Two-pole tunable bandpass filter based on YBCO plated single crystal KTO disk resonators

This paper addresses design and experimental characterization of a two-pole 1.5% bandpass tunable filter operating at 0.9 GHz and 77 K. The filter is based on two YBCO plated KTaO/sub 3/ disc resonators (0.5-mm-thick, 10 mm in diameter) and utilizes the TM/sub 020/ mode. The tunability is achieved t...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2004-03, Vol.14 (1), p.1-6
Main Authors: Eriksson, A., Deleniv, A.N., Gevorgian, S.
Format: Article
Language:English
Subjects:
Applied sciences
Band pass filters
Bandwidth
COPPER OXIDE
DIELECTRIC CONSTANT
Direct current
Disks
Electric fields
Electric filters
Electric potential
Electrodes
Electronics
Exact sciences and technology
Ferroelectric materials
High temperature superconductors
Insertion loss
Microwave filters
PLATE
PLATING
Resonator filters
Resonators
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
SINGLE CRYSTALS
Superconducting devices
Superconducting filters
SUPERCONDUCTORS
Tuning
YBCO superconductors
Yttrium barium copper oxide
YTTRIUM OXIDE
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Summary:This paper addresses design and experimental characterization of a two-pole 1.5% bandpass tunable filter operating at 0.9 GHz and 77 K. The filter is based on two YBCO plated KTaO/sub 3/ disc resonators (0.5-mm-thick, 10 mm in diameter) and utilizes the TM/sub 020/ mode. The tunability is achieved through the nonlinear DC electric field dependence of the relative dielectric constant of KTaO/sub 3/. About 5% tuning range is achieved at 500 V driving voltage. Although the insertion losses are relatively high (about -5 dB at 500 V) the shape of the passband is essentially stable. A rather good agreement between simulated and experimental performances is found.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2004.825387