Journal
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Volume 13, Issue 2, Pages 287-290Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2003.813711
Keywords
filters; high-temperature superconductors; mobile communication; resonators
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We have developed a 17-pole high-temperature superconductor thin-film hairpin microstrip filter on r-cut sapphire substrate. We determined the optimum orientation of hairpin resonators on r-cut sapphire substrates, considering the anisotropy of dielectric permittivity. With optimum orientation, the desired frequency response was realized. On the other hand, when the orientation was not the optimum, the frequency response was violently disturbed. The cause of the disturbance of the frequency response was investigated.
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