The Response of a Two-Wire Transmission Line Excited by the Nonuniform Electromagnetic Fields of a Nearby Loop

Equations are derived for the currents in the load of a two-wire transmission line illuminated by the nonuniform fields of a small coplanar loop. Since the derived equations contain complicated integrals requiring machine computation, an approximate solution, which is applicable to most coupling geometries and which greatly reduces the computational effort, is also developed. In a numerical example, the currents excited by the loop are compared with the currents excited by a plane wave.