Permittivity Determination Considering the Metal Surface Roughness Effect on the Microstrip Line Series Inductance and Shunt Capacitance

Teran-Bahena, Erika Y.; Sejas-Garcia, Svetlana C.; Torres‐Torres, Reydezel

doi:10.1109/tmtt.2020.2979964

Cited by 8 publications

(6 citation statements)

References 24 publications

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“…On the one hand, it will be necessary to determine losses in conductors. For this process, the analytical model presented in [34] and improved in [35], which includes the effect of surface roughness, will be used. Once these losses have been…”

Section: Estimation Of Materials Parametersmentioning

confidence: 99%

Parameters Characterization of Dielectric Materials Samples in Microwave and Millimeter-Wave Bands

Pérez-Escribano

Márquez-Segura

2021

IEEE Trans. Microwave Theory Techn.

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In this work, an optimized broadband method using multilayer transmission lines to characterize dielectric permittivity and loss tangent of material samples is presented. For this purpose, a microstrip line loaded with a piece of the selected dielectric to be characterized is used. From two-port measurements, and using different length lines, the propagation constant can be obtained. To minimize random errors and to improve the accuracy, an over determination of the method increasing the number of lines measured and a criteria to choose the optimal line lengths is considered. Firstly, the measurement method itself is applied to uncovered microstrip lines and an accurate model of the substrate is obtained. Secondly, the lines are covered with several materials, made by FDM additive manufacturing technique, such as Acrylonitrile Butadiene Styrene (ABS), Polylactic Acid (PLA), High Impact Polystyrene (HIPS), Thermoplastic Polyurethane (TPU), Copolyester (CPE), FLEX, Polyethylene Terephthalate Glycol (PETG) and Nylon. A model of the transmission line considering the cover is developed and an electromagnetic simulator is used to indirectly determine the cover material electrical parameters. Results show excellent agreement with electromagnetic simulations in the 0.1-to 67-GHz frequency band, so they assess the suitability of the proposed method.

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Section: Estimation Of Materials Parametersmentioning

confidence: 99%

Parameters Characterization of Dielectric Materials Samples in Microwave and Millimeter-Wave Bands

Pérez-Escribano

Márquez-Segura

2021

IEEE Trans. Microwave Theory Techn.

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“…The transmission signal loss in PCBs is influenced by a variety of factors, including the conductor and dielectric losses of materials, [5,24,25] the resistance of transmission lines, [26] and the surface roughness. [27] In this context, the primary focus is on the signal transmission loss of PCBs specifically related to surface roughness. [28] Figure 3 provides a clear illustration of the insertion loss experienced by conductive lines subjected to both brown oxidation and anodized oxidation.…”

Section: Insertion Lossmentioning

confidence: 99%

An Enhanced Interlayer Construction Strategy for High‐Frequency Copper Clad Laminates: Resolving the Contradiction between Signal Loss and Adhesion

Mei,

Yang,

Lei

et al. 2023

Adv Materials Technologies

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In high‐frequency printed circuit boards (PCBs), there is an inherent contradiction between minimizing signal loss and maximizing adhesion strength. To tackle this issue, this work presents a simple approach by developing an enhanced interlayer through a two‐step process involving anodization/APTES (3‐aminopropyltriethoxysilane) treatment. The anodization yields micro/nano oxide structures with low surface roughness, thereby reducing the skin effect. One side of the enhanced interlayer is mechanically anchored and chemically bonded to copper foils, while the other side is coupled with bismaleimide/triazine‐based resins (BT resins), significantly augmenting the adhesion strength. Eight‐layer PCBs manufactured employing this method exhibit an insertion loss of −1.3553 dB in−1 at 32 GHz. Compared to two conventional brown oxide methods, the insertion loss is reduced by 7.80% and 3.24%, respectively, with a more substantial reduction observed at higher frequencies. The peel strength of samples ranges from 0.554 to 0.589 N mm−1, demonstrating maximum enhancements of 34.78% and 164.13% in comparison to the two brown oxide methods, respectively. Moreover, eight‐layer PCBs undergo lead‐free reflow soldering tests, solder float tests, and thermal fatigue tests without encountering any failures. Consequently, the proposed method holds significant practical significance in addressing the challenge associated with low signal loss and high adhesion strength in high‐frequency PCBs.

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“…where we used I d /I e = U d /U e . In the case of ω(C 10 + C d )R d 1, Equation (18) simplifies to:…”

Section: Measurements Of Conductance Of Liquidsmentioning

confidence: 99%

“…There are many different permittivity measurement methods, each having its advantages and drawbacks. These methods are classified into a few common types, including resonant cavity [11][12][13], coaxial probe [8,14,15], transmission line [16][17][18] and parallel plate capacitor [19][20][21][22]. In [23][24][25], a microwave resonator is calibrated with materials of known dielectric properties, usually with organic solvents such as methanol, ethanol, etc.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity and Accuracy of Dielectric Measurements of Liquids Significantly Improved by Coupled Capacitive-Dependent Quartz Crystals

Matko

Milanovič

2021

Sensors

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A method to measure complex permittivity of liquids by using a capacitive-dependent quartz crystal and two quartz oscillators for temperature compensation in the frequency range of 4–10 MHz is described. Complex permittivity can be detected with high precision and sensitivity through a small change of capacitance and conductance, because a change in reactance in series with the quartz crystal impacts its resonant oscillation frequency. The temperature compensation in the range below 0.1 ppm is achieved by using two quartz oscillators that are made of elements of the same quality and have a temperature–frequency pair of quartz crystals. With the help of a reference oscillator, measurements of frequency are more accurate, because the frequency difference is in the kHz region, which also enables further processing of the signal by a microcontroller. With a proper calibration, the accuracy of this highly sensitive quartz crystal method is ±0.05%, which is an order of magnitude lower than that for a capacitance method without quartz crystals. The improved accuracy is of significant importance in the field of power engineering to monitor coolants and lubricants, oils, liquid fuels and other liquids, the dielectric properties of which are crucial for proper operation of devices.

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Permittivity Determination Considering the Metal Surface Roughness Effect on the Microstrip Line Series Inductance and Shunt Capacitance

Cited by 8 publications

References 24 publications

Parameters Characterization of Dielectric Materials Samples in Microwave and Millimeter-Wave Bands

Parameters Characterization of Dielectric Materials Samples in Microwave and Millimeter-Wave Bands

An Enhanced Interlayer Construction Strategy for High‐Frequency Copper Clad Laminates: Resolving the Contradiction between Signal Loss and Adhesion

Sensitivity and Accuracy of Dielectric Measurements of Liquids Significantly Improved by Coupled Capacitive-Dependent Quartz Crystals

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