共查询到14条相似文献,搜索用时 15 毫秒
1.
Guidance of Surface Waves with Dielectric Waveguides Having Finite or Infinite Periodic Corrugations
Liu Huikan Dong Tianlin 《International Journal of Infrared and Millimeter Waves》2005,26(10):1389-1406
A planar open dielectric waveguide with periodic rectangular corrugations is investigated in the case that surface wave is
guided and propagates normally to the corrugation. Our approximate analysis with the propagation characteristics is to consider
a corresponding bounded waveguide problem in which perfect electric or magnetic walls are introduced, and the periodic corrugation
is regarded as consisting of step discontinuities connected by a length of uniform slab waveguide. By properly taking into
account of both surface modes and only a few non-surface-modes, and using conservation of complex power technique (CCPT) as
well as solution selection rule (SSR), we can readily derive propagation characteristics in the Bragg interaction region.
The calculated results show an excellent agreement with previously published ones. 相似文献
2.
The propagation of electromagnetic waves along open periodic, dielectric waveguides is formulated in the case that surface
wave is guided and propagates normally to the corrugation. Our approximate analysis with the propagation characteristics is
to consider a corresponding bounded waveguide problem in which perfect electric or magnetic walls are introduced, and the
periodic corrugation is regarded as consisting of step discontinuities connected by a length of uniform slab waveguide. By
properly taking into account of both surface modes and only a few non-surface-modes, a novel network approach is proposed
for characterizing step discontinuity based on the generalized conservation of complex power technique (GCCPT). Employing
solution selection rule (SSR), we can readily derive propagation characteristics in the Bragg interaction region. A number
of numerical results are shown to demonstrate the usefulness of our approach. 相似文献
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Jamshid Khorsandi Shahnawaz 《International Journal of Infrared and Millimeter Waves》2005,26(9):1317-1328
A novel realization of non-uniform semivectorial finite difference method for the analysis of semiconductor optical waveguides is presented. By using non-uniform mesh structure computer time is saved while the accuracy is maintained. Also, the accuracy of the results increased by balancing the coefficient matrix without increasing computation time. Calculation of all eigenvalues (real and complex) is enabled by the method. The results of the calculation are compared for uniform and non-uniform methods and for two different optical waveguides. It is indicated that accuracy of the result is mainly dependent on the mesh refinement near the material interfaces. It is also indicated that for small mesh size using non-uniform method is necessary while uniform method is useless due to huge computer time and memory needed. 相似文献
5.
Min Ma Jian Huang Zhiyuan Yu Tiguo Gan 《International Journal of Infrared and Millimeter Waves》2003,24(12):2181-2187
This paper presents a novel E-plane rectangular-waveguide filter with three metal irises in Ka bard. Comparing with the conventional E-plane waveguide filter with single iris, a great improvment has been made in stop-band of a band pass filter, and wider pass band compare to normal double metal irises waveguide filter. An analysis is given by mode match method and the conservation of complex power technique [1]. Computer-aided design of a new five-resonator Ka band band pass filter has been presented, good agreement has been observed between theory and measurement data. 相似文献
6.
L. Knisevskaja M. Tamoinien V. ugurov 《International Journal of Infrared and Millimeter Waves》2002,23(2):325-336
An open microstrip line with a two-layer substrate of SiO2 and Al2O3, employed in millimeter-wave range mikroelectronic devices, has been numerically studied. The dependences of the characteristic electrodynamical properties of this line upon its geometrical parameters were calculated. For computations, the method of singular integral equations in the quasistatic approximation was applied. Double complexity was introduced: with respect to time and to coordinates. This method allows taking into account even very large losses in the material of the microstrip line substrate. The computation algorithm permitted us to take into account the finite strip conductor thickness and substrate width. 相似文献
7.
近年来,沿面介质阻挡放电(SDBD)用作大气压下气流控制的等离子体激励器因其众多的优点受到了广泛的关注.然而,国内外对沿面介质阻挡放电及其应用的研究尚处于探索阶段,对其放电特性的影响因素缺乏规律性的认识.因此,对SDBD相关特性和影响因素进行研究具有重要理论意义和应用价值.本文使用频率5~20 kHz,峰值电压0~30 kV的可调正弦交流电源激励大气压环境下的SDBD装置.通过调节激励电压大小,研究了其与SDBD放电特性之间的关系,对等离子体放电电流、放电形貌、功率损耗、诱导气流以及机械效率进行了分析.实验结果表明,SDBD消耗功率、放电强度和诱导气流均会随着激励电压的增大而增大,但机械效率存在先增大后减小的趋势,说明等离子体流动控制中研究中存在最佳效率点. 相似文献
8.
