Electromagnetic Characterization of Thin Films by Using Non-Contacting Waveguides

Rodini, Sandra; Genovesi, Simone; Manara, Giuliano; Costa, Filippo

doi:10.1109/tap.2022.3177521

Cited by 4 publications

(4 citation statements)

References 27 publications

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“…The reflection value is modulated by the sheet resistance value of the ground plane which varies as a function of applied stretching. The RF sheet resistance of PZ was analyzed in previous works [31], [32].…”

Section: Strain Sensor Designmentioning

confidence: 99%

“…The overall matrix of the studied system is the product of the ABCD matrix of single building blocks. Once derived the complete ABCD matrix of the system, it is possible to derive both the reflection coefficient of the circuit model [32].…”

Section: Fssmentioning

confidence: 99%

“…The sheet impedance properties of some PZ materials have been carried out in [31] and [32] where a contactless approach allowed to estimate the surface impedance of the material starting from the scattering parameters. The investigated measurement methodologies provide accurate estimations for materials with sheet impedance exceeding 10 /sq.…”

Section: A Pz Materials Characterizationmentioning

confidence: 99%

“…The sheet was stretched in 1 cm steps in order to study its behavior as a function of applied stretch. From the measured scattering parameters, through an inversion procedure, the surface impedance value of the material has been obtained [32], [33]. The estimated range for the real part of the surface resistance is between 0.18 and 0.31 at 6.8 GHz as it can be observed in Fig.…”

Section: A Pz Materials Characterizationmentioning

confidence: 99%

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Chipless Wireless Strain Sensor Based on Stretchable Piezoresistive Materials

Rodini,

Genovesi,

Manara

et al. 2023

IEEE Sensors J.

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Piezoresistive (PZ) materials are frequently employed for the fabrication of wired strain sensors by exploiting the variation of the surface resistance observed when a mechanical stimulus is applied. However, this variation is measured by electrodes connected to the sheet. In this work, we propose to extract the strain information from the PZ material by using a completely wireless approach. The sensor is based on a resonant absorbing structure working at 7.39 GHz that exploits the interaction between an unstretchable metasurface and the PZ material used as ground plane. When the PZ sheet is stretched, a variation of the reflection coefficient at the resonance frequency is observed because of the sheet resistance variation. Differently from other chipless strain sensors based on stretchable substrates which are based on a deformation of the metallic pattern under applied strain, here, the strain is only applied to the PZ material. The proposed passive wireless sensor has been thoroughly modeled through a transmission line (TL) approach to clarify the physical mechanism that induces the scattering modulation. Finally, experimental results that verify the proposed strain sensing approach are presented. The experiments have been carried out several times to evaluate the measurement uncertainty. A sensor sensitivity of 0.5 dB/% has been estimated. The proposed approach considerably simplifies the realization of passive wireless strain sensors as it is not required to print resonators on stretchable substrates with ad hoc manufacturing processes, but it is sufficient to employ commercially available stretchable shielding materials.

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Section: Strain Sensor Designmentioning

confidence: 99%

Section: Fssmentioning

confidence: 99%