Comparison of Measured and Predicted Permittivity Values for 3D Printed PLA Substrates

Persad, Jeevan; Rocke, Sean

doi:10.1109/lamc50424.2021.9602057

Cited by 2 publications

(5 citation statements)

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“…From the example results listed in Table 1 it is observed that expression (7) does not hold for various discontinuities especially at the higher frequencies. Therefore, the 3DP dielectric substrates cannot be considered as homogenous.…”

Section: A Preparation Of 3dp Samplesmentioning

confidence: 99%

“…As stated previously, the permeability of the inclusion and matrix material are assumed to be 1. The frequency range of the applied signal is 1 GHz to 10 GHz which corresponds to a wavelength λ of 0.30 m to 0.03 m then: r the range of k 1 for 1 = 1.00 (air) is 20.94 m -1 to 209.44 m -1 r the range of k 2 for 2 = 2.75 (PLA) [34] is 34.73 m -1 to 347.32 m -1 Using the range of values for k 1 and k 2 the various discontinuities within the 3DP structure can be evaluated based on expression (7) to establish whether each discontinuity would impact the applied signal and must be considered by the mixture model. For this work, the various discontinuities ξ i of the 3DP materials were quantified using a microscope and is described later in this report.…”

Section: B Shape Factor Mixture Modelsmentioning

confidence: 99%

“…Finally, as stated previously, the discontinuities within the 3DP samples were measured in order to establish their size. The measured discontinuities were then evaluated using (7) to establish the state of homogeneity of the 3DP substrate. Fig.…”

Section: A Preparation Of 3dp Samplesmentioning

confidence: 99%

“…One example application area would be sensor design. In our previous work we have examined the impact of the variations of the substrate dielectric constant on the performance of a complementary split ring resonator (CSRR) topology for non-invasive blood glucose and creatine monitoring [7]. The performance parameters examined were the resonant frequency and reflection coefficient (S 11 ).…”

Section: A Details Of Infill Patterns and Measured Dielectric Constantmentioning

confidence: 99%

“…The identification/derivation of suitable mixture models which can allow for the accurate estimation of the EM properties of 3DP materials is necessary for the design and modeling of electrical structures which are intended to be manufacturing using 3D printing processes. The lack of accurate material modeling data can lead to wide variations between the designed and built application (for example a wearable sensor) leading to significant variation between the intended and actual performance of the device [7].…”

Section: Introductionmentioning

confidence: 99%

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Impact of 3D Printing Infill Patterns on the Effective Permittivity of 3D Printed Substrates

Persad,

Rocke

2024

IEEE J. Microw.

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3D printing can potentially transform traditional electronics manufacturing by allowing for the accurate direct digital manufacture of complex electronic structures with a much smaller process footprint. However, there are challenges which restrict the use of 3D printing for electronic manufacturing. One significant challenge is the characterization of the electromagnetic properties of the 3D printed materials such as their resultant dielectric permittivity. This work reports on the investigation of existing mixture models to establish their suitability for predicting the dielectric permittivity of 3D printed binary materials for the test frequency range of 1 GHz to 10 GHz. The identified models included volume fraction mixture models which considered the material volume concentration of the binary material and shape factor mixture models which consider the geometry and distribution of the mixture constituents. The fused filament fabrication 3D printing process was used for this work. 3D printed samples were produced with varying percentage volume compositions and varying infill patterns. The dielectric permittivity of the samples was investigated using the two-layer stripline measurement method and the measured data compared to the mixture model estimates. The shape factor mixture models were found to not be in good agreement with the measured values of dielectric permittivity. This result was attributed to the relatively small size of the discontinuities within the 3D printed substrate being insufficient to present anisotropy relative to the wavelength of the applied test signals. The volume fraction models were found to be in close agreement for samples with select infill patterns.INDEX TERMS Mixture models, 3D-printing, additive manufacturing, dielectrics, material characterization.This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination.

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Section: A Preparation Of 3dp Samplesmentioning

confidence: 99%

Section: B Shape Factor Mixture Modelsmentioning

confidence: 99%

Section: A Preparation Of 3dp Samplesmentioning

confidence: 99%

Section: A Details Of Infill Patterns and Measured Dielectric Constantmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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