No abstract

Resonators are the single most important ingredient in microwave and radio frequency circuits. We have produced some helical resonators using a bulk Ba2YCu3O7 high Tc ceramic superconductor. These resonators, which operate at 77 K and cover the frequency range from 0.1 to 2.0 GHz, outperform their all copper counterparts by at least a factor of 5 in unloaded Q.

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A superconducting line should be essentially lossless and dispersionless and have a purely resistive impedance up to at least 10 GHz. In fact we expect that a long (>I km) line could carry nanosecond rise time pulses with zero distortion and low loss (<1 dBlkm). We have measured the losses in some short sections of coaxial line containing ceramic high-T, superconducting-center conductors over the frequency range from 5 to 50 M H z . There is only a slight improvement over a completely copper coaxial line. [

No abstract