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Wideband transition form conductor-backed coplanar waveguide to modified coplanar stripline using multiple substrates

Wideband transition form conductor-backed coplanar waveguide to modified coplanar stripline using multiple substrates

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The Letter presents a wideband and low-loss transition from conductor-backed coplanar waveguide to a modified, conductor-backed coplanar strip transmission line. The measured insertion loss is less than 1 dB up to 4.8 GHz and the return loss is greater than 12 dB. To reduce undesired modes two dielectric layers are used between the circuit and the conductor backing.

References

    1. 1)
      • Williams, F.: `Novel coplanar stripline: Design, characterization and applications', IEEE MTT Symp. Dig., 1992, p. 211–214.
    2. 2)
      • Shigesawa, H., Tsuji, M., Oliner, A.A.: `Conductor-backed slot line and coplanar waveguide: Dangers and full-wave analyses', IEEE MTT Symp. Dig., 1988, p. 199–202.
    3. 3)
      • J.S. McLean , T. Itoh . Analysis of a new configuration of coplanar stripline. IEEE Trans. , 772 - 774
    4. 4)
      • Shigesawa, H., Tsuji, M., Oliner, A.A.: `New surface-wave-like mode on CPWs of infinite width and its role in explaining the leakage cancellation effects', IEEE MTT Symp. Dig., 1992, p. 495–498.
    5. 5)
      • M.A. Magerko , L. Fan , K. Chang . Multiple dielectric structures to eliminate moding problems in conductor-backed coplanar waveguide MICs. IEEE Microw. & Guided Wave Lett. , 257 - 259
    6. 6)
      • Oliner, A.A., Lee, K.S.: `The nature of the leakage from higher modes on microstrip line', IEEE MTT Symp. Dig., 1986, p. 57–60.
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