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RF tunable attenuator and modulator using high Tc superconducting filter

RF tunable attenuator and modulator using high Tc superconducting filter

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A small path for both control current and radiofrequency (RF) current has been introduced into a high Tc superconducting filter. The interaction between the control current and RF current made the insertion loss of the filter sensitive to the amplitude of the control current. This structure has been used as an RF tunable attenuator and a modulator. 5 dB attenuation range was achieved. The maximum modulation frequency was ~3 MHz.

Inspec keywords: superconducting filters; modulators; attenuators; tuning; high-temperature superconductors; radiofrequency filters

Other keywords: control current; radiofrequency current; modulator; RF tunable attenuator; high Tc superconducting filter; insertion loss

Subjects: Modulators, demodulators, discriminators and mixers; Other superconducting devices and material applications; Filters and other networks

References

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      • J.S. Martens , V.M. Hietala , T.E. Zipperian , D.S. Ginley , C.P. Tigges , G.K.G. Hohenwarter . A reflective microwave switch made of Tl-Ca-Ba-Cu-O for signal controlapplications. IEEE Microw. Guided Wave Lett. , 10 , 291 - 293
    2. 2)
      • Raihn, K.F., Fenzi, N.O., Soares, E.R., Matthaei, G.L.: `An optical switch forhigh temperature superconducting microwave band reject resonators', 1995 IEEE MTT-S Dig., 1995, p. 187–190.
    3. 3)
      • Jian Lu, , Xiangyang Ren, , Qishao Zhang, : `A TE', 1994 IEEE SingaporeInt. Conf. Communication Systems, 1994, Singapore.
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      • G.L. Matthaei , L. Young , E.M.T. Jones . (1980) Microwave filters, impedance-matching networks, and coupling structures.
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