Determination of complex permittivity using a scalar quasi-optical measurement system in the E-band

Conference: GeMIC 2008 - German Microwave Conference
03/10/2008 - 03/12/2008 at Hamburg-Harburg, Germany

Proceedings: GeMIC 2008

Pages: 3Language: englishTyp: PDF

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Pfeiffer, Florian; Biebl, Erwin M. (Technische Universität München, Fachgebiet Höchstfrequenztechnik, Arcisstr. 21, 80333 Munich, Germany)

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. 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 a similar system using vector measurement.