title: Broadband RF impedance spectroscopy in micromachined microfluidic channels.
abstract: Impedance spectroscopy in the radio frequency range from 100 MHz to 20 GHz can reveal the dielectric relaxations of biological and chemical solutions. S-parameters for a coplanar waveguide are derived. To perform these measurements, a coplanar waveguide device was fabricated on a conventional FR-4 substrate for fluid interrogation. The microfluidic channel was formed by milling conventional waveguides and laser-cutting channels in the dielectric substrate. Measurements using this device were performed on standards: deionized water, isopropyl alcohol, and air. These measurements were compared to those taken with a conventional dielectric probe. The results demonstrate the ability of the fabricated device to extract varying transmission parameters due to changing sample properties.
authors.affiliation: Department of Electrical and Computer Engineering, Brigham Young University, Provo, UT 84602, USA.
authors.forename: Matthieu
authors.initials: M
authors.lastname: Giraud-Carrier
authors.forename: Kyra
authors.initials: K
authors.lastname: Moon
authors.forename: Eric
authors.initials: E
authors.lastname: Teng
authors.forename: Aaron R
authors.initials: AR
authors.lastname: Hawkins
authors.forename: Karl F
authors.initials: KF
authors.lastname: Warnick
authors.forename: Brian A
authors.initials: BA
authors.lastname: Mazzeo
mesh_terms: D058266:Dielectric Spectroscopy / Q000379:methods*; D044085:Microfluidics / Q000295:instrumentation*; D008962:Models, Theoretical; D011846:Radio Waves