计算周期性导波结构的时域有限差分方法  

FDTD Algorithm for the Periodic Guided Waves Structures

作　　者：许锋[1] 洪伟[1] 周后型[1] 

机构地区：[1]东南大学国家毫米波重点实验室,江苏南京210096

出　　处：《电子学报》2003年第6期937-939,共3页Acta Electronica Sinica

基　　金：国家杰出青年资金 (No 6962 51 0 2 )

摘　　要：本文提出一种计算周期性导波结构的时域有限差分方法 .由Floquet定理建立边界条件 ,在电场边界和磁场边界上两次使用Floquet定理 ,从而将计算域限制在一个周期结构内 ,并且在导波结构侧面引入吸收边界条件 ,保证了计算精度 .通过预先给出传播常数 ,经FDTD迭代计算 ,其谐振频率就是该传播常数所对应的工作频率 .A novel FDTD (finite-difference time-domain) method is presented for the analysis of electromagnetic wave propagation in periodic structures.The boundary conditions are set according to Floquet′s theorem for periodic structures.Floquet′s theorem is used twice on electric field boundary and magnetic field boundary.Thus,the computational domain is restricted to a single period,and the absorbing boundary condition can be used on the other boundaries.Maxwell′s system is then solved as an initial value problem on a FDTD grid for the prediction of the (eigen) frequencies of the propagating modes for a given value of the propagation constant.

关 键 词：时域有限差分法 FLOQUET定理 周期性导波结构 

分 类 号：TN015[电子电信—物理电子学]