Response of circular symmetric multiconductor microstrip line to an electromagnetic field

The primary-secondary field idea is used to determine the response of a circular symmetric multiconductor microstrip line (CSMSL) to an external electromagnetic plane wave. The primary field is obtained analytically for the cases of oblique TM/sup z/ and TE/sup z/ polarized incidence. The secondary field is determined using excited multiconductor transmission line theory. The method is examined to obtain the effect of external illumination on a four-strip CSMSL and some useful results are obtained.