Electromagnetic susceptibility of a folded cable of finite thickness in a shielded enclosure to external excitation

A numerically efficient Fourier series approach to the analysis of a folded cable of finite thickness enclosed in a rectangular cavity is presented. T he electromagnetic susceptibility of the cable to external excitation is co nsidered by computing the electromagnetic fields that exist within the cavi ty enclosure, and the current response induced on the cable. The cable pene trating through the top face of the cavity is folded at right angle within it. This boundary-value problem is an idealization of a folded cable in som e shielded enclosure. The formulation is based on the Fourier series approa ch developed by the author. The current response on the cable is approximat ed by a truncated Fourier series. The current on the cable, in turn, result s in an electromagnetic field within the cavity which is associated with a triply infinite sum. By using the Fourier series technique, the unknown mod e amplitudes and hence the unknown Fourier coefficients are evaluated. Othe r information pertaining to cable-shielded enclosure problems can easily be derived from the current and the held distribution. Numerical results are presented to illustrate the effects of cable diameters on the current respo nse of the folded cable. A threshold value of the wire diameter is identifi ed below which the cable behaves like a thin one.