Determination of Complex Permittivity of LRR Radome Materials Using a Scalar Quasi-Optical Measurement System

Part of the VDI-Buch book series (VDI-BUCH)


We developed a low-cost quasi-optical measurement system to determine the complex permittivity in the E-band (from 60 to 90 GHz). The evaluation is done in a non-destructive way and can be used for all kinds of single-layered and multi-layered dielectric materials. The method is based on measurements of the scalar transmission coefficient through planar samples for several angles of incidence and two different polarization states (parallel and perpendicular to the plane of incidence). A numerical optimization technique is used to derive the complex permittivity from the measured coefficients. The method utilizes a physical model of a dielectric slab of known thickness, which assumes that a plane wave is incident on the surface of the dielectric material. Measurement results are presented, which are in good agreement with data from the literature.


complex permittivity quasi-optical measurement microwave measurement material characterization 


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  1. [1]
    G. Friedsam. Bestimmung der komplexen Permittivität und Permeabilität im Millimeterwellenbereich, PhD thesis Technische Universität München, 1998.Google Scholar
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    E. Hecht, Optik. Bonn/München, Germany: Addison-Wesley, 1989.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  1. 1.Fachgebiet HöchstfrequenztechnikTechnische Universität MünchenMünchenGermany
  2. 2.AUDI AGIngolstadtGermany

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