共查询到20条相似文献,搜索用时 9 毫秒
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《Microwave Theory and Techniques》1961,9(6):552-556
A method is presented for calculating the lowest cutoff wavelength of a new microwave transmission line, the "lunar line," which is formed by two eccentric circular metal tubes connected with a metal bar or tangential to each other. The lunar-shaped cross section is approximated by introducing a series of steps in the outer guide wall and by dividing the cross section into m fan-shape regions. Thus, the problem is reduced to one of a multiple-step waveguide and can be solved by introducing the angular parameter alpha/sub i/ for the individual regions. The radial boundary conditions require a combination of Bessel functions of noninteger order for each region. The common boundaries between regions give m integral equations that represent the total power in one region transferred into the next region. The integral equations are solved approximately by solving only the first terms of an infinite series expansion of the tangential electric field at the common boundary. The solution of the m-stepped waveguide results in a system of 2m equations containing 2m unknowns: the cutoff wave number beta/sub c/, the order of the Bessel function p/sub i/, and the angular parameter alpha/sub i/. A successive approximation method is applied to obtain the cutoff wavelength. The calculated value is in close agreement with experimental results. 相似文献
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The cutoff wavelength of dominant mode in unilateral finline is analyzed by finite element method. The cutoff wavelength can
be changed by adjusting the thickness of metallic fins and dielectric constant of dielectric substrate. Numerical results
provide in this paper have important values in practical applications. 相似文献
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微屏蔽传输线的分析与计算 总被引:1,自引:0,他引:1
微屏蔽线(MSL)是一种新型的平面传输线,其超高的频率响应和极低的色散特性,可望广泛地应用于各种毫米波电路中,本文把用于鳍线、微带线的谱域导抗法推广到这种半封闭的传输线中,分析、计算了两种微屏蔽传输线的色散特性。计算结果与有关的实验相吻合,为这种半封闭的新型毫米波传输线提供了一种有效的计算方法。 相似文献
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不对称脊波导截止波长的计算 总被引:9,自引:4,他引:5
将计算矩形波导和对称脊波导导内波长的横向谐振法推广用于计算不对称单脊波导的导内波长和电中心线对波导宽边几何中心线的偏置。介绍了为保证脊波导截止波长或导内波长不变的情况下,设计不对称脊波导的方法,并给出了一些计算结果和试验结果。 相似文献
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采用有限差分法利用Matlab求解了方同轴波导的特性阻抗和高次模的截止波长,并将数据与国外文献数据进行了对比,证明了有限差分法结合Matlab在分析简.单截面的同轴波导时是简单可行的,而且计算精度较高,通用性强,可以用于传输线工程问题的设计和计算。最后计算了矩形同轴线的相关数据用于与方形同轴线作对比。 相似文献
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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
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Mai Lu Paul J. Leonard Zhide Hu Zheng Yang 《Journal of Infrared, Millimeter and Terahertz Waves》2002,23(2):301-308
The single-mode bandwidth in rectangular-groove guides with different dimensions has been studied by finite element method. The actual single-mode bandwidth in a rectangular-groove guide is the same with a rectangular guide with the similiar dimensions. The dominant single-mode transmission in a rectangular-groove guide at millimetric waveband by adjusting the guide dimensions can only be an approximate one. 相似文献
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利用小波边缘检测的方法,通过对红外辐射能量与温度、波长关系的分析,推导出两个
具有普适意义的拐点波长位移公式,提出并论证了红外波长测温理论。理论证明,利用红外波长测温法测得的三个温度值具有互校性,可用来校验绝对黑体,并为红外测温提供了一种全新的方法。 相似文献
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用有限差分方法分析不对称脊波导中脊位置变化时对主模截止波长的影响。截止波长可以通过脊位量的调整而调整。并给出了一些计算数据。 相似文献
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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
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《Microwave Theory and Techniques》1966,14(4):175-183
Design curves for ridged rectangular waveguides of the usual aspect ratio of 0.45 were published by Hopfer following earlier work carried out by Cohn and Marcuvitz. This paper has been written to extend the design data to ridged rectangular waveguides of any aspect ratio. An analysis of the error introduced by proximity effects has shown these to be of the order of a few percent. 相似文献