共查询到14条相似文献,搜索用时 875 毫秒
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用有限元法分析任意截面槽波导 总被引:1,自引:0,他引:1
用有限元法分析了任意形状槽波导。在槽波导开放端口引进了吸收边界条件。对矩形槽波导、V形槽波导、圆形槽波导的分析表明,计算结果与实验值以及其它方法得到的结果有较好的吻合。 相似文献
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研究了多层印制电路板(PCB)中含有一个信号过孔的电源/地平面返回路径阻抗的频域特性,并分析采用添加短路过孔的方法减小多层PCB的输入阻抗.电源/地平面形成了径向传输线结构,反焊盘处的输入阻抗即为信号电流在电源/地平面间的返回路径阻抗.在电源/地平面外部边界施加PMC(完全导磁体)边界条件,在反焊盘处施加电流激励源,短路过孔轴向电场为零,采用高效的二维边界元法求解.计算了10GHz内电源/地平面返回路径的输入阻抗.结果表明:在两特性相同的平面之间添加短路孔可以降低输入阻抗,同时,电源、地平面的输入阻抗随频率变化交替呈现容性或感性,在反谐振频率处输入阻抗值可达几百欧姆,此外,在频率较低时输入阻抗可用静态电容或静态电感表示.采用基于全波分析的有限元软件验证了计算结果和计算方法的正确性. 相似文献
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Xue-feng Guo Hong-sheng Yang Li-cheng Cui Jing Yao 《Journal of Infrared, Millimeter and Terahertz Waves》2004,25(2):393-402
In this paper, finite-difference time-domain (FDTD) method is used to calculate the driving-point impedance of radial transmission-line in circular groove guide. A simple way is used to approximate the curvilinear metal boundary of circular groove guide. And perfectly matched layer (PML) is applied on the open boundary of circular groove guide. Fine-grid is used to calculate the EM fields in the radial transmission-line in which we are interest. Discretized wave equation is used to update the tangential electric field on the boundary of coarse- and fine-grid. At last, the driving-point impedances related to different diameter of the radial transmission-line are obtained from the ratio of the Fourier transform of the voltage to the Fourier transform of the current. 相似文献
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Licheng Cui Hongsheng Yang 《Journal of Infrared, Millimeter and Terahertz Waves》2003,24(9):1567-1576
Finite-difference time-domain (FDTD) method is used to calculate the driving-point impedance of the circular groove guide diode mount. A simple way is proposed to approximate the curvilinear metal boundary of circular groove guide. Discrete equations are obtained from the Ampere's law and Faraday's law. Perfectly matched layer (PML) is applied on the open boundary of circular groove guide. At last program is made to obtain the field components. The driving-point impedance can be achieved from the ratio of the Fourier transform of the voltage and the Fourier transform of the current. The cutoff frequency and field pattern of the dominant mode are also obtained with well agreement with the theoretical results, this verifies the validity of the FDTD program. 相似文献
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Hong-hui Yan Hong-sheng Yang 《Journal of Infrared, Millimeter and Terahertz Waves》1999,20(1):149-154
Using the Fourier transform and the mode matching technique, the circular groove guide is analyzed. While deriving a series of simultaneous equations basing on boundary conditions, we get the characteristic equation of this guide structure that is strict than those before. The numerical result shows that the approach presented in this paper has a good precision. 相似文献
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Yan Hong-Sheng Jun Qian Lu Zhong-Zuo 《Journal of Infrared, Millimeter and Terahertz Waves》1994,15(10):1721-1731
The variations in propagating characteristic of circular groove guide due to tolerance are analyzed by using eigen-weighted boundary integral equation method (EWBIEM). Theoretical analysis and experimental results show that as long as the tolerance of circular groove guide is not very large the variations in characteristic of circular groove guide are very small. 相似文献