共查询到19条相似文献,搜索用时 140 毫秒
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用多模网络与严格模匹配相结合的方法,对纵向填充一层、两层和多层手征介质的双平板中导模的反射和透射特性进行了分析和求解.分析中在横截面采用等效传输线,在纵向采用多模传输线方法,并且利用结构的对称性使得问题简化.对各种不同情形进行了数值计算,讨论了手征参数和波导结构的尺寸对反射和透射特性的影响. 相似文献
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本文利用半解析-半数值混合地复杂非均匀介质中单个和多个偶极层所激励的位场进行高效数值求解,并与有限元法结果及实验数据进行了对比验证,获得了满意的一致。该方法已被用于自然电位响应问题的精细建模与求解。 相似文献
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本文研究了一种可以高效求解任意非常规目标电磁散射的修正电场积分方程方法.借助磁场积分方程主值项的提取,加入到传统电场积分方程中,将传统的一次迭代求解过程转变成逐渐逼近真解的内外两层迭代.其外层迭代不断刷新电流,最终得到精确解.加入磁场主值项的修正电场积分方程显著降低了条件数,同时保留了原电场积分方程普适性强,可用于处理任意非常规目标的优点.对于每一外层迭代步中电流的求解,本文采用了加速矩阵矢量相乘的多层快速非均匀平面波算法,形成高效的内层迭代求解.数值结果表明,该方法在保证精度的同时,可以显著降低问题的求解时间. 相似文献
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利用多层快速多极子方法(MLFMA)分析三维导体介质复合结构的电磁辐射与散射特性.根据等效原理,介质表面构造Poggio-Miller-Chang-Harrington-Wu(PMCHW)方程,导体表面建立电场积分方程(EFIE).分析了含介质目标MLFMA算法中远区组矩阵矢量相乘运算以及有耗媒质空间中格林函数的平面波展开.利用该方法研究了涂敷目标电磁散射特性以及天线罩对直线阵天线辐射特性的影响.MLFMA的应用降低了计算量和存储量,实现了对电大尺寸目标快速、准确的求解. 相似文献
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传统的前栅极场致发射显示板由于介质层和栅极的制作在生成或制作阴极场致发射源之后,在制造过程中容易破坏场致发射源;另外阴极发射对介质层厚度、阳极电压和调制极开口等参数非常敏感,所以器件的发射均匀性难以保证。为了解决这些问题,引入了类似HOP玻璃的结构。阴极上只需要丝印碳纳米管,无需制作介质层和栅极,解决了场致发射源被破坏的问题。阴极与栅极之间真空取代了介质层,由于真空的绝缘性能高于介质层,所以阴极与栅极之间的距离可以减小,栅极的调制效果更显著。由于玻璃的平整度高于一般方法制作的介质层的平整度,所以器件的发射均匀性比较好。 相似文献
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V. G. Koshkid’ko 《Journal of Communications Technology and Electronics》2018,63(2):104-110
The problem of plane-wave excitation of an infinite array of slot impedance loads with a dielectric layer is considered in order to determine the equivalent surface impedance. The solution of the problem is found by the method of integral equations, solved numerically by the Krylov–Bogolyubov method, which reduces the integral equation to a system of linear algebraic equations. The numerical results are presented in the form of dependences of the equivalent surface impedance on the geometric dimensions of the structure at fixed values of the period of the array, the angle of incidence, and the thickness of the dielectric layer. It is shown that the equivalent surface impedance can be controlled by varying the width of the slot and the strip conductor. The dependences obtained are compared with the characteristics of an array of slot impedance loads without a dielectric layer. 相似文献
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The anisotropy of magnetostatic surface wave (MSSW) propagating in finite width YIG/dielectric/metal layered structure is analyzed. This problem is solved by finding the rigorous solution of each layer from Maxwell equation and the appropriate transmission Green's function matrix (G). From the relationship of Green's function matrixes of dielectric layer and ferrite layer, the dispersion equation is obtained.The MSSW filter is designed to verify the dispersion characteristics. The experiment results are in good agreement with the calculating data from the model. 相似文献
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《Microwave Theory and Techniques》1986,34(11):1226-1227
In the above paper, Butler et al. have investigated theoretically the propagation characteristics of the dielectric waveguide with plasma layer created by an exponentially absorbed optical beam. They have solved numerically the complex wave equation by using a multipoint boundary-value differential equation solver. On the other hand, we have already treated the same nonuniform layer model by using a multilayer staircase method [2]. In this approach, the actual permittivity profile of the waveguide is approximated by the finite number of steps. The wave equation is solved for each step and the complex propagation constant is determined so as to satisfy the boundary conditions at all interfaces. The mathematical formulation is very simple and an accurate solution can be obtained by increasing the number of steps M. The details of the method can be found in [3] and [4]. 相似文献
