Determination of Complex Permittivity of Arbitrarily Dimensioned Dielectric Modules at Microwave Frequencies

1971 ◽  
Vol 19 (6) ◽  
pp. 517-521 ◽  
Author(s):  
W. Rueggeberg
Keyword(s):  
Complex Permittivity ◽  
Microwave Frequencies

scholarly journals Characterisation of dielectric 3D-printingmaterials at microwave frequencies

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 26
Author(s):  
Andrea Alimenti ◽  
Kostiantyn Torokhtii ◽  
Nicola Pompeo ◽  
Emanuele Piuzzi ◽  
Enrico Silva
Keyword(s):  
Quality Factor ◽  
Loss Tangent ◽  
Complex Permittivity ◽  
High Frequency ◽  
Measurement Method ◽  
Air Gap ◽  
3D Printer ◽  
Reliable Determination ◽  
Microwave Frequencies

<p class="Abstract">3D-printer materials are becoming increasingly appealing, especially for high frequency applications. As such, the electromagnetic characterisation of these materials is an important step in evaluating their applicability for new technological devices. We present a measurement method for complex permittivity evaluation based on a dielectric loaded resonator (DR). Comparing the quality factor <em>Q</em> of the DR with a disk-shaped sample placed on a DR base, with <em>Q</em> obtained when the sample is substituted with an air gap, allows a reliable determination of the loss tangent.</p>

Label-free RF biosensors for human cell dielectric spectroscopy

2009 ◽  
Vol 1 (6) ◽  
pp. 497-504 ◽  
Author(s):  
Claire Dalmay ◽  
Arnaud Pothier ◽  
Mathilde Cheray ◽  
Fabrice Lalloue ◽  
Marie-Odile Jauberteau ◽  
...  
Keyword(s):  
Human Cell ◽  
Cell Types ◽  
Label Free ◽  
Microwave Frequencies ◽  
Non Invasive ◽  
System Cell ◽  
Electromagnetic Characteristics ◽  
Biosensor Chip ◽  
Rf Signal

This paper presents an original biosensor chip allowing determination of intrinsic relative permittivity of biological cells at microwave frequencies. This sensor permits non-invasive cell identification and discrimination using an RF signal to probe intracellular medium of biological samples. Indeed, these sensors use an RF planar resonator that allows detection capabilities on less than 10 cells, thanks to the microscopic size of its sensitive area. Especially, measurements between 15 and 35 GHz show the ability label-free biosensors to differentiate two human cell types using their own electromagnetic characteristics. The real part of permittivity of cells changes from 20 to 48 for the nervous system cell types studied. The proposed biodetection method is detailed and we show how the accuracy and the repeatability of measurements have been improved to reach reproducible measurements.

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