FDTD-PWS法用于分析毫米波透镜天线焦面场  

Hybrid FDTD-PWS method for focal field analysis of lens antenna at millimeter-wave band

作　　者：张岩[1] 吕善伟[1] 苗俊刚[1] 李玉莹[2] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100083 [2]中国航天科工集团公司二院二十五所,北京100854

出　　处：《北京航空航天大学学报》2007年第6期682-685,713,共5页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金资助项目(60271012)

摘　　要：提出一种新的节省计算空间的FDTD-PWS混合算法,并应用于透镜天线的焦面场分析.首先采用FDTD(Finite-Difference Time-Domain)求解得到聚焦透镜天线的口面场的幅度和相位分布,再通过PWS(Plane Wave Spectrum)外推至焦平面,求解得出焦面场分布.根据天线场分布的对称性,将PEC(Perfect Electric Conductor)和PMC(Perfect Magnetic Conduc-tor)边界应用于FDTD的仿真过程,使仿真模型缩减为原模型的1/4,进一步节省了计算空间.应用于毫米波聚焦透镜天线的焦面场仿真分析,并对其焦面场进行平面近场扫描测试,将仿真结果进行探头补偿后与实验数据作比较,证明该方法是精确和高效的.A novel hybrid finite-difference time-domain （FDTD） method and plane wave spectrum （PWS） method was presented for analysis focal field distribution of lens antenna. Firstly, the amplitude and phase distribution in the aperture was simulated by the FDTD method. Moreover, the antenna model was reduced to 1/4 by the pertect electric conductor （PEC） and perfect magnetic conductor （PMC） boundary conditions. And secondly PWS method was applied to calculate the focal field distribution. In order to demonstrate the accuracy and efficiency of this new method, a lens antenna at millimeter-wave band was designed and simulated as an example. Then this lens antenna was measured by the planar-near-fields （PNF） method. Finally, the influence of the measurement probe was characterized also by the FDTD method and taken into account by the calibration. And it is found that the results of focal spot size obtained by the FDTD-PWS method are in good agreement with the experiment data by the probe compensation.

关 键 词：FDTD PWS FDTD-PWS混合算法 焦面场 透镜天线 

分 类 号：O441.4[理学—电磁学]