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12 Jan 2009

Volume 94, Issue 2, Articles (02xxxx)

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Appl. Phys. Lett. 94, 022101 (2009); http://dx.doi.org/10.1063/1.3065067 (3 pages)

Hong Li and Qing Zhang
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A radio frequency device for measurement of minute dielectric property changes in microfluidic channels

Chunrong Song and Pingshan Wang

Appl. Phys. Lett. 94, 023901 (2009); http://dx.doi.org/10.1063/1.3072806 (3 pages) | Cited 8 times

Online Publication Date: 16 January 2009

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We demonstrate a sensitive radio frequency (rf) device to detect small dielectric property changes in microfluidic channel. The device consists of an on-chip Wilkinson power divider and a rat-race hybrid, which are built with planar microstrip lines and thin film chip resistors. Interference is used to cancel parasitic background signals. As a result, the measurement sensitivity is improved by more than 20 dB compared with conventional transmission lines. Compared with an ultrasensitive slot antenna/cuvette assembly [ K. M. Taylor and D. W. van der Weide, IEEE Trans. Microwave Theory Tech. 53, 1576 (2005) ], the proposed rf device is two times more sensitive.
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84.40.-x Radiowave and microwave (including millimeter wave) technology
84.37.+q Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.)
07.57.-c Infrared, submillimeter wave, microwave and radiowave instruments and equipment
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