Mode energy transfer along a circular open chirowaveguide

Mode energy transfer along a circular open chirowaveguide is analyzed. It is shown that the TE0 and the TM0 are the only unperturbed modes that undergo coupling processes and that if the guide is exclusively excited with the TE01 mode, or the TM01, or both, only these modes are dominant. The energy variation along the guide is then almost periodic and the distance at which the energy transfer is largest is of the order of the radius, making this device attractive as a TE → TM mode converter, especially when a cylindrical geometry is required in a specific circuit design.