The invention relates to a coaxial conductor structure for interference-free transmission of a TEM mode of a HF signal wave within at least one band of n frequency bands forming in the context of a dispersion relation, with n as a positive natural number, with a) an internal conductor comprising a round cross-section having an internal conductor diameter Di, b) an external conductor which equidistantly radially surrounds the internal conductor having an internal diameter Da of the external conductor, c) an axially extending common conductor section of the internal and external conductor, along which in each case s rod-shaped structures having a rod diameter Ds, which electrically connect the internal conductor to the external conductor are provided at equidistant intervals p, wherein for a propagation of the TE11 mode along the coaxial conductor structure undisturbed by higher excitation modes which form at least in the form of a Ten mode within m frequency bands, the parameters Di, Da, Ds, p, s can be selected in such a way that i) a lower cutoff frequency fu(TEM) of the TEM mode propagating within a n >= 2th band is greater than or equal to an upper cutoff frequency fo(TE11) of the TE11 mode forming in the mth band +- a tolerance range deltaf, and ii) an upper cutoff frequency fo(TEM) of the TEM mode propagating within the n >= 2th band is less than or equal to a lower cutoff frequency fu(TE11) of the TE11 mode forming within the (m+1)th band +/- a tolerance range deltaf.