Numerical Modelling of Dynamic Electromagnetic Problems Based on the Time-Domain Finite Integration Technique

Abstract

Developing numerical methods to solve dynamic electromagnetic problems has broad application prospects. In computational electromagnetics, traditional numerical methods are commonly used to deal with static electromagnetic problems. However, they can hardly be applied in the modeling of time-varying materials and moving objects. So far, the studies on numerical methods that can efficiently solve dynamic electromagnetic problems are still very limited. In this paper, a numerical method called the time-domain finite integration technique (TDFIT) is extended to tackle this problem via the introduction of time-varying iterative coefficients. In order to validate the effectiveness of the proposed algorithm, three numerical examples are demonstrated, including two microstrip structures with a time-varying medium and a rapidly rotating structure. The numerical results reveal that the time-varying medium can induce a nonlinear spectrum shift, and the radar cross section (RCS) of a rapidly rotating structure is highly dependent on the rotating speed. The proposed algorithm opens a new avenue for the exploration of many intriguing phenomena in fundamental physics, including frequency conversion and magnetless nonreciprocity. Meanwhile, it can also lead to a wide range of promising practical applications, such as active electron devices, space-time metamaterials, and hypersonic vehicles.

Electromagnetic Compatibility Simulation of Missile-Borne Multi-Antenna System

“…There are currently two main methods for obtaining the coupling degree: Measurement and numerical simulation technique. Since actual measurement of the missile system often requires a significant amount of resources, and it is difficult to solve the problem in the early engineering stages, the increasingly mature electromagnetic numerical simulation is increasingly being applied in the practical engineering analysis [4][5][6][7][8]. Therefore, in this paper, an electromagnetic simulation model of a typical missile with multi-antenna system is established to analyze the electromagnetic compatibility of multi-antenna situation.…”