Hence, they were discussed as an alternative to traditional, two-conductor transmission lines. These coated wires, named Goubau lines in later years, showed low loss and weak dispersion. Goubau discovered that by coating wires in dielectric or corrugating the wire’s surface, the fields’ lateral confinement could be drastically enhanced 2. However, due to the large lateral extent of the fields at low frequencies, practical applicability seemed limited at first. Surface waves (SW) on circular conducting wires have been of theoretical interest since their discovery by Sommerfeld 1. The analytic model reveals that the propagating mode of a planar Goubau line is hybrid in contrast to the transverse magnetic mode of a classic Goubau line.
Finally, insights gained from the model are considered for a Goubau line with a rectangular conductor. Moreover, validation against experimental phase velocity measurements is also reported.
In addition, the spatial distribution of the longitudinal electric field is reported and excellent agreement with a numerical simulation and previous studies is found. The dependence of the propagation constant on various system parameters is calculated and the results agree well with full numerical simulations. An approximate equation for the propagation constant is derived and solved through numerical integration. This paper analytically investigates the surface wave mode propagating along a planar Goubau line consisting of a perfectly conducting circular wire on top of a dielectric substrate of finite thickness but infinite width. However, to date only numerical simulations and experimental measurements have been performed. Planar Goubau lines show promise as high frequency, low-loss waveguides on a substrate.
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