共查询到20条相似文献,搜索用时 31 毫秒
1.
Fuyong Xu Keyu Zhao Xuenong Tian 《Journal of Infrared, Millimeter and Terahertz Waves》2000,21(7):1119-1129
The transmission characteristics of the mode TE11 for a new type of closed trapezoidal-groove guide with arbitrary inclined angle are analysed in detail with the mode-matching method in this paper. The calculated results are in good agreement with the experimental values in the published reference. The dispersion of the closed trapezoidal-groove guide is very low. The relationships of the cut-off wavelength and the attenuation constant with the structural sizes of the closed trapezoidal-groove waveguide are also obtained. The given results have very important value in study, design, manufacture and application for closed trapezoidal-groove waveguide. 相似文献
2.
Fuyong Xu Keyu Zhao Bin You Xiaohui Lin 《Journal of Infrared, Millimeter and Terahertz Waves》2000,21(1):45-56
In this paper, the transmission properties such as the dispersion and attenuation characteristics for the dominant mode of the trapezoidal-groove waveguide with arbitrarily inclined angle are analyzed and discussed by using the mode-matching method. Some calculated results are in very good agreement with the published data. The obtained conclusions are of important significance in theoretical studies and actual applications of trapezoidal-groove waveguides for millimeter and submillimeter waves. 相似文献
3.
Fuyong Xu Keyu Zhao Bin You Xiaohui Lin 《Journal of Infrared, Millimeter and Terahertz Waves》1999,20(10):1825-1835
In this paper, the dispersion, cut-off and attenuation characteristics of trapezoidal-groove guide are analyzed by using the mode-matching method. The relationships between the guided parameters and variations of relative guide's sizes are discussed in detail. The calculated results are in good agreement with those in relevant reference. So, the obtained conclusions have important values in theoretical studies and actual applications of trapezoidal-groove guides for millimeter and submillimeter waves. 相似文献
4.
Mai Lu Fulin Wei Zhuoxiang Ren Zheng Yang 《Journal of Infrared, Millimeter and Terahertz Waves》1999,20(4):645-654
The structure of closed trapezoidal-groove guide is similiar to that of open one, but it can be used to prevent energy from leaking out of the guide. In this paper, the propagation characteristics of dominant mode in closed trapezoidal-groove guide are analysed by using finite element method and the results are discussed. 相似文献
5.
The arbitrarily open trapezoidal-groove guide is analyzed with the conformal mapping technique. A new formula is given for the evaluation of one fundamental parameter associated with the technique. The relationship between the cut-off wavelength for the dominant mode and the geometry of the guide structure is studied; dispersion characteristic of the groove guide is also given. Some numerical results are shown to be in good agreement with both experimental data and the results of the finite element method (FEM). Moreover, it is testified that dispersion of the trapezoidal-groove guide is low. The obtained results are significant for the design and application of the open trapezoidal-groove guide for millimeter waves. 相似文献
6.
Mai Lu Zheng Yang Fu-Lin Wei 《Journal of Infrared, Millimeter and Terahertz Waves》1998,19(3):529-541
In this paper, the propagation properties such as the dispersion characteristics, cut-off wavelength, guide wavelength and field distribution for the main mode of trapezoidal-groove guide are analysed by using the finite element method. The dispersion is very low, and the field distribution in a trapezoidal-groove guide is similar to that of rectangular one. The results have important values in design, manufacture, and application of groove guides. 相似文献
7.
Fuyong Xu Keyu Zhao Ling Zhao 《Journal of Infrared, Millimeter and Terahertz Waves》1997,18(6):1307-1315
An advantage of closed groove guide over open groove guide is attended. In this paper, the several kinds of closed groove guides including the trapezoidal-, elliptic- and parabolic-groove guides as new types of millimeter wave transmission lines are presented. Their dispersion and cut-off characteristics of the dominant mode are analysed and compared with ones of the closed V-and circular- groove guides by using the equivalent network method. The obtained results have important meaning in theoretical studies and actual applications of groove waveguides. 相似文献
8.
H. Zafar J. Zafar A. A. P. Gibson K. Masood 《Journal of Infrared, Millimeter and Terahertz Waves》2009,30(2):159-171
Renewed interest regarding the exploitation of dielectric loaded waveguides in high gradient accelerator structures requires
a closed form field formulation as cut-off frequencies and optimisation are problematic for numerical methods. In this paper
we will present efficient closed form solution for generic slab loaded waveguide boundary value problems. This solution offers
flexibility in a sense that it can be further exploited to derive a Green’s function linking transverse field expressions
for planar structures. The developed solution is demonstrated for a twin slab E-plane slab loaded structure coupled to a Point
source emitter assembly. The emission characteristics of the point source emitter assembly are optimized to generate a high
intensity and focused beam to be fed to this E-plane slab loaded waveguide structure for beam acceleration. The field analysis,
mode nomenclature, modal hierarchy, modal bandwidth, cut-off plane, impedance plane and dispersion relations for this accelerating
structure is included for sake the of completeness. 相似文献
9.
10.
Vawter G.A. Smith R.E. Fuchs B. Wendt J.R. Hadley G.R. 《Lightwave Technology, Journal of》1996,14(2):169-172
A rib optical waveguide using the concept of optical cutoff to provide isolation between adjacent waveguides in a photonic integrated circuit is disclosed. Due to the evanescent nature of light propagation in cutoff waveguides, this cutoff mesa rib waveguide permits fabrication of single-moded rib waveguides with minimal self-interference and crosstalk by means of light guided in a remaining slab waveguide. Design rules are given and operation of a single-moded cut-off mesa rib waveguide and an MZI using this waveguide are demonstrated 相似文献
11.
