Coaxial conductor structure

A coaxial conductor structure for interference-free transmission of a TEM Mode of a HF signal wave within at least one band of frequency bands forming a dispersion relation comprising:

• an inner conductor and an outer conductor which is spaced radially apart from the inner conductor;
• an axially extending common conductor section of the inner and the outer conductor, including a number n≧3 of electrically conductive ring-shaped structures, wherein each electrically conductive ring-shaped structure is disposed between the inner and the outer conductors, is radially spaced apart from both the inner and the outer conductors, provides an electrical path completely surrounding the inner conductor, the electrically conductive ring-shaped structures are disposed along the conductor section in a spatially separated periodic sequence providing equal spacing between each two adjacent electrically conductive ring-shaped structures and including a capacitive coupling between each two adjacent electrically conductive ring-shaped structures;
• the electrically conductive ring-shaped structures having an inner diameter which is greater than an outer diameter of the inner conductor;
• the electrically conductive ring-shaped structures each having an outer diameter which is smaller than an inner diameter of the outer conductor;
• the electrically conductive ring-shaped structures limiting an inner propagation channel to be between the inner conductor and the ring-shaped structures and an outer propagation channel to be between the ring-shaped structures and the outer conductor;
• and
• at least one of the electrically conductive ring-shaped structures is electrically connected with at least one of the inner and the outer conductors by a metallic conductor either in contact with the outer conductor and at least one ring-shaped structure or is in contact with the inner conductor and at least one ring-shaped structure or a switchable component is electrically connected to at least one of the ring-shaped structures and electrically connected to at least one of the inner and the outer conductors or is electrically connected to two electrically conductive ring-shaped structures adjacent to each other in a longitudinal direction.