Regensburg 2019 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 3: Dielectric, Elastic and Electromechanical Properties
KFM 3.2: Vortrag
Montag, 1. April 2019, 09:50–10:10, PHY 5.0.21
Characterization of extremely small nonlinearities of dielectric response in glasses and glass ceramics — •Florian Bergmann1,2, Martin Letz1,2, Gerhard Jakob1, and Holger Maune3 — 1Johannes Gutenberg Universität Mainz — 2Schott AG Mainz — 3TU 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). Due to the large differences in the intensity of receiving and transmitting channels, even tiniest intermodulation levels need to be controlled. One source of intermodulation is the nonlinear response of dielectrics to the electric field. However, it is hard to characterize the intrinsic material nonlinearity as the nonlinearity of the setup itself produces intermodulation. Following a resonator method exciting eigenresonances of three coupled cylindrical dielectric resonators enables to measure nonlinear behavior at high field strengths and allows isolating the resonators’ material nonlinearities from other intermodulation sources. The setup enables to measure a third order nonlinear term being 10−10 times smaller than the linear response at electric field amplitudes of a few V/mm. We report on the characterization measurements of the nonlinearity of glasses and glass ceramics.