共查询到20条相似文献,搜索用时 31 毫秒
1.
Mai Lu Paul J. Leonard Duo-Wang Fan 《International Journal of Infrared and Millimeter Waves》2005,26(5):739-749
The electromagnetic power coupling in symmetrical and asymmetrical double circular-groove guides have been analyzed by finite element method (FEM) in this paper. The electrical field patterns of the dominant mode and the first higher-order TE mode have been presented. The electromagnetic field of the dominant mode distributes with a concentration in the two grooves and the region between grooves as well for symmetrical double circular-groove guide, while it distributes with a concentration in the groove with larger radius for the asymmetrical double circular-groove guide. The electrical field patterns of the first higher-order TE mode in symmetrical and asymmetrical double circular-groove guide are also presented. The figures in this paper have important values in design of circular-groove guide power coupler for millimeter wave applications. 相似文献
2.
Transmission characteristics of several kinds of closed groove waveguides for millimeter waves 总被引:1,自引:0,他引:1
Fuyong Xu Keyu Zhao Ling Zhao 《International Journal of Infrared and Millimeter 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
3.
Finite-element analysis of dispersion and loss characteristics of groove guide with arbitrary shapes 总被引:2,自引:0,他引:2
Xu Shanjia Zhang Yaojiang 《International Journal of Infrared and Millimeter Waves》1993,14(5):1055-1068
The dispersion and loss characteristics of groove guide with arbitrary shapes are analyzed with high-order finite element method. The effectiveness and the reliablity of the method are verified by the experiments and the results obtained by other methods. Groove guides with various groove shapes, such as rectangular, triangular, parabolic, elliptic and cosine functions, are investigated systematically. The calculating results show that the dispersion of groove guide with different groove shape is almost the same, however, the loss characteristics is rather different; among them, V-shape groove guide has the lowest loss which is about half of the rectangular one. All the curves and the data given in this paper can be used in designing elements and circuits of the groove guide. 相似文献
4.
Network analyses for transmission characteristics of several kinds of curve-shaped groove waveguides 总被引:1,自引:0,他引:1
Fuyong Xu Keyu Zhao Ling Zhao 《International Journal of Infrared and Millimeter Waves》1996,17(10):1789-1798
In this paper, the several kinds of the novel curve-shaped groove guides including the whole elliptic-, whole cosine- and hyperbolic-groove guides as the new millimeter wave transmission lines are presented. The dispersion, cut-off and band characteristics of the dominant mode for the several kinds of the curve-shaped groove guides are analysed by using the equivalent network method with transverse resonance. The obtained results have important values in their theoretical studies and actual applications of the curve-shaped groove waveguides. 相似文献
5.
Yongmei Pan Shanjia Xu Kiyotoshi Yasumoto 《International Journal of Infrared and Millimeter Waves》2005,26(2):189-200
Loss and dispersion characteristics of groove guide are two practically important factors in the design for millimeter wave system consisting of groove guide. In this paper, a new method is presented for analyzing loss and dispersion characteristics of the groove guides with arbitrary groove cross-sections. The method is based on the combination of an equivalent active transmission line equation and the staircase approximation. Numerical results of dispersion and attenuation properties for some groove guides with different groove profiles are given. The effectiveness and practicality of the present analysis are confirmed by the data given in the literature.*Supported by the National Natural Science Foundation of China (No. 60171019)
and (No. 60371010) 相似文献
6.
Mai Lu Zheng Yang Fu-Lin Wei 《International Journal of Infrared and Millimeter 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 Mai Lu 《International Journal of Infrared and Millimeter Waves》1996,17(2):403-413
In this paper, the dispersion characteristics of the main mode for the trapezoidal-groove guides are analysed by using the approach of equivalent network with transverse resonance. The relationship curves between guide wavelength, phase constant and guide dimensions, frequency are obtained. The characteristics have important values in design, manufacture and application of groove guides. 相似文献
8.
A New Fourier''s Expansion-Differential Method for Analyzing Groove Guide with Arbitrary Shape 总被引:3,自引:0,他引:3
A new Fourier's expansion-differential method for analyzing groove guide with arbitrary shape is firstly presented in this paper. It is convenient to solve practical application problems of arbitrary groove guides. The calculated results of the guide wavelengths of typical groove guides are in good agreement with ones in references, and its computing precision is fairly high. Hence the computational correctness of the new method is verified. The new method has the advantages of clear conception, direct-viewing expression, simple and easily feasible computation, etc. So it is of important application values for enriching groove guide theory and is solving actual engineering application problems for millimeter waves. 相似文献
9.
Coupling performance of closed double circular groove guide 总被引:1,自引:0,他引:1
Ma Jianglei Yang Hongsheng 《International Journal of Infrared and Millimeter Waves》1995,16(4):817-822
Double circular groove guide is a simple structure which can be used to construct directional coupler. In this paper, the coupling property of two uniformly coupled circular groove guides is studied based on the transverse resonance analysing results of closed double circular groove guide.The project supported by National Natural Science Foundation of P.R. China 相似文献
10.
本文建立了Chodorow型耦合腔慢波结构的解析模型, 利用并矢格林函数结合矩量法求解了场匹配方程, 给出了色散方程和耦合阻抗的计算式, 并数值计算出一个X波段Chodorow型慢波结构的高频特性. 结果表明, 本文方法的色散特性以及耦合阻抗与仿真软件HFSS计算的结果有很好的一致性, 且计算效率更高, 同时精度远高于等效电路法, 对工程设计有好的参考价值.
