Goubau line
![Illustration from Goubau's patent showing the conductor and launchers](/Images/godic/202501/16/Goubau5437.gif")
![1955 article on Goubau feedline for UHF television antennas[3] showing line and cone launchers.](/Images/godic/202501/16/Goubau_line_antenna_lead-in_Radio_&_Television_News_April_19555437.jpg")
A Goubau line or Sommerfeld-Goubau line, or G-line for short, is a single wire transmission line used to conduct radio waves at UHF and microwave frequencies. The dielectric coated transmission line was invented by F. Harms in 1907 and George J. E. Goubau in 1950, based on work on surface waves on wires from 1899 by Arnold Sommerfeld. It is used as a feedline at UHF to link high frequency transmitters and receivers to their antennas, and in scientific research.