HTS/ferroelectric devices for microwave applications

• Published in: IEEE transactions on applied superconductivity Vol. 7; no. 2; pp. 2458 - 2461
• Main Authors: Gevorgian, S.S., Carlsson, E.F., Rudner, S., Helmersson, U., Kollberg, E.L., Wikborg, E., Vendik, O.G.
• Format: Journal Article
• Language: English
• Published: IEEE 01.06.1997
• Subjects: Coplanar waveguides; Coplanar waveguides Ferroelectric devices Ferroelectric materials High temperature superconductors Microwave devices Phase shifters Superconducting filters Superconducting microwave devices Superconducting thin films Yttrium barium copper oxide; Ferroelectric devices; Ferroelectric materials; High temperature superconductors; Microwave devices; Phase shifters; Superconducting filters; Superconducting microwave devices; Superconducting thin films; Yttrium barium copper oxide
• ISSN: 1051-8223; 1558-2515; 1558-2515
• DOI: 10.1109/77.621737

High Temperature Superconducting (HTS, e.g. YBCO) microwave devices based on bulk or thin film ferroelectrics (e.g. Strontium Titanate-STO) are studied theoretically and experimentally. YBCO/STO/YBCO parallel-plate resonators and based on bulk single crystal STO are for electrically tunable high power filters, phase shifters and other devices in the frequency band 0.5-2.0 GHz of advanced microwave communication systems. Thin film YBCO/STO Inter-digital Capacitors (IDC), Coplanar Waveguides (CPW) phase shifters/delay lines are also designed and studied experimentally for low microwave power applications. Modelling problems of these devices and microwave losses in ferroelectrics are also discussed.