High-frequency electromagnetic field coupling to long terminated lines

In this paper, we present a theory for the problem of electromagnetic field coupling to a long line with arbitrary terminations, The theory is applica ble for the high-frequency plane wave electromagnetic field excitations, wh en the transmission line approximation is no longer valid. Analytical expre ssions are derived for the induced current along the line, and at the two-l ine terminals. The coefficients of these expressions are determined using a procedure based on the exact solutions of the integral equation for two si milar line configurations, but having a significantly shorter length. The m ethod is, therefore, particularly efficient when considering the electromag netic held coupling to very long lines, The advantage of the proposed appro ach is that, in contrast with transmission line approximation, it takes int o account high-frequency radiation effects. Furthermore, it allows a consid erable reduction in computation time and storage requirements with respect to conventional numerical solutions based on thin-wire approximation.