Nonlinear dielectrics for tunable microwave components

• Autorzy: Jakoby R. , Scheele P. , Müller S. , Weil C.
• Konferencja: 15 th International Conference on Microwaves, Radar and Wireless Communications MIKON'04. Warsaw, 17-19.05, 2004
• Języki publikacji: EN

Abstrakty

EN

Agile materials and technologies based on nonlinear dielectrics like ferroelectrics or liquid crystals offer a line of passive tunable microwave components such as varactors, filters and phase shifters, suitable as key components in phased-array antennas e.g. for automotive radar sensors and in future reconfigurable (frequency agile) RF-frontends, e.g. in mobile communications systems with multiband operation. The trend towards these commercial microwave applications involves a demand for cheaply integrated, compact devices with both, high tunability and low insertion loss. Therefore, distinct research interests have been focused on agile materials for tunable microwave components as promissing alternatives to active semiconductor devices or MEMS varactors. Starting with some results of ferroelectric thin-film devices from literature, the focus of this paper will be on our research of tunable microwave components based on (1) ferroelectric thick-films on A1203-substrate and (2) liquid-crystals. Up to now, only very few approaches used an anisotropy at microwaves, e.g. for phase shifting purposes. However, with recently developed, novel highly-anisotropic microwave LCs, a figure-of-merit of above 110°/dB at GHz has been achieved for a inverted- microstrip line phase shifter with comparatively low control voltages less than 30 V. At the same frequency, this exceeds by far the figure-of-merit of 30 to 50°/dB of BST-coplanar waveguide phase shifters, however, much lower tuning speed. This substantial progress opens up totally new low-cost LC applications beyond optics.

Słowa kluczowe

EN

dielectric; tunable microwave components

• Wydawca: Wydawnictwo Naukowe PWN SA
• Czasopismo: Kwartalnik Elektroniki i Telekomunikacji
• Rocznik: 2004
• Tom: Vol. 50, z. 4
• Strony: 675--694
• Opis fizyczny: Bibliogr. 37 poz., il., rys., tab., wykr.

Twórcy

autor

Jakoby R.

• Technische Universität Darmstadt, Institut für Hochfrequenztechnik, Merckstr. 25, 64283 Darmstadt, Germany

autor

Scheele P.

• Technische Universität Darmstadt, Institut für Hochfrequenztechnik, Merckstr. 25, 64283 Darmstadt, Germany

autor

Müller S.

• Technische Universität Darmstadt, Institut für Hochfrequenztechnik, Merckstr. 25, 64283 Darmstadt, Germany

autor

Weil C.

• Advanced Ferrite Technology GmbH, Spinnerei 44, 71522 Backnang, Germany

Bibliografia

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