High-Frequency Methods

摘要: Publisher Summary This chapter summarizes asymptotic high-frequency (HF) techniques and solutions for analyzing a variety of electrically large, electromagnetic (EM) scattering diffraction problems. These methods hence the are in sense that their accuracy increases as some characteristic dimension associated with scatterer becomes large increasing frequency. The serve to complement other primarily restricted low frequencies, such formal convergent eigenfunction expansions numerical solutions, which exhibit extremely poor convergence properties An important advantage HF is they can provide often closed form, complex problems exact analytical cannot be found currently available. summarized here those based on classical geometrical optics (GO) physical (PO), well modern extensions: theory (GTD); its uniform version (the UTD), (PTD), equivalent current method (ECM).