A Quadrature-Based Tunable Radio-Frequency Sensor for the Detection and Analysis of Aqueous Solutions

被引：15

作者：

Cui, Yan ^{[1
]}

He, Yuxi ^{[1
]}

Wang, Pingshan ^{[1
]}

机构：

[1] Clemson Univ, Dept Elect & Comp Engn, Clemson, SC 29634 USA

来源：

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS | 2014年 / 24卷 / 07期

基金：

美国国家科学基金会;

关键词：

Complex dielectric permittivity; microfluidics; microwave sensor; MICROWAVE; RESONATOR; FILTERS;

D O I：

10.1109/LMWC.2014.2316235

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A highly tunable and sensitive radio-frequency (RF) sensor is presented for the measurement of aqueous-solution dielectric properties. Two quadrature hybrids are utilized to achieve destructive interference that eliminates the probing signals at both measurement ports. As a result, weak signals of material-under-test (MUT) are elevated for high sensitivity detections at different frequencies. The sensor is demonstrated through measuring 2-propanol-water solution permittivity at 0.01 mole fraction concentration level from similar to 4 GHz to similar to 12 GHz. De-ionized water and methanol-water solution are used to calibrate the sensor for quantitative MUT analysis through our proposed model. Micro-meter coplanar waveguides (CPW) are fabricated as RF sensing electrodes. A polydimethylsiloxane (PDMS) microfluidic channel is employed to introduce 250 nL liquid, of which similar to 1 nL is effectively the MUT. The permittivity and the relaxation time of 2-propanol-water solution are obtained. Compared with our power divider based sensors, the differential reflection coefficients in this work provide additional information that complements the transmission coefficient methods.

引用

页码：490 / 492

页数：3

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