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A parallel-two-wire-transmission-line covered by a three layer media has particular transmission characteristics. It is expected that this type of line might therefore be applied to new microwave circuits and antennas. Such lines have been analyzed by solving Laplace equations as a two dimensional boundary value problem. However, at higher frequencies, it is not appropriate to explain these particular properties using the quasi-TEM mode analysis. Transmission theory for these lines has to be solved using a rigorous three dimensional analysis. in this paper, we describe a new three dimensional analysis technique that is used to obtain more accurate propagation constants by considering the EZ, HZ components of the field. The assumed current distribution of the parallel-two-wire-line system is Fourier expanded over the angular coordinate &thetas;, and the boundary value problem is solved by the mode matching technique. It is found that mainly hybrid modes are transmitted via this type of transmission system and that the propagation constant varies discontinuously at frequencies where the dipole mode can exist on the three layer dielectric media itself. Numerical results are presented and compared with experimental data 相似文献
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V. I. Ponomarenko I. M. Lagunov 《Journal of Communications Technology and Electronics》2017,62(7):765-769
The problem of reflection of a normally incident electromagnetic wave from a periodic structure of conducting grids with square cells, placed into a dielectric layer lying on a metallic mirror, is solved. It is shown that, with an appropriate choice of parameters, this structure can be low-reflecting in a wide frequency range. It is established that, if the grids are sufficiently fine, such a structure has a frequency-dependent reflection coefficient, which is similar to a structure with conducting films instead of the grids. The results of the work can be used to create low-reflection coatings used for various purposes in microwave technology. 相似文献
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P. Motte J. Torres J. Palleau F. Tardif O. Demolliens H. Bernard 《Microelectronic Engineering》2000,50(1-4):487-493
A challenge to integrate Cu in device interconnections is to avoid Cu diffusion into silicon active zone that could seriously damage device performance, and into interlevel dielectric that could induce shorts or degrade dielectric performance. This paper relates the integration of Cu-CVD with SiO2. Structures studied are SiO2 deposited on Cu-CVD, and SiO2/SiN/Cu structure: a thin SiN layer is deposited on Cu before SiO2 to act as diffusion barrier and as an etch stop during the interconnect structure patterning. Both SiO2 and SiN dielectric processes are made in plasma-enhanced chemical vapor deposition processes, from SiH4 precursor with addition of, respectively, N2O or NH3. Cu contamination is shown to occur during the dielectric deposition onto Cu, and is enhanced by the fluorine presence in the deposition chamber. Deposition processes were evaluated in order to lower Cu contamination in the dielectric bulk. On an other hand, a noticeable degradation in Cu layer resistance was evidenced after dielectric deposition due to copper contamination during the dielectric deposition process. This issue can be addressed by the optimization of the dielectric deposition process. 相似文献
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提出了一种适用于高速互连电路的信号完整性快速仿真方法。根据电流返回路径
不同,该方法将有过孔的三维互连结构分解为电源平面对阻抗模型和微带线模型,先单独分
析两种模型特性,再级联以求解整个互连结构特性。与全波仿真方法相比,本方法在保证准
确度的前提下可将仿真时间从95 min降低至1 min以内。分析了电路板参数、去耦电容和短
路孔对信号完整性的影响,结果表明插入损耗由电源平面结构在过孔位置处的自阻抗决定。
在工程设计中,可采用减小电源平面对结构厚度、添加去耦电容和选择适当的过孔位置等方
法提高信号完整性 相似文献