|时间: 2010-06-06||发件人: admin||消息来源: nano@seu|
题 目: Integral Equation Analysis of Wave Propagation in Periodic Structures
报告人： Prof. Jiming Song, Iowa State University
时 间： 2010年6月8日（周二）上午10:00-11:00
地 点： 东南大学(四牌楼校区) 李文正楼 6楼 614会议室
主 办： 东南大学毫米波国家重点实验室
IEEE AP-MTT-EMC Joint Nanjing Chapter
The integral equation approaches are developed to analyze the wave propagation in periodic structures. Firstly, an integral equation approach is developed to analyze the two-dimensional (2-D) scattering from multilayered periodic array. The proposed approach is capable of handling scattering from the array filled with different media in different layers. Combining the equivalence principle algorithm and connection scheme (EPACS), it can be avoided to find and evaluate the multilayered periodic Green’s functions. For 2^N identical layers, the elimination of the unknowns between top and bottom surfaces can be accelerated using the logarithm algorithm. More importantly, based on EPACS, an approach is proposed to effectively handle the semi-infinitely layered case in which a unit consisting of several layers is repeated infinitely in one direction.
Secondly, the integral-equation (IE) method formulated in the spatial domain is employed to calculate the scattering from the doubly periodic array of three-dimensional (3-D) perfect electric conductor (PEC) objects. The special testing and basis functions are proposed to handle the problem with non-zero normal components of currents at the boundary of one period. Moreover, a relationship between the scattering from the PEC screen and its complementary structure is established. In order to efficiently compute the matrix elements from the IE approach, an acceleration technique with the exponential convergence rate is applied to evaluate the doubly periodic Green’s function. The formulations in this technique are appropriately modified so that the new form facilitates numerical calculation for the general cases.