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Fabrication of a High-performance Oscillator with a Tunable High-Q HTS $YBa_2Cu_3O_{7-\delta}$ Resonator  

Yang Woo Il (Department of Physics, Konkuk University)
Lee Jae Hun (Department of Physics, Konkuk University)
Hur Jung (Department of Electronic engineering, Konkuk University)
Lee Sang Young (Department of Physics, Konkuk University)
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Abstract
We investigated the phase noise of an oscillator with a extremely high-Q resonator used as the resonant element. A TE$_{011}$ mode rutile-loaded resonator with high-temperature superconductive (HTS) $YBa_2Cu_3O_{7-\delta}$(YBCO) films used as the endplates is prepared for this purpose. At 23.5 K, the unloaded Q and the loaded Q are 863000 and 180000, respectively. The phase noise of -104.8 dBc/Hz at 1 KHz offset was observed for the oscillator having a resonator with $Q_{L}$ =180000 at the $TE_{01\delta$ mode resonant frequency of 8.545 GHz at 23.5 K Such oscillators with very low phase noise are expected to be used for building up communication systems capable of efficient use of the frequency band and high-speed data transmission as well as for Doppler radars. Frequency tuning could be realized for the resonator by using a piezoactuator Applicability of the tunable rutile resonator for fabricating tunable oscillators of high performances is discussed.
Keywords
발진기;위상잡음;루타일 공진기;
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