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International Journal of Antennas and Propagation
Volume 2016, Article ID 1436798, 5 pages
http://dx.doi.org/10.1155/2016/1436798
Research Article

A Novel Technology for Measurements of Dielectric Properties of Extremely Small Volumes of Liquids

1College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, China
2Henan Key Discipline Open Laboratory of Electromagnetic Wave Detecting, Xinxiang 453007, China

Received 10 September 2015; Revised 22 November 2015; Accepted 29 November 2015

Academic Editor: Stefano Selleri

Copyright © 2016 Wei-Na Liu. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A high sensitivity sensor for measurement radio frequency (RF) dielectric permittivity of liquids is described. Interference is used and parasitic effects are cancellation, which makes the sensor can catch weak signals caused by liquids with extremely small volumes. In addition, we present the relationship between transmission coefficient and permittivity of liquids under test (LUT). Using this sensor, quantitative measurements of the dielectric properties at 5.8 GHz are demonstrated of LUTs. Experiments show that the proposed method only requires the volume of 160 nanoliters for liquids. Therefore, the technology can be used for RF spectroscopic analysis of biological samples and extremely precious liquids.