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A simulation procedure to examine the backscattering radar cross-section (RCS) of a hypersonic object with plasma sheath is presented. Computational fluid dynamics tool is adopted to resolve the distributions of electron density and atmospheric temperature, and then the complex dielectric constant of plasma sheath are found. Volume-surface integral equation method is employed to extract the backscattering...
A nonperturbative and universal FDTD model is proposed to investigate the nonlinear responses from metallic metamaterials. By coupling the hydrodynamic equation to the Maxwell equation, the multiphysics model enables to investigate both linear and nonlinear dynamics of free electron gas within the metallic metamaterials without any approximations and prior assumptions. Moreover, the proposed FDFD...
Thermoelectric coupling finite element model of 150A/75mV shunt was established, and temperature rises of them when the measuring current was over range were analyzed. Electromagnetic finite element model of shunt was established, And electrodynamic forces on manganin sheets of shunt were analyzed. Then, the measurement errors were estimated according to the results of temperature rises and electrodynamic...
Computational electromagnetics (EM) as well as multiphysics (MP) methods remain very challenging tasks even with nowadays. This talk will give a brief outline from CEM to CMP. Further, their applications for solving various complex electromagnetic environmental effect problems will be addressed. In particular, main challenges in the development of MP algorithm will be indicated and key strategies...
Electromagnetic problems with conducting-dielectric media are formulated by volume-surface integral equations. The conducting part is described with surface integral equations while the dielectric part is governed by volume integral equations, and they are coupled each other to form volume-surface integral equations (VSIEs). Conventionally, the VSIEs are solved by the method of moments (MoM) with...
To solve the signal separation problem in the integration system of radar and communication, a signal model based on random stepped frequency Orthogonal Frequency Division Multiplexing(OFDM) radar pulses is proposed, where the communication data is modulated on the radar pulses. The target range image can be acquired from the correlation of the echo and the reference signal, while the communication...
The objective of this paper is to present a brief review of a number of techniques for matrix preconditioning. Preconditioners are almost always needed when solving large problem by using the Method of Moments (MoM) [1], since the matrices associated with such problems are often ill-conditioned, and iterative techniques such as the Conjugate Gradient and GMRES algorithms either fail to converge at...
In this paper, the time domain volume surface integral equation method is used to analyze PIN diode Limiter under high voltage with a field-circuit coupling algorithm. Besides, the mathematical equations of lumped charge model are also combined here. The electromagnetic field-circuit coupled system matrix of microwave nonlinear element loaded circuit problem is established. With Newton iteration method,...
In this paper, by extracting the infinitely large term in the entries of the impedance matrices associated with the surface integral equations (SIE), an intuitive formulation of discontinuous Galerkin surface integral equation method is obtained. Non-overlapping trial and test functions defined on triangles are employed without requirement of the surface current continuity across their internal boundary...
Transient electromagnetic scattering by dielectric objects is formulated through time-domain electric field integral equations (TDFEIEs). The TDEFIEs are usually solved by combining the method of moments (MoM) in space domain and march-on-in-time (MoT) scheme in time domain. In the space-domain MoM, the magnetic current density is expanded by the n̂×RWG basis function and this could be problematic...
An improved locally one-dimensional finite-difference time-domain (LOD-FDTD) method is proposed for modelling graphene-based structures. The graphene sheet is considered as a polarization current source characterized by an auxiliary difference equation (ADE). Both intraband and interband surface conductivities of the graphene are modelled with the help of vector fitting technique. Such hybrid ADE-LOD-FDTD...
The near field radiation at the tip of a magnetized InSb cylinder is enhanced by tuning the external magnetic field. Cylindrical geometries that supports magnetized surface plasmon polaritons (SPPs) are proposed. In order to further enhance the near field strength at the tip of the cylinder, an improved geometry, i.e. the conical-cylinder structure, where a conical is attached at the top of the base...
The problem of eddy current generated by the gradient coil in superconducting MRI is discussed. A three-dimensional finite element model is set up to simulate the magnetic flux density generated by the eddy currents of the gradient coil in the patient region. A transversal gradient coil is designed and validated with the three-dimensional finite element method.
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