Kedi Zhang

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An efficient hybrid algorithm that combines the finite-element time-domain (FETD) method with the generalized scattering matrix (GSM) technique is proposed to characterize the properties of wave propagation in highly resonant waveguide devices. To alleviate the problem of an extremely large number of time steps required for a highly resonant device, the(More)
The design and implementation of millimeter-wave full-band waveguide-based spatial power divider/combiner are presented in this paper. The divider/combiner is based on a compact waveguideto-microstrip (Wg-Ms) probe-array transition structure, providing full-band frequency coverage and low insertion loss. Efficient design and analysis method for this type of(More)
This paper presents an efficient method for analyzing the performance of dielectric radomes illuminated by phased array antennas with wide scanning angles using volume integral equation based on the method of moment (VIE-MoM). A concise relationship between the unknown electric density flux of VIE-MoM and the scanning angle is derived and applied to avoid(More)
An interface-enriched generalized finite-element method (IGFEM) is presented for accurate and efficient electromagnetic analysis of complex composite materials. Without using meshes that conform to the material interfaces, the IGFEM enriches the solution space at the material interfaces to capture the discontinuities of the field and its derivatives. Two(More)
An efficient parallelization of the dual-primal finite-element tearing and interconnecting algorithm (FETI-DP) is presented for large-scale electromagnetic simulations. To reduce global reductions, iterative solvers with an iterating classical Gram-Schmidt (ICGS) scheme and a communication-avoiding (CA) approach are respectively implemented for the(More)
An efficient parallelization of the dual-primal finite-element tearing and interconnecting algorithm (FETI-DP) is presented for detecting defects in large-area nanopatterned wafers. To reduce global communication, iterative solvers with an iterative classical Gram-Schmidt scheme and a communication-avoiding approach are implemented to solve the interface(More)
A surface integral equation (SIE) is presented for analyzing electromagnetic scattering from complex targets with anisotropic impedance surfaces. By employing both surface electric and magnetic currents as unknowns and weakly enforcing the anisotropic impedance boundary condition (IBC), the derived SIE exhibits good spectral property. The parallelized(More)
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