FDTD全波分析缺陷地结构微带线的高效算法实现  

Highly-efficient FDTD method of full-wave analysis on the microstrip defected ground structure

作　　者：兰婧[1] 杨阳[1,2] 戴婧怡[1] 

机构地区：[1]南京航空航天大学电子信息工程学院,南京210016 [2]毫米波国家重点实验室,南京210096

出　　处：《重庆邮电大学学报（自然科学版）》2012年第4期426-430,466,共6页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金项目(60901007;61172024);毫米波国家重点实验室开放性实验项目(K200906)~~

摘　　要：缺陷地结构(defected ground structure,DGS)具有慢波、高阻抗等特性,是近年来微波电路设计领域的一个研究热点,在运用传统时域有限差分(finite-difference time-domain,FDTD)方法分析DGS时,因Courant稳定性条件其计算效率受限。提出将一种弱条件稳定的混合隐显式FDTD(hybrid implicit-explicit FDTD,HIE-FDTD)方法经变换应用于分析具有缺陷地结构的微带平面电路,同时用传统FDTD方法的仿真结果与该方法的结果做比较。数值结果表明,该HIE-FDTD方法显著节省了计算时间,是一种高效可行的算法。另外还提出了适用于该方法的吸收边界条件的具体实现方案。The defected ground structure （DGS） has slow wave, high impedance and many other characteristics. It is be- coming a research focus for microwave circuit design in recent years. The Courant condition must be satisfied when using the conventional FDTD method to estimate the DGS, which makes the conventional FDTD method inefficient. In this paper, the HIE-FDTD method which is weakly conditionally stable is transformed for analysis of microstrip DGS planar circuits, at the same time, the numerical results for the conventional FDTD method are also rendered for comparing and validation. Fi- nally, it shows that the HIE-FDTD method agrees very well with the conventional FDTD method and saves time remarkably. The absorbing boundary conditions for the HIE-FDTD method are also presented.

关 键 词：混合隐显式时域有限差分法 弱条件稳定性 缺陷地结构 边界吸收条件 

分 类 号：TN823[电子电信—信息与通信工程] TM15[电气工程—电工理论与新技术]