Chen Mingsheng

Total field and scattered field technique for fourth-order symplectic finite difference time domain method

Using symplectic integrator propagator, a three-dimensional fourth-order symplectic finite difference time domain (SFDTD) method is studied, which is of the fourth order in both the time and space domains. The method is nondissipative and can save more memory compared with the traditional FDTD method. The total field and scattered field (TF-SF) technique is derived for the SFDTD method to provide the incident wave source conditions. The bistatic radar cross section (RCS) of a dielectric sphere is computed by using the SFDTD method for the first time. Numerical results suggest that the SFDTD algorithm acquires better stability and accuracy compared with the traditional FDTD method.

Hybrid Lifting Wavelet-Like Transform for Solution of Electromagnetic Integral Equation

A hybrid lifting wavelet-like transform scheme is successfully applied to the solution of electric field integral equation using Rao–Wilton–Glisson basis functions. To speed up the matrix transform process, the lifting scheme is adopted. Numerical examples of different three-dimensional perfectly electric conducting objects are considered. Compared with the method of moments, the proposed matrix transform scheme can save considerable CPU time and memory.

Study on the transmission characteristics of a double layered complementary frequency selective surface

A new double layered complementary frequency selective surface (FSS) based on square ring is proposed. One side of the FSS is an improved type of square ring metal patch, and the other side is a complementary metal screen. The transmission characteristics of the proposed FSS are studied. Meanwhile, the incident wave with different incident angles or with different polarization modes are analyzed respectively. Numerical simulation and actual measurements have shown that the new frequency selective surface has improved stability for different incident directions and polarizations, and it will provide a valuable reference for the design of FSS complementary screen.

The asymptotic waveform evaluation technique based on lifting wavelet transform

The asymptotic waveform evaluation (AWE) technique based on fast lifting wavelet transform (LWT) was applied to the method of moments to solve combined-field integral equation (CFIE). The wide-band radar cross section of arbitrarily shaped two-dimensional perfect electric conducting objects was calculated. The employment of CFIE eliminates interior resonance problem. The numerical results presented in this paper were compared with the results obtained by the method of moments. It was shown that the computational efficiency was improved greatly.