Talk:Goubau line
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The Goubau-Line are not exclusively obtained from 3 dimensionnal horn antennas and used in UHF or Microwave Frequencies. They can be "launched" from planar structures like tapered Coplanar Waveguides (CPW) at much higher frequencies such as the Terahertz Band [1]. The dimension of the single metallic conductor is then typically 1µm.
[1] T. Akalin, A. Treizebré and B. Bocquet, “High Resolution Biosensor based on Surface Wave Transmission Lines at THz Frequencies”, 35th European Microwave Conf., 3-7 Oct. 2005, Paris, France