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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 3: Dielectric, Elastic and Electromechanical Properties
KFM 3.1: Vortrag
Montag, 16. März 2020, 12:00–12:20, HSZ 105
High sensitivity characterization of the nonlinear electric susceptibility of a glass ceramic in the microwave range — •Florian Bergmann1,2,3, Martin Letz1,2,3, Holger Maune4, and Gerhard Jakob1,3 — 1Johannes Gutenberg Universität Mainz — 2Schott AG Mainz — 3MAINZ Graduate School — 4TU Darmstadt
The 5G mobile communication standard aims to provide massive data rates to an increasing number of devices. This requires the use of higher frequencies and the efficient use of the available frequencies. A major challenge in the efficient use of frequencies is cross talk between channels due to passive intermodulation (PIM). One source of PIM can be the nonlinear electric susceptibility of dielectrics used in the devices. We characterized this nonlinearity of a glass ceramic. To achieve the necessary sensitivity for dielectric nonlinearities, the setup ensures that the measured intermodulation can be ascribed to the material under test while all other intermodulation sources are suppressed. The magnitude is comparable to previously measured high-end sintered ceramics. The power of the intermodulation signal as a function of the input power deviates from the simple 3 dB/dB scaling. This allows new insights into the polarization mechanisms of materials.