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High-directivity microstrip directional couplers

High-directivity microstrip directional couplers

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The letter describes a simple method for improving the directivity of side-coupled microstrip couplers an unmetallised piece of the substrate material is cemented on top of the microstrip structure. The measured directivity ranges from 30 to 40 dB. The couplers are fully compatible with normal microstrip techniques.

References

    1. 1)
      • T. Bryant , J. Weiss . Parameters of microstrip transmission lines and of coupled pair of microstrip lines. IEEE Trans. , 1021 - 1027
    2. 2)
      • A. Schwarzmann . Microstrip plus equations adds up to fast designs. Electronics , 109 - 112
    3. 3)
      • J. Hundewadt , R. Stahlmann . (1972) , Coupled microstrip transmission line parameters.
    4. 4)
      • W. Burkhardtsmeier , W. Buschbeck . Gekoppelte Leitungen mit gleicher und verschiedener Phasengeschwindigkeit der Gleich und Gegentaktwelle. Arch. Elektron. & Uebertragungstech. , 192 - 197
    5. 5)
      • E.M.T. Jone , J.T. Bolljahn . Coupled-strip-transmission-line filters and directional couplers. IRE Trans. , 75 - 81
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