全硅大断面脊形光波导传播特性的理论分析及实验结果 总被引:2,自引:0,他引:2
对当前硅光集成的研究焦点-制备大断面单模脊形光波导的单模条件,用有效折射率法进行分析,也计算了传播常数等性能参数。结果表明,有效折射率法有方法简明、结论确切的优点。它能同时给出单模区、多模区及截止区的条件,已有效指导了SIMOX及n/n+外延型两种单模脊形硅光波导的制备。文中最后给出了实验结果。 相似文献
12.
本文讨论了加鳍波导高次模的特性,并用传输矩阵(TLM)方法计算了前七个模式的截止波长,还指出了如何修正TLM方法的误差。 相似文献
13.
Fuyong Xu Bin You Yue-e Li Keyu Zhao 《Journal of Infrared, Millimeter and Terahertz Waves》2002,23(10):1545-1556
The modes TE and TM of arbitrarily trapezoidal-groove guide are analyzed by using the mode-matching method. The mode TE11 is the dominant mode of the trapezoidal-groove guide under different conditions. The bandwidth characteristic and the operation condition for the single dominant mode are discussed. The obtained conclusions are of very important significance in theoretical study and practical application of trapeziodal-groove guides for millimeter waves. 相似文献
14.
Rectangular waveguides, containing dielectric layers in the H-plane, are studied. Results on normalized phase constant, cut-off frequency, and attenuation constant under cut-off, are presented for lower-order longitudinal section modes. Data have been computed from characteristic equations obtained by the matching of the tangential field components at the dielectric interfaces. 相似文献
15.
介绍二次有限元法分析波导本征值问题的基本原理和计算过程,编制相应的程序,实例计算了矩形波导的截止波长,并与理论值进行比较,所获得的计算结果与相关文献中所报道的数据吻合较好,表明该方法的有效性和程序的正确性。而且在此基础上计算了几种背脊波导的截止波长,单模带宽,画出了波导的场结构。这些结果和计算数据将为背脊矩形波导器件的小型化提供指导,对工程设计具有一定的实用价值。 相似文献
16.
《Microwave Theory and Techniques》1977,25(11):874-885
Dielectric waveguides suitable for millimeter and submillimeter wave integrated circuits are analyzed by applying the generalized telegraphist's equations. The dielectric waveguides treated in this paper are the rectangular dielectric image line, the cladded rectangular dielectric image line, the insulated image guide, and the strip dielectric guide. Numerical results of the propagation constant, the power distribution, and the field configuration in these dielectric waveguides are presented. Values for the propagation constants obtained by our method are compared with other theoretical results. Although this work is based on a closed waveguide model, it may be applicable to wide classes of dielectric waveguides with arbitrary dielectric profiles and cross sections. 相似文献
17.
We discuss the effects of waveguide geometry on the radiation loss of tightly curved multimode dielectric waveguides. Three waveguide geometries are investigated: a ridge waveguide, a buried waveguide, and an interdiffused waveguide. We compare the effective index method with both semi- and full-vectorial method-of-lines analyses for these waveguide geometries. This comparison shows that the effective index method is accurate for curved waveguides except where the outer confinement region is in cut-off or, in the case of TM-polarization, for the ridge waveguide. In the latter case, the full-vectorial method-of-lines predicts a resonant feature of the TM-mode radiation loss of curved ridge waveguides; this is not predicted by either the semivectorial method-of-lines or the effective index method 相似文献
18.
A three-component vector finite-element formulation for modeling the propagation characteristics of partially filled, axially magnetized, gyromagnetic waveguides is described. Covariant-projection elements have been used to avoid spurious modes, and periodic boundary conditions have been implemented to improve numerical efficiency. The classic quadratic functional derived from the vector, curlcurl, magnetic field equation is suited to evaluating the cut-off planes of gyrotropic waveguides. A known field transformation is used to reformulate the functional in a form convenient for calculating phase constants. Cut-off and phase constant solutions are presented for both fully and partially filled, longitudinally magnetized, ferrite-loaded waveguides 相似文献
19.
Layered waveguides with lossless anisotropic layers in the polar configuration are analyzed through the unifying concept of a real self-adjoint operator. For a suitable definition of two-vector transverse eigenfunctions, general properties such as orthogonality and completeness relations are derived. The linear operator formalism is applied to closed waveguides inhomogeneously filled with anisotropic materials, including crystals and gyrotropic media. As an extension of the former theory to open waveguides, a grounded uniaxial dielectric slab with a coplanar optic axis is also analyzed: as for open isotropic waveguides, a complete spectral representation including the surface (proper eigenfunctions) and the pseudosurface modes (improper eigenfunctions) is presented 相似文献
20.
本文给出一种求解非均匀填充波导截止频率的新方法,称为网络模型分解法。文中首先利用区域剖分和电磁场的微分形式理论建立了该问题的拓扑填型及其相应的网络模型,然后利用电路理论中的网络分解节点分析法建立了计算非均匀填充波导截止频率的一般算法。最后将该算法应用于若干典型实例,验证了方法的可行性和有效性。 相似文献