1 to 220 GHz Complex Permittivity Behavior of Flexible Polydimethylsiloxane Substrate

Cresson, P.; Orlic, Yovan; Legier, Jean-François; Paleczny, E.; Dubois, L.; Tiercelin, Nicolas; Coquet, Philippe; Pernod, Philippe; Lasri, T.

doi:10.1109/lmwc.2013.2295230

Cited by 32 publications

(15 citation statements)

References 11 publications

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“…Importantly, impedance-based measurements may help to estimate the PDMS thickness (if the PDMS dielectric constant or conductivity is known) or its dielectric constant or conductivity (if the thickness is known), which are often crucial parameters. For instance, the PDMS dielectric constant can be important for stretchable dielectrics, dielectric elastomer actuators, phantoms for medical imaging, triboelectric nanogenerators, , and transmission lines . Moreover, the dielectric constant depends on the composition ,, and, for instance, in the case of PDMS, can be increased by more than 1 order of magnitude by the introduction of silver and nickel nanoparticles .…”

Section: Resultsmentioning

confidence: 99%

Thin PDMS-on-Sacrificial-PCB Devices

Pezzilli

Prestopino

Montoya

et al. 2022

ACS Appl. Electron. Mater.

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Poly(dimethylsiloxane) (PDMS) devices must often be so thin (e.g., <100 μm) and, therefore, so fragile that their mechanical release becomes challenging. As a simple solution, PDMS devices are frequently released by dissolving an underlying sacrificial resist. However, there may be several other issues, including temperature gradients during fabrication, electrical characterization, handling, co-integration with electronics, fabrication time, and cost. Here, we show that conventional printed circuit boards (PCBs) can be ideal sacrificial carriers, which can also perform useful functions during fabrication. The thick (e.g., 35 μm) and thermally conductive PCB copper layer behaves as an excellent heat spreading plate during temperature-sensitive process steps (e.g., PDMS curing and sintering of conductive inks) and enables pre-release electrical stimulations and characterizations of PDMS, which may help during process development. Experiments and finite element method (FEM) simulations confirm that the PCB copper layer can improve temperature uniformity. The UV-protecting film attached to the PCB can be cut to constitute a frame for easy handling. The PCB photoresist enables the straightforward release of PDMS by acetone, which is among the most environmentally friendly chemicals. Contacts can be opened by a simple bump-cut-peel strategy. As proofs of concept, we demonstrate pre-release capacitive characterization of PDMS for evaluating the ability to fabricate thin, but uniform and robust devices and post-release resistive characterization of stretchable strain sensor or interconnects encapsulated in PDMS. The proposed approach is simple, cheap, and environmentally friendly, can improve temperature uniformity throughout the pre-release process steps, enables pre-release electrical characterizations, can simplify co-integration with electronics and can be generalized to other elastomers.

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Section: Resultsmentioning

confidence: 99%

Thin PDMS-on-Sacrificial-PCB Devices

Pezzilli

Prestopino

Montoya

et al. 2022

ACS Appl. Electron. Mater.

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“…The 50‐Ω, 50‐mm‐long microstrip transmission line was fabricated on 0.787‐mm‐thick Rogers RT/Duroid ® substrate with ɛ r = 2.2. The microfluidic channel was made of polydimethylsiloxane (PDMS), a flexible silicone elastomer with a reported ɛ r from ∼2.95 at 50 MHz to ∼2.74 at 20 GHz [15]. The PDMS was bonded to the surface of the device using epoxy, forming the walls and ceiling of the channel; the transmission line itself formed the flooring of the channel.…”

Section: Experimental Results – Rf Lossmentioning

confidence: 99%

Ferrofluidic actuation of liquid metal for radio‐frequency applications

2018

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A new method is presented for actuating liquid metals, based on the physical deformation of ferrofluid in response to an applied magnetic field. Using this ferrofluidic actuation, a liquid-metal slug was moved through a channel at an average velocity of 15.6 mm/s. The hydrocarbon-based ferrofluid exhibits negligible loss from 50 MHz to 20 GHz, and can thus serve as an alternative carrier fluid to hydrochloric acid or sodium hydroxide for liquid-metal-based reconfigurable radio-frequency circuits.

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“…Therefore, the characterizing electrical properties of PDMS as part of the antenna design cycle is critical, rather than solely relying on reported data. Various effective approaches for characterizing electrical properties have been reported in [58].…”

Section: Polymer Embedded Antennasmentioning

confidence: 99%

Recent Advances in Fabrication Methods for Flexible Antennas in Wearable Devices: State of the Art

Mohamadzade

Hashmi

Simorangkir

et al. 2019

Sensors

123

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Antennas are a vital component of the wireless body sensor networks devices. A wearable antenna in this system can be used as a communication component or energy harvester. This paper presents a detailed review to recent advances fabrication methods for flexible antennas. Such antennas, for any applications in wireless body sensor networks, have specific considerations such as flexibility, conformability, robustness, and ease of integration, as opposed to conventional antennas. In recent years, intriguing approaches have demonstrated antennas embroidered on fabrics, encapsulated in polymer composites, printed using inkjets on flexible laminates and a 3-D printer and, more interestingly, by injecting liquid metal in microchannels. This article presents an operational perspective of such advanced approaches and beyond, while analyzing the strengths and limitations of each in the microwave as well as millimeter-wave regions. Navigating through recent developments in each area, mechanical and electrical constitutive parameters are reviewed, and finally, some open challenges are presented as well for future research directions.

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1 to 220 GHz Complex Permittivity Behavior of Flexible Polydimethylsiloxane Substrate

Cited by 32 publications

References 11 publications

Thin PDMS-on-Sacrificial-PCB Devices

Thin PDMS-on-Sacrificial-PCB Devices

Ferrofluidic actuation of liquid metal for radio‐frequency applications

Recent Advances in Fabrication Methods for Flexible Antennas in Wearable Devices: State of the Art

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