Source-proximity limitations in high-frequency code solvers for modeling conformal cylindrical arrays

The NECBSC high-frequency code solver is an efficient computational tool for solving electrically large problems. The features of the UTD-based algorithm in this solver is gainfully utilized to calculate the embedded element pattern of a 5×5 cylindrical dipole element array located before a PEC circular cylinder of electrical radius ka = 96.5. The central element of the dipole array which is kept at 0.257λ off the curved surface of the cylinder, is excited with other dipoles terminated in a matched load of 50Ω. Since NECBSC formally does not calculate the array mutual coupling, this is included by calculating the induced currents on the elements derived from a full-wave integral equation based solver, FEKO. Comparison against the available experimental data shows remarkably good agreement between NECBSC, FEKO in the lit regions. The FEKO and NECBSC yield different results in the deep shadow regions dominated by creeping waves, indicating the necessity of further investigations.