Graphene is renowned for its excellent chemical, thermal, mechanical, electrical, and optical properties, which arise from unique bonding structure. However, graphene intrinsically a zero-bandgap material, limiting development in the field of flexible nanoelectronics. To expand range applications electronic devices, it crucial to develop strategies inducing bandgap. One most effective methods chemical doping. Doping not only alters properties by modifying inherent gapless nature but also...

A nuclear electromagnetic pulse (NEMP) is the fourth effect of a explosion, characterized by strong field that can instantly damage electronic devices. To investigate spatial value distribution characteristics source region low-altitude NEMPs, this study employed finite-difference time-domain (FDTD) method based on rotating ellipsoidal hyperbolic coordinate system. Due to intense variations near explosion center, non-uniform grids were for both and temporal steps, an OpenMP parallel...

This paper presents a parallel ray tracing (RT) algorithm based on graphic processing unit (GPU) applied to electromagnetic scattering calculations in an inhomogeneous plasma enhance the computational efficiency of algorithm. The proposed utilizes fourth-order Runge–Kutta method solve Haselgrove equation track paths within and implements RT procedure using GPU. By independently assigning single threads rays originating from vertices midpoints each triangulated tube, substantial number are...

Since the time step of traditional finite-difference time-domain (FDTD) method is limited by small grid size, it inefficient when dealing with electromagnetic problems multi-scale structures. Therefore, explicit and unconditionally stable FDTD (US-FDTD) approach has been developed to break through limitation Courant–Friedrich–Levy (CFL) condition. However, eigenvalues eigenvectors system matrix must be calculated before iteration in US-FDTD. Moreover, eigenvalue decomposition also consuming,...

A 2-D hybrid method combining cylindrical explicit and unconditionally stable finite-difference time-domain (CEUS-FDTD) with traditional FDTD (C-FDTD) methods is proposed to analyze the electromagnetic structures efficiently. The unconditional stability of achieved by eliminating unstable modes which are obtained solving eigenvalue problem system matrix. However, global time-consuming. To solve this, domain divided into CEUS-FDTD region C-FDTD analyzing spectral radius one single grid. All...

We address the electromagnetic problem involving small structures, and put forward an improved, explicit finite-difference time-domain (FDTD) algorithm based on Newmark discretization with subgridding technique. This achieves a stable, low-reflection, straightforward arbitrary grid refinement ratio by adopting hanging variables. The method is employed to discretize numerical system generated method. Besides, Neumann series used obtain inverse of coefficient matrix. It makes time-marching...

A subgridding unconditionally stable finite-element time-domain method based on local eigenvalue solution (SUSL-FETD) is proposed to solve multiscale modeling. In this method, elements are used discrete a computational domain, and the explicit central-difference applied for temporal discretization. Compared with traditional elements, have more complex distribution of edges nodes. Therefore, an efficient scheme given form element matrix each element. Such system matrices assembled by all...

A novel hybrid finite-element time-domain (FETD) algorithm is proposed to solve electromagnetic modeling with fine structures. This based on the unconditionally stable FETD (US-FETD) and traditional methods. The US-FETD used in subdomain containing all grids parts of coarse adjacent grids. applied other subdomain. compensation correction scheme update fields boundary. can make explicit time marching a uniform step determined by entire computational domain. In addition, unstable modes system...

A new hybrid Finite-Difference Time-Domain (hybrid FDTD) algorithm is proposed in this paper. This FDTD method combines the superiorities of explicit unconditionally stable (US-FDTD) and traditional methods to achieve unconditional stability high calculation efficiency. US-FDTD used fine grids adjacent coarse subdomain it breaks Courant-Friedrich-Levy (CFL) condition. Traditional remaining a matrix free method. compensation scheme on boundary without compromising accuracy. Hybrid makes time...

A novel domain decomposition-finite difference time (DD-FDTD) method is proposed to improve the computation efficiency of traditional finite (FDTD) in calculating composite scattering from a target above rough surface. In this scheme, and surface are placed into subdomain subdomain, respectively. The incident waves including directly illuminated wave nonplanar reflected surface, introduced by invoking Huygens' principle equivalence principle. FDTD executed each obtain fields contribution...

In this letter, a spatial modes filtering finite-element time-domain (SMF-FETD) method combined with dual-field domain decomposition (DFDD) is proposed for analyzing 2-D electromagnetic structures fine features. The SMF-FETD can obtain unconditional stability by removing unstable modes. Thus, large time step available in the though features exist. However, global eigenvalue solution required method, which brings great burden on computing memory and time. To solve problem, DFDD technique...

Due to the limitation of stability condition, finite-difference time-domain (FDTD) method cannot efficiently deal with electromagnetic problems containing fine structures. The explicit and unconditionally stable (EUS) FDTD can eliminate constraint condition improve simulation efficiency structures by filtering out unstable modes for system matrix. However, EUS-FDTD needs solve eigenvalues numerical matrix, symmetry matrix be ensured when subgridding scheme is used discretize targets existing...

To analyze the transmission characteristics of multilayer metal mesh structures, a significant amount memory and calculation time are frequently needed for construction models with fine structures numerical calculations. In this paper, scheme single-layer homogeneous media equivalent is proposed. Firstly, permittivity given parameters (the diameter wire, aperture size, spacing between layers) determined by combining analytical model shielding effectiveness meshes genetic algorithm. Then,...

The remarkable properties of magnetic nanostructures have sparked considerable interest within the biomedical domain, owing to their potential for diverse applications. In targeted drug delivery systems, therapeutic molecules can be loaded onto nanocarriers and precisely guided released body with assistance an externally applied field. However, conventional external fields generated by permanent magnets or electromagnets are limited finite field gradients, shallow penetration depths, low...

Aiming at the inefficiency caused by optimal design of rotationally symmetric horn feed models, a fast modeling method for structures is proposed, which used to deal with mesh generation and rapid establishment computational models. In this paper, body-of-revolution finite-difference time-domain (BOR–FDTD) employed investigate radiation performance feed. Due rotational symmetry antenna, only requires two-dimensional cross-sectional An optimized Delaunay triangulation algorithm combined...