Characterisation of dielectric 3D-printingmaterials at microwave frequencies

Alimenti, Andrea; Torokhtii, Kostiantyn; Pompeo, Nicola; Piuzzi, Emanuele; Silva, Enrico

doi:10.21014/acta_imeko.v9i3.778

Cited by 12 publications

(20 citation statements)

References 16 publications

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“…r , the e.m. field configuration inside the resonator can be computed, as well as all the geometrical and filling factors, either analytically or through e.m. simulations, as done in this work. Then, it is possible to demonstrate [2], [13], [36] that:…”

Section: A the Measurement Methodsmentioning

confidence: 99%

“…Due to the high e.m. losses of the materials under investigation, the best measurement sensitivity to the material εr is obtained limiting the volume of the dielectric sample in order to avoid a detrimental lowering of the fixture quality factor Q. A preliminary study focused on the optimization of the sample volume as a function of both ε ′ r and ε ′′ r of the sample itself was shown in [13].…”

Section: Introductionmentioning

confidence: 99%

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A Dielectric Loaded Resonator for the Measurement of the Complex Permittivity of Dielectric Substrates

Alimenti

Pittella

Torokhtii

et al. 2023

IEEE Trans. Instrum. Meas.

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A new configuration of dielectric loaded resonator, particularly versatile for the complex permittivity measurement of substrates for microwave circuits, even in presence of back metal plates, is here shown. In order to test this technique in a wide interval of the values of the complex permittivity, the versatility of 3D-printing is exploited to print samples with different densities, thus artificially changing the effective permittivity in the interval (1.7-3.1) for the real part and (0.02-0.06) for the imaginary part. The designed resonator, tuned at ∼ 12 GHz is experimentally validated by the comparison of measurements obtained on these samples with a split ring resonator and standard transmission/reflection waveguide methods. Then, the versatility of the designed resonator is shown on the characterization of FR4-fiberglass and Kapton ® polyimide samples.

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Section: A the Measurement Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Dielectric Loaded Resonator for the Measurement of the Complex Permittivity of Dielectric Substrates

Alimenti

Pittella

Torokhtii

et al. 2023

IEEE Trans. Instrum. Meas.

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“…Finally, an experimental validation of the measurement accuracy of the new DR configuration on

was shown in [ 62 ], comparing the

measurements obtained with this resonant set-up and with a transmission/reflection standard technique based on the so-called “NIST-precision” method [ 63 ], which is an improved version of the Nicholson–Ross–Weir, and using a WR90 waveguide. With this set-up, we obtained

[ 62 ], which is fairly in agreement with the here shown value measured on the full sample

.…”

Section: Experimental Tests and Performances Analysismentioning

confidence: 99%

“…We recently proposed the use of this DR as a contactless surface roughness measurement fixture [ 83 ], taking advantage of the high measurement repeatability. For what concerns its use for the characterization of dielectric materials, we previously showed a preliminary optimization of the fixture in [ 62 ], which was then adapted to the configuration here presented, that was more extensively tested in this paper.…”

Section: Comparison With the State Of The Artmentioning

confidence: 99%

Design and Test of a New Dielectric-Loaded Resonator for the Accurate Characterization of Conductive and Dielectric Materials

Alimenti

Torokhtii

García

et al. 2023

Sensors

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The spread of additive manufacturing techniques in the prototyping and realization of high-frequency applications renewed the interest in the characterization of the electromagnetic properties of both dielectric and conductive materials, as well as the design of new versatile measurement techniques. In this framework, a new configuration of a dielectric-loaded resonator is presented. Its optimization, realization, and use are presented. A measurement repeatability of about one order of magnitude lower than the commonly found values (10−3 on the Q-factor and 15×10−6 on the resonance frequency, given in terms of the relative standard deviations of repeated measurements) was reached thanks to the design of a closed resonator in which the samples can be loaded without disassembling the whole measurement fixture. The uncertainty levels, the ease of use, and the versatility of the realized system make its use of potential interest in numerous scenarios.

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“…In this context, microwave devices are considered as an attractive solution thanks to their interesting features in terms of cost, power consumption, and response time. They have been employed for materials characterization [11]- [13] as well as for gas sensing applications [14].…”

Section: Introductionmentioning

confidence: 99%

On the design and characterisation of a microwave microstrip resonator for gas sensing applications

et al. 2021

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This study focuses on the microwave characterisation of a microstrip resonator aimed for gas sensing applications. The developed one-port microstrip resonator, consisting of three concentric rings with a central disk, is coupled to a 50-Ohm microstrip feedline through a small gap. A humidity sensing layer is deposited on this gap by drop-coating an aqueous solution of Ag@alpha-Fe2O3 nanocomposite. The operation principle of the developed humidity sensor is based on the change of the dielectric properties of the Ag@alpha-Fe2O3 nanocomposite when the relative humidity is varied. However, it should be underlined that, depending on the choice of the sensing material, different target gases of interest can be detected with the proposed structure. The frequency-dependent response of the sensor is obtained using the reflection coefficient measured from 3.5 GHz to 5.6 GHz with relative humidity ranging from 0 %rh to 83 %rh. The variation of the humidity concentration strongly impacts on the two resonances detected in the measured reflection coefficient. In particular, an increase of the humidity level leads to lowering both resonant frequencies, which can be used as sensing parameters for humidity monitoring purpose. An exponential function has been used to accurately model the two resonant frequencies as a function of the humidity.

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Characterisation of dielectric 3D-printingmaterials at microwave frequencies

Cited by 12 publications

References 16 publications

A Dielectric Loaded Resonator for the Measurement of the Complex Permittivity of Dielectric Substrates

A Dielectric Loaded Resonator for the Measurement of the Complex Permittivity of Dielectric Substrates

Design and Test of a New Dielectric-Loaded Resonator for the Accurate Characterization of Conductive and Dielectric Materials

On the design and characterisation of a microwave microstrip resonator for gas sensing applications

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