Measurements of the surface resistance and conductivity of thin conductive films at frequency about 1GHz employing dielectric resonator technique

Křupka, J.; Derzakowski, K.; Zychowicz, T.; Givot, B.L.; Egbert, William C.; David, Muñoz-Rojas

doi:10.1016/j.jeurceramsoc.2006.11.008

Cited by 9 publications

(2 citation statements)

References 7 publications

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“…This plays an important role in the on-state conductivity of the Ge-doped VO 2 , as ideally it is not desirable to operate far below the skin depth in rf-microwave design. The thin film thickness/skin depth ratio should be as big as possible, else the σ dc_ON values measured in dc may not be obtained while working in ac, leading to potentially bigger conductive losses. − …”

Section: Resultsmentioning

confidence: 99%

Radio-Frequency Characteristics of Ge-Doped Vanadium Dioxide Thin Films with Increased Transition Temperature

Müller

Khadar

Abel

et al. 2020

ACS Appl. Electron. Mater.

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This work investigates and reports on the radio-frequency (rf) behavior in the frequency range of 5–35 GHz of germanium-doped vanadium dioxide (Ge-doped VO2) thin films deposited on silicon substrates via sputtering and pulsed laser deposition (PLD) with estimated Ge concentrations of 5 and 5.5%. Both films exhibit critical transition temperatures (T c) of 76.2 and 72 °C, respectively, which are higher compared to that of the undoped VO2 which undergoes reversible insulator-to-metal phase transition at 68 °C. Both types of Ge-doped films show low hysteresis (<5 °C) in their conductivity versus temperature characteristics and preserve high off-state dc-conductivities (corresponding to the insulating state of the phase change material) of 13 S/m for the sputtered and 55 S/m for the PLD-deposited film, respectively. The dc on-state (corresponding to the conductive state of the phase change material) conductivity reaches 145,000 S/m in the case of the PLD film, which represents a significant increase compared to the state-of-the art values measured for undoped VO2 thin films deposited on identical substrates. In order to further understand the off-state dissimilarities and rf behavior of the deposited Ge-doped VO2 films, we propose an original methodology for the experimental extraction of the dielectric constant (εr) in the GHz range of the films below 60 °C. This is achieved by exploiting the frequency shift of resonant filters. For this purpose, we have fabricated coplanar waveguide structures incorporating ultracompact Peano space-filling curves, each resonating at a different frequency between 5 and 35 GHz on two types of substrates, one with the Ge-doped VO2 thin films and another one using only SiO2 to serve as the reference. The reported results and analysis contribute to the advancement of the field of metal–insulator–transition-material technology with high T c for rf industrial applications.

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Section: Resultsmentioning

confidence: 99%

Radio-Frequency Characteristics of Ge-Doped Vanadium Dioxide Thin Films with Increased Transition Temperature

Müller

Khadar

Abel

et al. 2020

ACS Appl. Electron. Mater.

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show abstract

“…The accuracy of the measurement using the dielectric resonator relies on the assumption that the conductor deposit is bulk. The deposited conductor is only assumed to be bulk if its thickness is at least 3δ, where δ = 1 √ πf κμ [6]. If the deposited conductor is thinner, the electromagnetic field can in part penetrate through the conductor into the carrier.…”

Section: Surface Resistance Measurements By Means Of a Dielectric Resmentioning

confidence: 99%

Conductivity Measurements of Silverpastes

Dirix¹,

Koch²

2010

Acta Polytech

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The development of three-dimensional printed circuit boards requires research on new materials which can easily be deformed. Conducting pastes are well suited for deformation even after they are applied to the dielectric carrier. This paper deals with measurements of the electrical conductivity of these conducting pastes. Two different conductivity measurement techniques are explained and carried out. The resulting measurements give an overview of the conductivity of several measured samples.

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Radio-wave electrical conductivity and absorption-dominant interaction with radio wave of exfoliated-graphite-based flexible graphite, with relevance to electromagnetic shielding and antennas

Guan

Chung

2020

Carbon

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Measurements of the surface resistance and conductivity of thin conductive films at frequency about 1GHz employing dielectric resonator technique

Cited by 9 publications

References 7 publications

Radio-Frequency Characteristics of Ge-Doped Vanadium Dioxide Thin Films with Increased Transition Temperature

Radio-Frequency Characteristics of Ge-Doped Vanadium Dioxide Thin Films with Increased Transition Temperature

Conductivity Measurements of Silverpastes

Radio-wave electrical conductivity and absorption-dominant interaction with radio wave of exfoliated-graphite-based flexible graphite, with relevance to electromagnetic shielding and antennas

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