The objective of the study is to develop an algorithm for automatic directional coarsening of anisotropic meshes based on the finest level mesh to provide coarser meshes for geometric multigrid. Characteristic parameters of the meshes are high aspect ratio (of order 10 near the profile). The meshes are assumed to have a layer structure in boundary-layer zones. The aim of the study is to design ...

The anisotropic perfectly matched layer (PML) defines a continuous vector field outside a rectangle domain and performs the complex coordinate stretching along the direction of the vector field. In this paper we propose a new way of constructing the vector field which allows us to prove the exponential decay of the stretched Green function without the constraint on the thickness of the PML laye...

We propose a novel high directive antenna based on 1-D cavity resonator which is composed of a layer of air and a layer of anisotropic left-handed material. Resonance conditions for such a cavity resonator are analyzed, and in the cavity, the resonant frequency is independent of the lateral thickness. A cavity antenna can be made ultra-thin based on the aforementioned property. DOI: 10.2529/PIE...

We demonstrate that a two-dimensional complete photonic band-gap (PBG) can be realized in a layered periodic structure with a double-layer unit cell containing an anisotropic left-handed metamaterial layer. A set of criteria is derived for the geometric and material parameters to realize a two-dimensional complete PBG in such systems, and a detailed phase diagram is given. We discuss the underl...

We observed that radio-frequency (rf) irradiation significantly enhances the c-axis resistance near and below the superconducting transition of the CuO2 layer in contact with a normal-metal electrode on the surface of Bi2Sr2CaCu2O8+x single crystals. We attribute the resistance anomaly to the rf-induced charge-imbalance nonequilibrium effect in the surface CuO2 layer. The relaxation of the char...