Comparison of linear and quadratic hexahedral edge elements in electromagnetic scattering problems

In this article, performances of linear and quadratic hexahedral edge elements are compared in the context of electromagnetic scattering problems. The de-facto standard of 0.1λλ element size for linear elements is taken as a basis; and 0.3 to 0.4λλ-size quadratic element usage is proposed for a better accuracy level with dramatic reduction in computation time and memory. The proposed scheme is applied to some well-known practical problems.