多手征介质填充圆波导的分析

本文利用递推本征函数法分析了多层手征介质填流圆波导的传播特性。文中给出了不同介质层中电磁场的递推关系，推导了Ｎ层手征介质填充圆波导色散特性的一般笥计算公式。作为示例，文中还给出了对几结构传播特性的计算结果。     

手征等离子体波导理论

本文给出了手征等离子体波导(由在柱形波导中填充手征等离子体材料构成)中横向场量与纵向场量之间的关系式,并给出了纵向场量的求解公式。作为示例,文中具体研究了平行板手征等离子体波导,得到了其中几个低次传播模式的色散特性曲线。     

电磁场与微波技术

044,TN814.5 94010864多层手征介质填充圆波导的分析/沈忠祥(南京航空学院)11电子科学学刊一1993,15(5)一546~550 利用递推本征函数法分析了多层手征介质填充回波导的传播特性.给出了不同介质层中电磁场的递推关系,推导了N层手征介质填充回波导色散特性的一般计算公式.作为示例,还给出了对几种结构传播特性的计算结果.图5参8(文)044 94010865UA加速间隙内横向场分析及对发射度的影响/章冠人(西南流体物理所)//强激光与粒子束一1993,5(2)一191~197 加速间隙是LIA漂移管中间突出的圆柱形空隙.在这空隙构成的空腔内,存在两种电磁场,一种为…     

手征等离子体波导理论

本文给出了手征等离子体波导（由在柱形波导中填充手征等离体材料构成）中横向场量与纵向场量之间的关系式，并给出了纵向场量的求解公式，作为示例，文中具体研究了平行板手征等离子体波导，得出了其中几个低次传播模式的色散特性曲线。     

手征等离子体填充圆波导的传播特性

本文在柱坐标系中导出了手征等离子体波导内横向场量与纵向场量之间的关系,给出求解纵向场量的波动方程.利用波导壁上的电场边界条件,建立了手征等离子体介质填充的圆波导传播常数的特征方程,计算得到了几种低次模式的传播常数随归一化波导半径及材料参数的一系列变化曲线,分析得出了若干有意义的结论.     

部分填充手征负折射率介质的平行板波导

部分填充手征负折射率介质的平行板波导中电磁波传输的导模特性进行了研究,给出了导模的场分布公式,推导出导模的特征方程.数值计算了导模的色散特性曲线、功率曲线和能流分布,探讨了手征负折射率介质层的厚度、手征参数等对导模特性的影响,发现了导模的一些奇异特性,如存在表面波模、功率流动方向与相位传播方向相反的后向波、功率储存、传播常数三值、模式交叉等现象,还发现此波导中存在电磁波传播的禁带.     

手征等离子本填充圆波导的传播特性

本文在柱坐标系中导出了手征等离子体波导内横向场量与纵向场量之间的关系，给出从向场量的波动方程，利用波导壁上的电场边界条件，建立了手征等离子体介质填充的圆波导传播常数的特征方程，计算得到了几种低次模式的传播常数随归一化波导半径及材料参数的一系列变化曲线，分析得出了若干有意义的结论。     

手征介质圆波导中阶梯不连续性的散射和辐射特性研究

采用多模网络与严格模匹配相结合的方法，对开放型手征介质圆波导中的二种阶梯不连续性的散射和辐射特性进行分析和求解，仔细讨论了手征参数和几何尺寸对散射和辐射特性的影响．给出的结果对手征介质元器件的研究有实际的参考意义．     

矩形手征波导中混合模的边元有限元分析法和传输特性研究

本文用矢量有限元－－边元法研究了手征波导的导波特性，与点元有限元法相比，用边元法分析手征波导模式有其明显的优越性，即不需特殊处理就可去除伪模，而且数值计算时可以节约计算机内存。本文以矩形手征波导为例，分析了全填充和部分填充手征介质时混合模的色散特性，讨论了手征导纳，波导尺寸等参量对混合模截止频率的影响，验证了边元法的有效性和正确性。     

具有径向导电面的多层介质圆波导的传播特性

采用分离变量的方法，推出了具有径向导电面、多层普通介质填充的圆柱波导各层电磁场之间的递推关系，得到了其模式场解，并进一步推出了此波导的本征方程。将其应用于只有一种介质填充情况，结果和有关文献相同。作为示例，文中给出了填充两层介质时，一些模式的色散特性的计算结果。     

Analysis of Circular Dielectric Waveguide with Chiral Cladding

The propagation characteristics of a circular dielectric waveguide with chiral media filled in the cladding are investigated. The relation between the cutoff frequency and the chiral admittance, the dispersion curves for some modes with different angular mode numbers and the transverse distribution of fields are presented. Some new features different from the ordinary circular dielectric waveguide are resulted. The results show that the cladding chirality may lead to a single-mode operation in the circular dielectric waveguide.     

