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A thermal thin-film high-temperature superconductor (HTS) switch that is easily inserted into high-performance HTS transmission lines is presented. A microwave switch in Tl-Ca-Ba-Cu-O has been developed based on driving a small bridge, embedded in a transmission line, normal via current in an external control line. In the on-state, insertion loss was less than 1 dB over the tested range of 0.5-8.5 GHz. Isolation in the off-state exceeded 30 dB over this frequency range. Response times are on the order of a microsecond, adequate for many microwave/millimeter-wave applications such as switched phase shifters.>
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Martens et al. (1991) studied this question.
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