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Direct-coupled resonator filters with improved selectivity

Direct-coupled resonator filters with improved selectivity

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A method is outlined whereby a narrow-band direct-coupled resonator filter may be derived from an elliptic-function low-pass prototype. The construction and performance of a three-resonator waveguide cavity filter designed on this basis is described.

References

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      • S.B. Cohn . Direct coupled resonator filters. Proc. Inst. Radio Engrs. , 187 - 196
    2. 2)
      • M. Borner . Mechanical filters with attenuation poles. AEU , 103 - 107
    3. 3)
      • R.M. Kurzrok . General three-resonator filters in waveguide. IEEE Trans.
    4. 4)
      • R.M. Kurzrok . General four-resonator filters at microwave frequencies. IEEE Trans.
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      • E.C. Johnson . New developments in designing band-pass filters. Electronic Industries
    6. 6)
      • SAAL, R.: ‘Der Entworf von Fitern mit Hihfe des Kataloges Normieter Tiefpasse’, Telefunken GmbH.
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      • J.K. Skwirzynski . (1965) , Design theory and data for electrical filters.
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