Multiconductor transmission lines irradiated by plane wave: An EM-reciprocity analysis methodology

This paper extends previous work on electromagnetic (EM) reciprocity theorem analysis from the single-conductor to the more general multiconductor transmission line (MTL) case. The focus is on the EM coupling problem of an ideal MTL above a perfectly electrically conducting ground when excited by a plane wave. The proposed methodology addresses mutual coupling effects and mismatched loads in the MTL. The expression for the current along the MTL in the test (radiation) state is derived, considering these factors. A novel calculation method for the induced voltage at the load is then introduced, assuming consistent coupling between different lines in both test and receiving states. Numerical examples validate the proposed EM-reciprocity method, offering an alternative approach for analyzing the field-to-line coupling problem in MTL model.