关键词:
Chodorow型耦合腔慢波结构
色散特性
耦合阻抗
场匹配 相似文献
11.
Zheng-Rong Xu Yang Hong-Sheng Lu Zhong-Zuo 《International Journal of Infrared and Millimeter Waves》1995,16(3):665-673
The dispersion characteristics of symmetrical and asymmetrical double circular-groove guide are analyzed by using the method of weighed residuals (MWR) and the theoretical performance of the directional coupler based on double circular-groove guide is also presented.The Project Supported by National Natural Science Foundation of P.R.China 相似文献
12.
Shen Zhongxiang Hua Rongxi 《International Journal of Infrared and Millimeter Waves》1991,12(4):389-396
An improved solution to the dominant mode properties of groove guides of general cross section is presented in this paper. A novel differential equation is formulated and solved by numerical integration technique. Numerical results for single V-groove guide show good agreement with available measured values. Calculated results for the cutoff wavelengths of semicircular-groove and trapezoidal-groove guides are presented. 相似文献
13.
Jun Qian Yang Hongsheng Wenxun Zhang Lu Zhongzuo 《International Journal of Infrared and Millimeter Waves》1993,14(2):327-333
Groove guide is one of the waveguides that have been used at millimeter and submillimeter waveband. This paper analyzes arbitrary groove guides by means of the eigen-weighted boundary integral equation method that uses the eigenfunctions of a fictitious regular boundary as weighting functions. In comparison with the theoretical and experimental results published, the numerical results for rectangular, circular and V-groove guides using this method are exact enough with fast convergence and less calculation.The Project Supported by National Natural Science Foundation of P.R. China 相似文献
14.
Fuyong Xu Jiankong Xiao 《International Journal of Infrared and Millimeter Waves》2004,25(11):1685-1697
An arbitrarily cross-sectional groove guide is analyzed by using the method of lines and its characteristic equations are gives for TE and TM modes. Some numerical results show that correctness of the method of lines compared with the relevant results in the references is verified, and it is convenient to solve groove guide with arbitrary shape in practical application problems. A novel cocoon-shaped groove guide is firstly presented and its transmission characteristics are analyzed and discussed. The new type of cocoon-shaped groove guide has the good performances. The obtained results are of important application values in theoretical studies and practical applications of groove guides for millimeter waves. 相似文献
15.
Yanyu Wei Wenxiang Wang Guoqing Zhao Jiahong Sun Peng Zhou 《International Journal of Infrared and Millimeter Waves》1999,20(8):1581-1592
A new kind of helical groove structure, step-loaded groove waveguide is presented and analyzed in this paper. The dispersion equation of this structure is derived by means of a field-matching method. This equation may be reduced to the dispersion equation of helical ridge-loaded structure and rectangular one. In order to demonstrate the influence of the step on the dispersion properties, the comparison of the dispersion characteristics is made in these helical rectangular and modified rectangular groove structures. Form the analysis, it is shown that the step loading tends to reduce the dispersion of the helical groove circuit and the step-loaded structure has the weaker dispersion compared with the rectangular one or the ridge-loaded one. The effect of the step shape on the wave properties is also discussed under the deep groove case. The theoretical results explicitly indicate that the V-like step-loaded structure has the weakest dispersion in all step-loaded structures. 相似文献
16.
Hu Chi 《International Journal of Infrared and Millimeter Waves》2003,24(11):1999-2006
Semicircular groove guide is a kind of waveguide for millimeter waves. In this paper, a conformal mapping technique is used to analyze it. Several semicircular groove guides are calculated with the method. It is shown that their cutoff wavelength calculated by the method are very close to those calculated by the transverse resonance method. 相似文献
17.
建立了由掺Yb光纤激光器阵列、变换透镜、闪耀光栅和输出耦合镜组成的光束谱合成系统的光束传输模型.在考虑光栅角色散、光栅刻槽倾角误差和光栅衍射效率情况下,利用光线追迹法、衍射积分方法、光束非相干叠加原理和强度二阶矩方法,推导出高斯光束非平行倾斜入射到闪耀光栅的相位变化公式以及谱合成光束的光强分布解析表达式.分析了高斯光束非平行倾斜入射到光栅后,光栅角色散、光栅衍射效率和光栅刻槽倾角误差对掺Yb光纤激光器谱合成系统输出光束特性的影响.研究结果表明,谱合成光束具有与单根光纤激光器几乎相同的光束质量;光栅角色散对合成光束特性的影响可忽略;随着光栅刻槽倾角误差的增大,谱合成光束的光束质量明显变差;当光栅刻槽倾角误差较大时,必须考虑光栅衍射效率对合成光束特性的影响.
关键词:
掺Yb光纤激光器
非平行倾斜入射
光束谱合成
光束质量 相似文献
18.
Ma Jianglei Yang Hong-sheng Lu Zhong-zuo 《International Journal of Infrared and Millimeter Waves》1992,13(3):319-325
On the basis of the analysis of single circular groove guide, the field configuration of double circular groove guide has been investigated, its characteristic equation has been derived and its theoretical performances have also been discussed.The Project Supported by National Natural Science Foundation of P. R. China 相似文献
19.
20.
The electromagnetic power coupling in asymmetrical double-groove guide is analyzed by finite element method (FEM) in this paper. The electrical field patterns of the dominant mode and the first higher-order TE mode have been presented. The electromagnetic field of the dominant mode is distributed with a concentration of energy in the wide groove region, while the electromagnetic field of the first higher-order TE mode is distributed with a concentration of energy in the narrow groove region. The results in this paper have important values in design of groove guide power coupler for millimeter wave applications. 相似文献