In this paper a recently developed provably passive and stable 3D FDTD subgridding technique, based on finite elements principles, is extended to Body-Of-Revolution (BOR) FDTD. First, a suitable choice of basis functions is presented together with the mechanism to assemble them into an overall mesh consisting of coarse and fine mesh cells. Invoking appropriate masslumping concepts then leads to...

We investigate the spectral properties of the Cartesian, cylindrical, and spherical perfect matched layer (PML) absorbing boundary conditions. In the case of the anisotropicmedium PML formulation, we analyze the analytical properties of the constitutive PML tensors on the complex !-plane. In the case of the complex-space PML formulation (complex coordinate stretching formulation), we analyze th...

In this paper, a finite difference time domain (FDTD) method is applied to investigate capabilities of an ultrawide band (UWB) radar system to detect and locate a breast tumor. The first part of these investigations concerns a phantom formed by a circular cylindrical plastic container with liquid and a small highly reflecting target. In the second part, a three-dimensional numerical breast mode...

In this paper, a new design of optical channel drop filter based on two- dimensional photonic crystal ring resonators with triangular lattice is proposed. The rods of this structure is silicon with the refractive index 3.46 and the surrounding environment is air with the refractive index of 1.The widest photonic band gap obtained is for filling ratio of r/a = 0.2. The filter’s transmission spec...

A linear stability analysis of the Rayleigh–Taylor instability RTI between two ideal inviscid immiscible compressible fluids in cylindrical geometry is performed. Three-dimensional 3D cylindrical as well as two-dimensional 2D axisymmetric and circular unperturbed interfaces are considered and compared to the Cartesian cases with planar interface. Focuses are on the effects of compressibility, g...

Here, we propose an optical filter and an optical power splitter based on two-dimensionalphotonic crystal all circular ring resonators. These structures are made of a square lattice ofsilicon rods with the refractive index n1=3.464 surrounded by air (with refractive indexn2=1). First, we have designed the filter and by using that, we designed a power splitter. Thetransmission efficiency and Qua...