Huizhou Wu Xiangbo Yang Yan Tang Xiaopeng Tang Dongmei Deng Hongzhan Liu Zhongchao Wei 《Annalen der Physik》2019,531(9)
A PT‐symmetric periodic structure with two‐material waveguide networks is constructed. In this study, how changing the number of cells affects the transmission properties is investigated. The results show that the PT‐unbroken (broken) region of the system is only determined by the cell structure, regardless of the number of unit cells. This means that any system has the same exceptional points (EPs), regardless of the number of cells and as long as the cell structure is consistent. In addition, it is confirmed that the coherent perfect absorbers and lasers (CPA lasers) occur in our model. The transfer matrix method is used to derive a sufficient condition for achieving the CPA laser point. A simple, effective formula for predicting the CPA laser state in an N unit cell system is derived. 相似文献
9.
根据金属光栅结构变化对TE波异常透射特性影响的研究需要,建立了相应的模型。应用时域有限差分(FDTD)方法分别计算了单缝结构、多缝结构、不同宽度和不同周期等结构下的透射分布特征。研究发现添加凹槽会对金属表面能量的传递起阻碍作用。透射频域宽度随薄膜宽度增加而增加。随着狭缝宽度的增加,透射率分布曲线包络线趋于平坦,主透射峰短波长侧透射曲线分布基本不变,而主透射峰及其长波长侧的透射曲线分布变宽。这说明宽度的变化影响了表面共振模式,从而影响透射的分布。单个狭缝的透射与多周期结构相比,透射率曲线几乎重合,表明狭缝对表面模式没有调制作用,各狭缝的透射相对独立。 相似文献
10.
Scattering Characteristics of Dielectric Periodic Structure Composed of Left-handed Materials with Arbitrary Oblique Incidence 总被引:1,自引:0,他引:1
Weihai Fang Shanjia Xu 《International Journal of Infrared and Millimeter Waves》2008,29(11):1060-1069
Scattering characteristics of monolayer and multilayer dielectric periodic structure composed of left-handed materials (LH-DPS)
with plane wave arbitrary oblique incidence are carefully analyzed using a method which combines multimode network theory
with the rigorous mode matching method. Our analysis results reveal that the arbitrary oblique incident angles and relative
position between different LH-DPS have great effects to the scattering characteristics of LH-DPS which different from the
situation of dielectric periodic structure composed of right-handed materials (RH-DPS). The reasons why the reflection characteristics
of the LH-DPS are totally different from those of the RH-DPS with arbitrary oblique incidence are also given. The present
quantitive investigation provides guidelines for the design of the monolayer and multilayer dielectric frequency selective
surfaces for millimeter wave applications. 相似文献
11.
The dynamics of spiral waves under the influences of periodic mechanical deformation are studied. Here, the mechanical deformation propagating along the medium with phase differences are considered. It is found that weak mechanical deformation may lead to resonant drift of spiral waves. The drift direction and velocity can be changed by the wave length of the deformation. Strong mechanical deformation may result in breakup of spiral waves. The characteristics of breakup are discussed. The critical amplitudes are determined by two factors, i.e. the wave length and frequency of the periodic mechanical deformation. When the wave length of mechanical deformation is comparable to the spiral wave, simulation shows that the critical amplitude is substantially increased. As the frequency of the mechanical deformation is around 1.5 times of the spiral wave, the critical amplitudes are minimal. 相似文献
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D. X. Wang Edward K. N. Yung R. S. Chen 《International Journal of Infrared and Millimeter Waves》2002,23(11):1659-1675
This paper presents a hybrid method, which couples the vector finite element method (FEM) and method of moment (MOM) for analyzing the field and current distribution of the millimeter wave circuits. The FEM is applied to handle the interior region of dielectric bodies and MOM is used to solve surface integral equations. Then, These integral expressions are coupled into the FEM equations through the continuity of the tangential fields across the connection boundaries. Simultaneously, the short-open calibration (SOC) technique is used for predicting accurately the scattering parameters of the circuits. Numerical results are well compared with those published in the previous literatures. 相似文献