Dokument-ID Dokumenttyp Autoren/innen Persönliche Herausgeber/innen Haupttitel Abstract Auflage Verlagsort Verlag Herausgeber (Institution) Erscheinungsjahr Titel des übergeordneten Werkes Jahrgang/Band ISBN Veranstaltung Veranstaltungsort Beginndatum der Veranstaltung Enddatum der Veranstaltung Ausgabe/Heft Erste Seite Letzte Seite URN DOI Lizenz Datum der Freischaltung OPUS4-44752 Beitrag zu einem Tagungsband Prasetiadi, A. E.; Jost, M.; Schulz, Bärbel; Quibeldey, M.; Rabe, Torsten; Follmann, R.; Jakoby, R. Liquid-Crystal-Based Amplitude Tuner Fabricated A 30GHz liquid-crystal-based amplitude tuner is proposed for the first time. The amplitude of a signal can be controlled by using the interference principle. An input signal is divided into a tunable liquid crystal phase shifter and a fixed transmission line. Later, the divided signals are combined together at the output port. The output amplitude depends on the phase difference between the tunable and the fixed line. The low temperature co-fired ceramic technology is utilized to fabricate the device. The measurement shows an attenuation range of 11 dB to 30 dB with a maximum biasing voltage of 100V. IEEE 2017 Proceedings of the 12th European Microwave Integrated Circuits Conference 978-2-87487-048-4 12th European Microwave Integrated Circuits Conference Nürnberg, Germany 09.10.2017 10.10.2017 345 348 2018-04-25 OPUS4-46985 Zeitschriftenartikel Prasetiadi, A. E.; Jost, M.; Schulz, Baerbel; Quibeldey, M.; Rabe, Torsten; Follmann, R.; Jakoby, R. Liquid-crystal-based amplitude tuner and tunable SIW filter fabricated in LTCC technology Tunable microwave devices will play an important role in future wireless systems, in which high-frequency bands, e.g. millimeter waves, will become promising, due to its huge spectrum availability. At such frequency bands, liquid crystals (LCs) exhibit low microwave loss, which is excellent compared with the other tuning elements. In this paper, LC-based microwave components are fabricated by using low temperature co-fired ceramic technology, allowing the integration of the LC into microwave structures. The first component, the Amplitude tuner, controls the signal's amplitude by using the interference concept, which exhibits a tunable attenuation range from 11 dB to 30 dB at 30 GHz. The second component is a 3-pole tunable bandpass filter, which is realized by using a substrate integrated waveguide topology, enabling a device with comparatively high-quality factors (Q-factors). The measurement results show Q-factors in the range of 68 to 100 for a frequency tuning of 29.4-30.1 GHz, i.e. a tuning range of 700 MHz, accompanied by an insertion loss 2 dB to 4 dB. Cambridge University Press European Microwave Association 2018 International Journal of Microwave and Wireless Technologies 10 5-6 674 681 10.1017/S1759078718000600 2018-12-12 OPUS4-35268 Beitrag zu einem Tagungsband Jost, M.; Strunck, S.; Heunisch, Andreas; Wiens, A.; Prasetiadi, A.E.; Weickhmann, C.; Schulz, Bärbel; Quibeldey, M.; Karabey, O.H.; Rabe, Torsten; Follmann, R.; Koether, D.; Jakoby, R. Continuously tuneable liquid crystal based stripline phase shifter realised in LTCC technology This work presents the design, fabrication and measurements of a low temperature cofired ceramic (LTCC) integrated liquid crystal (LC) phase shifter. The effective permittivity of the phase shifter and therefore its differential phase shift can be tuned continuously by orienting the LC directors with electric fields. The phase-shift demonstrator is designed for Ka-band frequencies around 30 GHz and represents a stripline filled with LC, embedded inside an LTCC multilayer structure, which provides a space-qualified and hermetically-sealed LC cavity within an RF-capable material system. The total length of the device is 37 mm while the phase shifting LC section has a length of 14.6 mm. At 30 GHz it exhibits a differential phase shift of 60° with an insertion loss around 6 dB, resulting in a figure of merit around 10°/dB. An advantage is that the insertion loss is nearly independent of the tuning state of the LC. The response time of the phase shifter, depending on the desired LC orientation, is between 62 ms and 37 s. The European Microwave Association (EuMA) 2015 EuMC 2015 - 45th European microwave conference (Proceedings) 978-2-87487-039-2 EuMC 2015 - 45th European microwave conference Paris, France 07.09.2015 10.09.2015 1260 1263 2016-02-20 OPUS4-44753 Beitrag zu einem Tagungsband Prasetiadi, A .E.; Jost, M.; Schulz, Bärbel; Quibelday, M.; Rabe, Torsten; Follmann, R.; Jakoby, R. Liquid-Crystal-Based Amplitude Tuner Fabricated 30GHz liquid-crystal-based amplitude tuner is proposed for the first time. The amplitude of a signal can be controlled by using the interference principle. An input Signal is divided into a tunable liquid crystal phase shifter and a fixed transmission line. Later, the divided signals are combined together at the output port. The output amplitude depends on the phase difference between the tunable and the fixed line. The low temperature co-fired ceramic technology is utilized to fabricate the device. The measurement shows an attenuation range of 11 dB to 30 dB with a maximum biasing voltage of 100V. IEEE 2017 Proceedings of the 47th European Microwave Conference 978-2-87487-047-7 47th European Microwave Conference Nürnberg, Germany 10.10.2017 12.10.2017 1085 1088 2018-04-25