Identification of the complex relative dielectric constant of porous polymers at different degrees of humidity

[摘要] In order to investigate the complex relative dielectric constant ofdifferent materials over a frequency range of 50 MHz to 3 GHz a setup hasbeen built that allows rf-measurements in a climate chamber. Within thischamber the temperature and humidity can be changed and be measured byaccurate sensors. The construction of the rf-part of the setup has been madewith an outer cylindrical shell that allows climate interactions through itslarge orifices. Methods for calculating the complex relative dielectricconstant from the measured scattering parameters are presented and thechanges of the relative constants due to different humidity conditions areshown.

[学科分类] 电子、光学、磁材料