Transmission Line Loss Properties of Dielectric Loss Tangent and Conductive Surface Roughness in 5G Millimeter Wave Band

Morimoto, Yasuo; Motegi, Takeshi; Kasai, Wataru; Niwano, Kazuhiko

doi:10.1109/apmc47863.2020.9331571

Cited by 3 publications

(1 citation statement)

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“…1(d) will require a full knowledge of some properties such as conductivity of the metal layer, its thickness, the permittivity of the substrate and its dielectric losses. The roughness of the PCM material must be also known, as it may modify the effective permittivity of the line and the conductivity of the metallisation [33], [34].…”

Section: Extraction Of the Permittivity Of The Pcm Layer Frommentioning

confidence: 99%

Dielectric Properties of Phase Change Thin Films at Millimeter Waves

Carrizales-Juarez

Huitema

Passerieux

et al. 2023

IEEE Trans. Microwave Theory Techn.

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We present the characterization of the dielectric permittivity and loss tangent of germanium telluride (GeTe) and germanium antimonium telluride (Ge2Sb2Te5-GST) phase change thin-films (less than 1 μm thicknesses) in the millimeter-wave (mmW) domain. The dielectric permittivities in the amorphous (insulator) state of GeTe and GST were measured using two independent differential methods: a wide bandwidth characterization based on the measurement of the propagation constant of a coplanar waveguide and a single frequency characterization based on the measurement of the resonant frequency of a planar resonator. This differential approach allows us to extract the permittivity of the thin film without taking into consideration other parameters of the circuit like the conductivity and the thickness of the metals as well as the losses of the substrate and their permittivity. The extracted mean values range between are 20-22 for the GeTe and 30-34 for the GST. These values are rather constant over the frequency range from 10 GHz to 60 GHz. Additionally, the loss tangent at 30 GHz of both compositions was extracted giving values of 3.4x10 -2 and 3.2x10 -1 for the GeTe and GST, respectively. These values are among the first reported ones regarding the electromagnetic properties of GeTe and GST in this frequency band.

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Section: Extraction Of the Permittivity Of The Pcm Layer Frommentioning

confidence: 99%