Abstract
Passive devices using high temperature superconductors are already going to be implemented in electronics for passive filtering in telecommunications. To avoid the frequency jamming not only in terrestrial and satellite communications but also in the radar frequency ranges, filter agility is essential to undertake further development. We will discuss here the interest of using SrTiO 3 as tunable oxide for agile devices and present our last results on voltage agile microwave resonator fabricated from YBa 2 Cu 3 O 7 /SrTiO 3 heterostructures. A strong correlation is found between Q 0 or agility and the tetragonal distortion of the SrTiO 3 layer. The resonator performance is markedly increased by associating growth parameter optimization and ex situ annealing of SrTiO 3 layer prior to the YBa 2 Cu 3 O 7 deposition. Annealed samples exhibit almost voltage independent losses of about 5 2 10 m 3 at 6 GHz and 77 K, with l r at 1200 showing a variation of S 50% at 10 5 V/m.
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