摘要
本文提出一种改进的局部网格共形FDTD技术 (MLC FDTD)来分析波导宽边缝隙天线 ,包括辐射纵缝和辐射组合斜缝 .MLC FDTD不仅解决了局部网格共形技术的不稳定性因素 ,还针对缝隙边缘场的复杂性 ,部分修改电场的更新迭代方程 ,以提高计算精度 .此方法分析和实施都较简单 ,精度较高 .另外 ,本文是直接对工程中采用的圆头形缝隙进行分析 ,文中给出了等面积和等周长两种工程中常用的矩形头和圆头形缝隙等效方法的等效变换误差 ,结果表明 ,等面积等效的误差是很小的 .
A modified locally conformal Finite-Difference Time-Domain technique (MLC-FDTD) is presented in this paper,which is used to analyze the broadwall radiating slots in a finite wall thickness waveguide,including the longitudinal slot and the compound inclined slot.MLC-FDTD not only removes the instability of the original locally conformal FDTD algorithm,but also improves the computational accuracy by partly modifying E-filed update equations according to the complexity of the slot fringe fields.In this paper,we make a direct analysis of the bulletheaded slots by using MLC-FDTD,and give the equivalent errors of two kinds of equivalent methods frequently used in the engineering design,which are the equal-area and the equal-perimeter transformations from the squareheaded to bulletheaded slot.The result shows that the equal-area transformation is more accurate.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2003年第6期860-863,共4页
Acta Electronica Sinica
基金
国家自然科学基金重点项目 (No 69931 0 30 )
