Articles | Volume 4, issue 1
J. Sens. Sens. Syst., 4, 125–131, 2015
https://doi.org/10.5194/jsss-4-125-2015

Special issue: 17th ITG/GMA-Conference on Sensors and Measurement Systems...

J. Sens. Sens. Syst., 4, 125–131, 2015
https://doi.org/10.5194/jsss-4-125-2015

Regular research article 19 Mar 2015

Regular research article | 19 Mar 2015

Investigation of dielectric properties of multilayer structures consisting of homogeneous plastics and liquid solutions at 75–110 GHz

M. Klenner1, T. Abels1, C. Zech1, A. Hülsmann1, M. Schlechtweg1, and O. Ambacher1,2 M. Klenner et al.
  • 1Fraunhofer Institute for Applied Solid State Physics (IAF), Freiburg im Breisgau, Germany
  • 2Department of Microsystems Engineering (IMTEK), University of Freiburg, Freiburg im Breisgau, Germany

Abstract. In this paper, we demonstrate an active 3-D millimeter wave (mmW) imaging system used for characterization of the dielectric function of different plastic materials and liquid solutions. The method is based on reflection spectroscopy at frequencies between 75 and 110 GHz, denoted as W-band, and can be used to investigate homogeneous dielectric materials such as plastics or layered structures and liquid solutions. Precise measurement of their dielectric properties not only allows for characterization and classification of different fluids, but also for reliable detection and localization of small defects such as voids or delamination within multilayer structures built from plastic materials. The radio frequency (RF) signal generation is based on circuits that have been designed and fabricated at the Fraunhofer Institute for Applied Solid State Physics (IAF) using a 100 nm InGaAs mHEMT process (Tessmann et al., 2006; Weber et al., 2011).