Researches On Some Key Techniques For Finite Difference Time Domain

The finite difference time domain method has established itself as an widely used computational electromagnetics technology, it’s an effective and versatile means for solving Maxwell’s equations. As the complexity of microwave circuits and multiple space structures grows, electromagnetic simulators are required to be more efficient. The research fields of the computational electromagnetics have changed to the compound algorithm.Finite difference time domain is widely used for the simplicity and ability to handle complicated geometries which come with the cost of significant memory and large execution time requirements. In response to this problem and in order to get a stable general transform matrix(GTM), stability of the spatial-filtered FDTD is analyzed and new subgridding algorithms of FDTD are introduced. The conception and method of general transform matrix(GTM) are introduced in this paper in order to get the scatter characters of the object more efficiently, it’s a useful extension and implementation of the GTM to FDTD. The combination of the GTM and FDTD can be used to extract the ingoing and outgoing parameters of the proposed area and can get the exact scatter field with the least information so as to improve the simulation efficiency.It is the first time to introduce the GTM to the FDTD in the paper and the characters of the scatterer are equivalent to the Huygens surface which is meshed with the RWG basis triangles. The outer fields can be derived directly by the time domain GTM. It can improve the speed of the computation of large scale structures which can’t be possible before only based on FDTD.