Advances in Radio Science www.adv-radio-sci.net 1684-9965 1684-9973 6 Kleinheubacher Berichte 2007 2008 10.5194/ars-6-5-2008 http://www.adv-radio-sci.net/6/5/2008/ http://www.adv-radio-sci.net/6/5/2008/ars-6-5-2008.html http://www.adv-radio-sci.net/6/5/2008/ars-6-5-2008.pdf 5 8 2008-05-26 Identification of the complex relative dielectric constant of porous polymers at different degrees of humidity K. Haake k.haake@tu-harburg.de J. L. ter Haseborg Hamburg University of Technology, Institute for Metrology and EMC, Germany In order to investigate the complex relative dielectric constant of different materials over a frequency range of 50 MHz to 3 GHz a setup has been built that allows rf-measurements in a climate chamber. Within this chamber the temperature and humidity can be changed and be measured by accurate sensors. The construction of the rf-part of the setup has been made with an outer cylindrical shell that allows climate interactions through its large orifices. Methods for calculating the complex relative dielectric constant from the measured scattering parameters are presented and the changes of the relative constants due to different humidity conditions are shown. Hilbrunner, F.: Ein Beitrag zur Feuchtekompensation von Präzisionsmeßgeräten, PhD. Thesis, Technische Universität Ilmenau, Ilmenau, 2005. Rojas-Coto, A. and ter Haseborg, J. L.: Bestimmung der Induktivität komplexer großer metallischer Strukturen mittels Reusenleiteraufbau für die EMV-Analyse, Int. Fachmesse und Kongress für EMV, VDE-Verlag GmbH, Offenbach, 2006. Schiek, B.: Meßsysteme der Hochfrequenztechnik, Hüthig, Heidelberg, 1984. Unger, H.-G.: Elektromagnetische Wellen auf Leitungen Hüthig, Heidelberg, 1995. Vidémé Bossou, O.: A simple & accessible front-end satellite receiver for communication and e-learning, PhD. Thesis, Ecole Polytechnique Fédérale de Lausanne, Lausanne, 2007. Zamow, D.: Untersuchung und Simulation des Absorptionsverhaltens in TEM-Wellenleitern, diploma thesis, Universität Hannover, 2006.