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High-Tc superconductive microwave filters

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10 Author(s)
W. G. Lyons ; MIT Lincoln Lab., Lexington, MA, USA ; R. R. Bonetti ; A. E. Williams ; P. M. Mankiewich
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Four-pole microstrip bandpass filters have been fabricated using both postannealed and in-situ-grown thin films of Y-Ba-Cu-O. The 4-GHz, 3% bandwidth filters exhibit, at 77 K, a passband insertion loss as low as 0.3 dB, compared with the 2.8-dB loss of similar gold metallic filters at the same temperature. These results demonstrate that complex passive microwave devices can be designed and implemented using high-temperature superconducting (HTS) material. More aggressive filter designs utilizing many more poles will result in much greater performance advantages for an HTS filter technology over a normal metal technology. Ultimately, ultrasharp-skirt filters can be produced, which would allow for more closely spaced communication channels and more efficient use of microwave communication bands than is currently possible with conventional filters

Published in:

IEEE Transactions on Magnetics  (Volume:27 ,  Issue: 2 )