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HighTcsuperconducting three-pole parallel-coupled bandpass filters made from laser ablated YBa2Cu3O7 − δthin films

Authors
Journal
Applied Superconductivity
0964-1807
Publisher
Elsevier
Publication Date
Volume
4
Issue
3
Identifiers
DOI: 10.1016/s0964-1807(96)00014-2
Disciplines
  • Physics

Abstract

Abstract We have investigated three-pole parallel-coupled bandpass filters with fractional bandwidths of about 6% and 3% at a center frequency of 10.5 GHz utilizing high T c superconducting YBa 2Cu 3O 7 − δ thin films. The films were deposited on LaAlO 3 substrates by pulsed laser ablation. Microwave responses of the filters were measured as a function of temperature and input power. The performance of the 3% bandwidth filter exhibits low insertion losses of about 0.48 dB and 0.79 dB at 20 K and 77 K, respectively. The insertion loss in the 6% bandwidth filter was 0.96 dB at 77 K. Both filters showed return losses better than 15 dB. High T c superconducting bandpass filters showed good reproducibility. They were also compared with equivalent gold filters which showed insertion losses of more than 8 dB at 77 K.

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