Abstract: A microwave conducting structure is described, in which a first electrically conductive layer, a first dielectric substrate with a first dielectric constant being arranged on the first electrically conductive layer, and at least one electrically conductive trace with a first width being arranged on or within the dielectric substrate are provided. A track of a second dielectric substrate having a second width being wider than the first width and a second dielectric constant being lower than the first dielectric constant, is arranged locally between the first dielectric substrate and the conductive trace so as to extend along the conductive trace such that the conductive trace operates electrically as being arranged on the second dielectric substrate.