Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 21, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/21/4/043001
Keywords
dielectric spectroscopy; complex dielectric function; wideband microwave measurements; radio-frequency spectroscopy
Funding
- Pennsylvania State University
- Huck Institute of the Life Sciences
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A wideband differential detector for high-sensitivity rf and microwave dielectric spectroscopy of liquids is described. The device is unique in that it has very high wideband sensitivity and requires extremely small (nanoliter range) volumes of the liquid. In addition, the device has good linearity and can be used for quantitative extraction of the frequency-dependent dielectric function epsilon(omega) of extremely small volumes of liquids. Using this device, quantitative measurements of the dielectric function at frequencies from 50 MHz to 1.6 GHz are demonstrated for 200 nL volume samples of liquids. The detector may be used for wideband rf/microwave spectroscopic analysis of chemical and biological samples.
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