Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 11: Dielectric, Elastic and Electromechanical Properties
KFM 11.2: Vortrag
Dienstag, 13. März 2018, 10:20–10:40, EMH 025
Characterization of extremely small nonlinearities of dielectric response in glasses and glass ceramics — •Florian Bergmann1,2, Martin Letz1,2, Gerhard Jakob2, and Holger Maune3 — 1Schott AG, Mainz, Germany — 2Johannes Gutenberg Universität, Mainz, Germany — 3Technische Universität, Darmstadt, Germany
Recent mobile network solutions require better microwave circuit performances than ever before. Material solutions need to tackle the challenge of intermodulation between high power signals, e.g. the sending channels of a microwave base station. Intermodulated signals can interfere with the receiving channel with orders of magnitude lower intensity. Therefore, also these very weak passive intermodulation (PIM) levels need to be controlled. One source of intermodulation is the nonlinear response of dielectrics to the electric field. However, there exists only few experimental data on the characterization of nonlinear dielectrics in the GHz frequency range with a sensitivity necessary for mobile communication solutions. Following a resonator method (1) exciting eigenresonances of three coupled cylindrical dielectric resonators enables to measure nonlinear behavior at high field strengths and allow isolating the resonators' material nonlinearities from other intermodulation sources. We report on the latest progress on determining the nonlinear response of glass and glass-ceramics.
(1) T. Nishikawa et al. 'Third harmonic distortion of dielectric resonator material' Jpn. J. Appl. Phys. 28, 2528-31, (1989).