scholarly journals UNIQUE PERMITTIVITY DETERMINATION OF LOW-LOSS DIELECTRIC MATERIALS FROM TRANSMISSION MEASUREMENTS AT MICROWAVE FREQUENCIES

2010 ◽  
Vol 107 ◽  
pp. 31-46 ◽  
Author(s):  
Ugur Cem Hasar
Keyword(s):  
Dielectric Materials ◽  
Low Loss ◽  
Microwave Frequencies ◽  
Transmission Measurements

Permittivity measurements of low-loss dielectric materials at 60 GHz

1996 ◽  
Author(s):  
Chriss A. Jones ◽  
John H. Grosvenor ◽  
Yehuda Kantor
Keyword(s):  
Dielectric Materials ◽  
60 Ghz ◽  
Low Loss ◽  
Permittivity Measurements

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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