Variational Analysis of Ridged Waveguide Modes

Brief expressions of eigenvalue problems, nornral modes, and electric-field profiles for all odd TE and TM modes of ridged waveguides, and the guide wavelength and characteristic impedance for the TE/sub 10/ dominant mode, are presented in this paper. In this analysis, the computation time can be reduced by getting simple approximated variational expressions for eigenvalue equations by using a trial function which satisfies the right-angled edge condition of a ridge. These theoretical results are in good agreement with the experimental results and the several references employed.     

脊波导族的多极理论分析

本文提出用多极理论准解析法计算不满足多极理论展开条件的脊波导本征值问题,介绍计算二维Helmholtz方程边值问题的多极理论准解析法计算规则,实例计算结果表明：多极理论准解析法具有较高的计算精度,是计算复杂截面波导本征值问题的一种有效方法,可以很方便地应用于复杂截面波导工程问题的设计与计算。     

波导传播特性的二次FEM方法分析研究

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。     

Analysis of Slotted, Dielectrically Loaded, Ridged Waveguide

This paper considers a symmetrical double-ridged waveguide with an axial dielectric slab inserted into it. Series expansions are used to describe the waveguide fields. The method of moments is employed to provide a system of linear equations from which the propagation constant and the coefficients of the series expansions are obtained. from these quantities, the field distributions and power flow are determined and a characteristic impedance based on a power-voltage definition is computed. The calculated propagation constants are compared with measured values.     

Nonlinear Analysis of Elliptical Waveguide FEM Amplifier

A set of nonlinear three-dimension equations for the FEM amplifier with elliptical waveguide and planar wiggler is derived. Based on these equations, a universal numerical simulation program is developed independently. The characterisitics of this FEM including the evolution of power, saturation efficiency and bandwidth are investigated. Electron momentum spread and wiggler taper are also considered.     

非对称单脊波导的积分方程法分析

基于积分方程法的分析途径，本文提出计算任意截面柱形金属波导中主模和高次模的特征值和特征向量的数值方法。本文运用此方法对非对称单脊波导进行了深入的理论和实验研究，给出了该种波导的本征值、电中心线偏移量、壁电流分布、带宽特性、损耗和功率容量等的理论计算结果，这些结果对非对称单脊彼导共线裂缝阵天线单元设计有较高的实用价值。     

Ridged Circular Waveguide (Short Papers)

Characteristics of wave propagation inside a ridged circular waveguide are studied. The waveguide is a hollow, conducting circular cylinder with a pair of semicircular conducting ridges diametrically attached to its inside wall. Results of a perturbation analysis suggest that in this device a lower attenuation and a wider bandwidth than those of a conventional circular waveguide can be achieved. Certain numerical results are graphically presented.     

背脊波导移相器高次模特性研究

背脊波导移相器可以明显提高差相移效率,已引起广泛重视。对这种移相器的高次模特性研究得还不很彻底。本文采用行波展开法研究了这种器件的高次模特性,并指出背脊波导移相器无法令所有高阶模式都截止,但通过合理设计可以让高次模与主模的耦合很小,达到尽量减小高次模的目的。     

On the Complete Eigenvalue Solution of Ridged Waveguide

The complete solution of the ridged waveguide eigen-value problem is presented. The solution is obtained by the formulation of an integral eigenvalue equation which is subsequently solved numerically by application of the Ritz-Galerkin method. The significance of the eigenvalue spectrum is discussed and the modes are classified as either hybrid or trough modes. Equations are given for the electric and magnetic fields and a brief discussion of the edge singularity is presented. The theory is illustrated by computing the dominant eigenvalues and characteristic impedances of various unsymmetrical ridged waveguides.     

不对称脊波导截止波长的计算

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。     

太赫兹椭圆波导的主模衰减特性分析

对太赫兹波在椭圆波导中的Helmholtz波动方程进行研究,结合Mathieu函数,给出了在椭圆坐标系下电磁波的场函数,并最终获得太赫兹波在椭圆波导中的主模衰减特性。结果发现椭圆波导长轴和离心率越小,则衰减越大。     

Finite Element Analysis of the Field Patterns in Elliptical Waveguide

In this paper, finite element method is first used to discuss the field patterns in a hollow perfectly conducting pipe with elliptical cross section. The electrical field lines of the dominant TE mode as well as the magnetic field lines of the lowest TM mode are presented. The results are the same with literatures, and also give a correction to the field pattern of the lowest TM mode in elliptical waveguide.     

