A Multistate Single-Connection Calibration for Microwave-Microfluidics
Xiao Ma, Charles A. Little, Chris Long, Jordi Mateu, James Booth, James Hwang, Nate Orloff
With emerging medical, chemical, and biological applications of microwave-microfluidic devices, many researchers desire a fast, accurate calibration that can be achieved in a single connection. However, traditional on-wafer or coaxial calibrations require measurements of several different artifacts in order to correct the data prior to measuring the microwave-microfluidic device. Ideally, a single artifact would be able to present different impedance states to correct the vector network analyzer, minimizing drift and eliminating artifact-to-artifact connection errors. Here, we developed a multistate single-connection calibration that used a coplanar waveguide with a microfluidic channel. We then used measurements of the uncorrected scattering-parameters of the coplanar waveguide with the channel empty, filled with deionized water, and filled with 30 w% (30 grams per liter) of saline to construct an eight-term error model plus switch-term correction. After correction, the measured scattering parameters agreed with the finite-element simulations to within -40 dB from 100 MHz to 110 GHz. This multistate single-connection calibration is compatible with both wafer-probed and connectorized microwave-microfluidic devices for accurate impedance spectroscopy and materials characterization where multiple device measurements are not possible.
IEEE Transactions on Microwave Theory and Techniques
, Little, C.
, Long, C.
, Mateu, J.
, Booth, J.
, Hwang, J.
and Orloff, N.
A Multistate Single-Connection Calibration for Microwave-Microfluidics, IEEE Transactions on Microwave Theory and Techniques, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=923028
(Accessed December 5, 2023)