Introduction: Ultra-wideband antenna arrays achieve operation over bandwidths of 4:1 or more. These arrays are traditionally costly due to high element counts. Wavelength-scaled arrays (WSAs) have the same aperture size and bandwidth as traditional ultra-wideband arrays, but have significantly fewer elements. Using scaled elements of three different sizes, an 8:1 bandwidth WSA has fewer than 18...

MKT0000528 › With recent improvements in the efficiency of integral equation solutions it is now possible to combine the integral equation procedure with the finite element method (FEM) in a hybrid Finite Element Boundary Integral approach (FEBI) [1]. In electromagnetics the FEM is a general purpose technique that solves for volumetric electric fields and can be used to accurately characterize ...

A Morley–Wang–Xu (MWX) element method with a simply modified right hand side is proposed for fourth order elliptic singular perturbation problem, in which the discrete bilinear form standard as usual nonconforming finite methods. The sharp error analysis given this MWX method. And Nitsche’s technique applied to MXW achieve optimal convergence rate case of boundary layers. An important feature s...

Hex-meshes have wide and important applications in scientific computing. Various methods have been proposed to tessellate a shape into a hex-mesh according to certain geometrical quality criteria (e.g. scaled Jacobian), which is usually not directly related to the downstream computing problem. This paper discusses such criteria on the elastic finite element analysis problem via analyzing the re...

Computing the backscattering of harmonic acoustic waves from underwater elastic targets arbitrary shapes is a challenging problem considerable practical significance. The finite element method well suited for discretization target, while boundary addresses radiation condition at infinity. A disadvantage integral that it yields non-unique solutions certain wavenumbers. This failure associated wi...