High-Q Tl/sub 2/CaBa/sub 2/Cu/sub 2/O/sub 8/ high-T/sub c/ superconducting quasi-optical millimeter-wave bandpass filters working at 77 K

Tl/sub 2/CaBa/sub 2/Cu/sub 2/O/sub 8/ high-temperature superconducting thin films with T/sub c/'s of over 100 K on LaAlO/sub 3/ substrates were used to fabricate quasi-optical millimeter-wave bandpass filters. Q-factors of over 400 were achieved, at liquid nitrogen temperatures from these filters at W-band frequencies (75-110 GHz).<
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