An efficient method for wide-band electromagnetic (EM) scattering properties analysis of three-dimensional arbitrarily shaped perfectly electric conductor (PEC) objects is proposed in this study. The electric field integral equation (EFIE) is solved by the method of moments (MoM) base on the loop-tree basis functions. The EM properties not only can be achieved accurately in high frequency band, but also in low frequency band within the desired bandwidth using loop-tree basis functions. To improve the computation efficiency, the Maehly approximation method is utilised. Compared with the direct solution method and asymptotic waveform evaluation technique, the proposed technique is found to be efficient in a broadband and wide angular domain with the lower central processing unit time required and without loss of accuracy.

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The efficient iterative method of moments and physical optics (EI-MoM-PO) hybrid formulation combined with the best uniform approximation is proposed to analyze the antenna array around the electrically large platform in this paper. In the conventional MoM-PO method, the computation of the mutual interaction matrix between the MoM and PO region is very time consuming. To facilitate the analysis of electrically large problems, the EI-MoM-PO method provides a possible way to avoid the calculation of the PO contribution in matrix form. On the other hand, the best uniform approximation is utilized to obtain the frequency response of antennas quickly and easy to be applied in EI-MoM-PO method. Finally, the frequency response of the bowtie antenna array around the electrically large platform is analyzed by the presented algorithm and the conventional one. Numerical results demonstrate the capability of the proposed technique.