Abstract
Work on a miniaturized cavity resonator operating at around 900 MHz is reported. This uses a superconducting spiral resonator to enable its size to be reduced substantially in comparison with conventional cavity realizations: the new cavity fits within a 2 cm cube. The superconducting spiral structure was made of YBa2Cu3Ox or Tl2Ba2CaCu2Ox on a 1 cm2 substrate of lanthanum aluminate (LaAlO3). The unloaded Q-factors at temperatures below Tc were ten and four times greater than with an equivalent copper spiral, for YBCO and TBCCO respectively. The reason for the poor result with TBCCO is presumed to be due to low film quality. The Q factors showed a relatively small power dependence from −40 dBm to +11 dBm input power. A simulation of the cavity predicted resonance at 860 MHz, compared with 840 MHz measured, and a Q-factor similar to that found with YBCO (≈ 1000).
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