM models estimated the solid phase permittivity, α, and soil bulk permittivity within the ranges previously reported in the scientific literature, while the other model proved to be of little practical value. Further validation with glass beads showed that the simple CRIM model was the best predictor for soil bulk permittivity when compared to the two-parameter LI model. A regression model was also developed that accurately predicted the volumetric water content of glass beads from soil bulk permittivity, solid phase permittivity, and porosity.

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Section: Theorymentioning

confidence: 98%

Section: Theorymentioning

confidence: 99%

Evaluation of Lichtenecker’s Mixing Model for Predicting Effective Permittivitty of Soils at 50 MHz

2015

Trans. ASABE

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“…The dielectric properties of the substrate composites depend on not only the dielectric properties of the components but also other factors such as the size of fillers, the interactions between ceramics and polymers, and the dispersion of fillers in polymer matrix [9] [10] [11] [12] [13]. Figure 5 shows the dielectric constant and loss tangent of the composites as a function of D50 of TiO 2 particle size.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

The Effects of TiO2 Particle Size on the Properties of PTFE/TiO2 Composites

Luo¹,

Yuan²,

Tang³

et al. 2017

MSCE

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TiO 2 filled polytetrafluoroethylene (PTFE) composite were fabricated for microwave circuit applications. PTFE/TiO 2 composites were prepared by cold pressing and hot treating. The particle size of TiO 2 varied from 5 μm to 11 μm.TiO 2 powders with different sizes were prepared by the solid state ceramic route. The effects of TiO 2 particle size on the microstructure, density, moisture absorption, thermal conductivity and microwave dielectric properties of PTFE/TiO 2 composites were investigated. The density showed an increasing trend as the TiO 2 particle size increased, while the dielectric loss (tanδ) and moisture absorption decreased with the increase of TiO 2 particle size. The dielectric constant (εr) and thermal conductivity (λ) decreased up to D 50 = 6.5 μm and then sharply increased. Good properties with values of εr = 6.8, tanδ = 0.0012 and λ = 0.533 W•m −1 •K −1 were obtained in PTFE/TiO 2 composites when the particle size of TiO 2 was 11 μm.

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“…The dielectric properties of the substrate composites depend on not only the dielectric properties of the components but also other factors such as the interactions between ceramics and polymers, the size of fillers, and the dispersion of fillers in polymer matrix [8] [9] [10]. Figure 6 shows the dielectric constant and dielectric loss of the composites as a function of CaTiO 3 loading percent.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Effects of CaTiO3 Loading on the Properties of PTFE/TiO2 Composites

Tang¹,

Luo²,

Zhou³

et al. 2017

MSCE

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In this paper, a detailed study was carried out on the PTFE reinforced with TiO 2 and CaTiO 3 . The filler content of ceramic powder was a fixed value of 61 wt% and the content of CaTiO 3 in PTFE matrix varied from 0 wt% to 16 wt% with a step size of 4 wt%. The effects of CaTiO 3 loading on the density, moisture absorption, thermal expansion, microstructure and microwave dielectric properties were investigated. As CaTiO 3 loading content increased from 0 wt% to 16 wt%, the thermal expansion initially displayed a sharp increase, and showed a slight enhancement when the content of CaTiO 3 exceeded 12 wt%. The density experienced a continuous decrease with the addition of CaTiO 3 . The moisture absorption displayed a steady increase with the increasing Ca-TiO 3 loading amount. The changing of dielectric constant (εr) and loss tangent (tanδ) were similar to that of the moisture absorption in a manner. Good dielectric properties with values of εr = 11.60, tanδ = 0.002 were obtained in the PTFE matrix with 16 wt% CaTiO 3 and 45 wt% TiO 2 .

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ZrTi2O6 filled PTFE composites for microwave substrate applications

Cited by 38 publications

References 24 publications

Evaluation of Lichtenecker’s Mixing Model for Predicting Effective Permittivitty of Soils at 50 MHz

Evaluation of Lichtenecker’s Mixing Model for Predicting Effective Permittivitty of Soils at 50 MHz

The Effects of TiO2 Particle Size on the Properties of PTFE/TiO2 Composites

Effects of CaTiO3 Loading on the Properties of PTFE/TiO2 Composites

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