A closed form modeling of a Radar Cross-Section (RCS) prediction of OverHead Wires (OHWs) at mmWaves is presented. Using exact equations of a bundle of twisted strands (BTSs), accurately modeling the outermost layer of an OHW, first, cylindrical expansions of the Z-component of the incident plane wave are derived both for Transverse Magnetic (TM) and Transverse Electric (TE) modes. Using Maxwell equations in cylindrical coordinates, scattered fields are inferred and then closed forms of RCS are deduced in both modes. The proposed RCS modeling is simulated on OHWs Aluminum Conductor Steel Reinforced (ACSR) type at 3-mm, 2-mm, and 1-mm waves. The resulting RCSs vs incident angles well highlight Bragg peaks that characterize OHW signatures at mm-waves and are contrasted with previous published ones.
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