The cavity problem, formulated using a magnetic field integral equation (MFIE), can be solved by the iterative physical optics (IPO) method, the progressive physical optics (PPO) method or the hybrid boundary element method/wavelet transform method (BEM/WTM). In this paper, we focus on open-ended circular cavities with cylindrically periodic terminations. The cavity problem is formulated using an electric field integral equation (EFIE), based on the dyadic Green function technique, instead of an MFIE. The discrete Fourier transform (DFT) technique is applied by exploiting the periodicity of the termination to reduce the original computational size by a factor of with corresponding computational savings of a factor of , where denotes the number of blades in the cylindrically periodic termination. Two kinds of dyadic Green functions are derived to reduce the integral range in the EFIE, thus accelerating the scattering solutions for different cavity applications. The BEM/WTM method is combined with the DFT to obtain sparse impedance matrices that can be efficiently solved using sparse solvers. The proposed hybrid BEM/WTM/DFT technique provides an alternative means of effectively analyzing the electromagnetic (EM) scattering from large-size circular cavities with cylindrically periodic terminations. Numerical results are presented to demonstrate the merits of the method.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.