椭圆波导输出窗的仿真研究

从理论与仿真计算方面对一种新型的波导输出窗——椭圆波导输出窗进行可行性分析。结果显示在18～40 GHz频率范围内驻波系数在1.4以下,这充分验证椭圆波导窗作为螺旋线行波管输出窗的可行性。     

不对称脊波导宽边中心裂缝天线的设计

介绍了 ２８ 单元不对称脊波导宽边中心裂缝阵列天线的设计过程和试验结果。     

Modal-S-Matrix Design of Optimum Stepped Ridged and Finned Waveguide Transformers

Optimum stepped transformers from rectangular waveguide to ridged and all-metal finned waveguides are designed with the method of field expansion into eigenmodes, which includes higher order mode interaction between the step discontinuities. Computer-optimized design data are given for a Ku-band ridged waveguide prototype with a ridge width of 1 mm, as well as for Ku-band and E-band finned waveguide transformers with commercially available metal fin thicknesses of 0.19 mm and 0.1 mm, respectively, suitable for metal-etching manufacturing technique. The optimum designs achieve a minimum return loss of about 36 dB, or 34 dB for the whole Ku- or E-band, respectively. The theory is verified by comparison with measured results.     

Ridged Waveguide for Planar Microwave Circuits (Short Papers)

A TE-mode planar transmission line is analyzed. It has a cross section as a ridged waveguide where the ridges are very thin. It is easily fabricated by photoetching of copper-clad dielectric boards, but can also be made without dielectrics for low-loss applications. Thus, it can be integrated together with other planar transmission lines like, for example, striplines. Besides the simplicity in feeding by stripline, the guide can be made smaller than an ordinary rectangular waveguide. It has applications in filters, resonators, balun-transitions, antenna feeds, etc. The characteristic impedance of the transmission line and its free-space cutoff wavelength are calculated and given in a diagram.     

有限元法的脊位于窄边的脊波导特征值分析

提出用有限元方法分析位于窄边的脊波导主模的截止波长和场结构图以及单模带宽特性，推导出用有限元法计算相关参数的计算公式。编程计算了双脊、单脊和不对称脊波导的特征值，求解了三种脊位于窄边的脊波导的传输特性，并给出了截止波长和单模带宽曲线以及场结构变化。     

脊波导窄边开槽垂直阵元用于地面塔康圆柱面天线

脊波导具有截止波长增大使波导波长减小和单模工作波长范围加宽的特性,故将脊波导用于工作频带宽度达25％的塔康天线,能够解决存在的矛盾;并且脊波导的等效阻抗低,使做成的垂直阵元便于与幅控水平功分PIN调幅器间阻抗联接.脊波导窄边开槽垂直阵元在自身内部实现垂直功率分配和垂直相位分配,这样就省掉36个垂直功分器.这种垂直阵元由...     

6 ~ 18 GHz 脊波导宽带功率合成放大器

提出一种不通过波导脊背与微带导带接触来实现脊波导-微带射频信号过渡的新型电路,具有工作频带宽、插入损耗小、电性能稳定等优点,非常适合工程应用。通过对该非接触式脊波导-微带过渡与Lange 电桥进行理论分析与仿真计算,提出了一种可覆盖C/ X/ Ku 频段的宽带功率合成方法,并按照该方案在6 ~18 GHz 频段内设计了一种以脊波导为射频端口的高效率2 路功率合成放大器。实测结果表明,6 ~18 GHz 频率范围内的无源合成效率高于87%。采用该电路将典型输出功率12 W 的2 只MMIC 的输出功率合成,在6 ~18 GHz 频率范围内得到了高于20 W 的饱和功率输出,附加效率最高可达28. 9%。该宽带功率合成放大器以脊波导为接口,不但功率容量大,且便于采用脊波导功率合成器进行高效率二次合成,为6 ~18 GHz 更大输出功率的固态功放研制提供了解决方案。