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The Study on Slot Coupling and Three-dimensional Subgridding Method

Author: ZhuZuo
Tutor: LiaoCheng
School: Southwest Jiaotong University
Course: Electromagnetic Field and Microwave Technology
Keywords: FDTD method Asian Grid Coupling Domain Decomposition Method
CLC: TN015
Type: Master's thesis
Year: 2005
Downloads: 176
Quote: 1
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Abstract


FDTD method is to calculate the complex electromagnetic scattering is an effective method . Based on the research objectives with local subtle , subtle use of the local sub- grid , while in other parts of the region are still calculated using the coarse grid. Thus, the computational domain with uniform fine mesh compared both to reduce the amount of computer memory and run-time , and can ensure adequate accuracy . This paper first reviews the FDTD Yee algorithm, including the finite-difference time-domain differential equations , stability conditions , numerical dispersion characteristics , absorbing boundary conditions. The incident plane wave set-up and calculations carried out preliminary studies to analyze the incident plane wave parameters (θ, φ, α) take special values ??, the incident plane wave in the grid space representation and interpolation approximate formula given incident plane wave parameters aperture coupled power influence . This article is a three-dimensional grid in case of Asia conducted a preliminary study . From Ampere's law and Faraday 's law , derived thin slot problem FDTD equations . In order to accurately and efficiently calculate the target cavity aperture surrounding electromagnetic scattering , the introduction of sub- grid . This paper presents the case of two kinds of three-dimensional theoretical analysis of sub- grid : Grid wave equation method Asia and sub- grid technology across media boundaries , and completed a corresponding program . Wave equation is the use of sub- grid wave equation to deal with coarse- grid boundary of Asia , sub- grid area required to surround the entire scatterers . For the media that span borders Asian grid , the paper global mesh - local mesh boundary surface interpolation formula discussed deduced ideal conductor across different thickness global grid - LAN interface when the cells around it interpolation formula to calculate the accuracy of the results and the results were compared uniformly fine grid and has been verified. This also studied the conditions given incident aperture aperture area and shape of the power coupled into the cavity of the body . Finally, domain decomposition technique for a preliminary study .

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