The propagation properties of a plasma dielectric waveguide immersed in an external magnetic field are presented. The field components' expressions, eigenvalues and characteristic equations have been obtained. The variations of the propagation properties with plasma parameters, external magnetic field and frequency are discussed in detail on the basis of the method of separation of variables combined with the technique of Muller's calculating roots.

Scattering of a plane wave with linear polarization by a chiral-coating conducting sphere is presented. The expressions for the expansion coefficients of scattered fields and internal fields are obtained. The achiral-coating and the bare sphere limiting cases for these formulas are examined. The monostatic and bistatic radar cross-section (RCS) for three different chiral media: a lossless dielectric chirality, a loss dielectric chirality and a loss magnetic chirality are shown.

An new analytical technique for obtaining a complete set of reflection, absorption, and transmission coefficients for a stratified plasma slab is presented, named the scattering matrix method (SMM). The nonuniform magnetized plasma slab is modeled by a number of subslabs. Each subslab has a fixed electron density. The overall density profile across the whole slab follows any practical distribution function. Because the field in each subslab can be represented by the sum of the reflected and incident components, the partial reflection and transmission coefficients can be obtained by successively matching boundary conditions at all interfaces. The partial and total reflected, absorbed, and transmitted powers as the functions of the electron density, collision frequency, and electron cyclotron frequency for typical parabolic and exponential density profiles are investigated.

文中讨论了地球物理勘探中的随钻测量电磁传输信道激励方式及物理模型；应用改进的等效传输线法与电极法，研究了影响地面电极检测电压的信道参数，给出了随钻电磁信道最人可测深度与地层电阻率、工作频率及井场干扰噪声的关系。与实测数据比较表明，所用理论模型能较好地预测随钻电磁信道的主要特性。

An analytical technique, called the scattering matrix method, is developed to analyze the scattering of a plane wave from a nonuniform ferrite cylinder. It is proved that the derived formulas for nonuniform ferrite cylinders can be degenerated to the formulas for uniform ferrite cylinders published in the literature. The characteristics of scattering by ferrite cylinders with a linear profile are investigated versus applied magnetic fields and wave frequencies.

分析了等离子体圆柱波导中存在的一般模式。重点讨论了波导的传播特性随等离子体参数、介质参数、波导尺寸、工作频率的变化。导出了各种模式的模方程，并给出了相应的近似解的解析表达式。在极限条件下，导出的结果与文献所给的结果相一致。计算的结果表明，这种结构波导的传播特性可以通过选择适当的等离子体参数、介质参数以及波导的尺寸来控制。

The normal modes in overmoded plasma waveguide coated with a lossy material are analyzed, particularly for the variation of its propagation properties with plasma parameters, coating materials, dimensions of the waveguide and frequencies. The separate characteristic equations of normal modes are derived, and their relevant approximate solutions are given. The limit results are consistent with those given in literature. The analysis shows that the propagation properties of the overmoded plasma circular waveguide can be controlled by choosing proper plasma parameters, coating materials and waveguide dimensions.

The propagation characteristics of magnetoplasma waveguide coated with a finite thickness of dielectric material are presented. Because the boundary conditions at all interfaces can be represented by the matrix equations, the characteristic equation can be obtained by successively using the matrix manipulations. The dependence relations of attenuation and dispersion of the fundamental mode with plasma frequency, collision frequency, and electron cyclotron frequency are shown.

A novel three-layer neural network with knowledge-based neurons in hidden layer (NNKBN) has been applied to model the crossover discontinuities in stripline circuits. The NNKBN model is electromagnetically developed with a set of data that are produced by the fullwave finite-difference-time-domain method. Numerical experiments show that the NNKBN model has many advantages over the conventional multilayer perceptron model.

The propagation characteristics of a plasma waveguide with a finite thickness of cladding immersed in an external magnetic field are presented. The effects of the collision frequency, electron cyclotron frequency, plasma thickness of cladding on propagation constants are investigated. Numerical investigations show that the attenuation of the waveguide is an oscillating function of the plasma thickness of cladding and collision frequency.