Analysis of Circular Chiral Dielectric Waveguides

The general eigenequations and the field expressions for circular waveguides containing chiral material in both the core and the cladding are given in a simple formulation. The results indicate that there are two types of field distribution which is related to the operating wavelength and chiral admittance. When the chiral admittance is larger than a critical value, the fields of one kind of circularly polarized wave in the core become exponentially-like damping in the transverse direction. Based on the eigenequations, the characteristics of a circular waveguide with chiral medium filled in the core are investigated. The relation between the cutoff frequency and the chiral admittance, the dispersion curves for some modes with different angular mode number and the transverse distribution of fields are presented. Some features different from the ordinary circular waveguide are resulted.     

Propagation characteristics of a circular waveguide filled with a chiroferrite medium

A chiroferrite is made from chiral objects immersed in a magnetically biased ferrite. A waveguide including a chiroferrite is anticipated to possess some novel features due to the presence of chirality in combination with anisotropy. In this paper, the propagation characteristics of a circular metal waveguide filled with a chiroferrite medium are investigated by an analytical procedure. The equations of relations between the transverse components and the longitudinal ones of electromagnetic fields in general chiroferrite waveguides are derived in a cylindrical coordinate system. The coupled wave equations for the longitudinal electric and magnetic fields are decoupled into two Helmholtz equations which are then solved analytically. The characteristic equation is formulated for the circular chiroferrite waveguide. Propagation constants varying with the structural and material parameters have been calculated for several lower chiral modes. A number of interesting features have been revealed by the numerical results.     

Attenuation characteristics of a circular chirowaveguide

The attenuation constant of a circular waveguide completely filled with a homogeneous, isotropic and lossless chiral medium is calculated after first solving the wave equation and determining the field components. The waveguide supports only the hybrid modes and the first modes with azimuthal indices of 0 and 1 are studied.<>     

回旋媒质偏心加载圆波导的传输特性

利用基于Bessel函数加法定理的坐标变换,获得了关于回旋媒质偏心加载圆波导中传播常数的特征方程.文中给出了回旋介质棒偏心加载圆波导时的色散特性曲线,并讨论了传播常数随各参数的变化.     

The electric quadrupole contribution to the circular birefringenceof nonmagnetic anisotropic chiral media: a circular waveguide experiment

Constitutive relations which include electric quadrupole terms, in addition to electric and magnetic dipole terms, are used to describe the “optical activity”, in particular the circular birefringence, of an anisotropic chiral medium which is nonmagnetic. The resulting permittivity and chirality tensors are then used to predict the rotation of the polarization plane of a linearly polarized wave propagating in a circular waveguide filled with the medium. The numerical predictions were tested by measurements between 2.4 and 4 GHz on a 2 m long artificial crystal in a circular waveguide and it was found that the rotation of the polarization was within 13% of the predicted value-good agreement after considering the possible sources of error. It is thus established that the effect of electric quadrupoles must be included when modeling the optical activity of anisotropic chiral media in the long wavelength regime. The anisotropic chiral media which are dealt with here can be classified according to the crystallographic point groups to which they belong, and they may therefore also be considered to be artificial crystals     

Analysis of Planar Dielectric Waveguide with Chiral Cladding

The propagation characteristics of a planar waveguide with chiral media filled in the cladding are presented. The effect of chirality on cutoff, dispersion and field distribution of the waveguide are studied. The results show that the cladding chirality may lead to a single-mode operation in the planar waveguide.     

Analysis of a Metal-Coated Planar Dielectric Waveguide with Chiral Cladding

The propagation characteristics of a metal-coated planar waveguide with chiral media filled in the cladding are presented. The effects of chirality on cutoff, dispersion characteristics and field distributions of the waveguide are studied. The results show that cladding chirality brings phase chopping to the transverse electric field component of those modes with odd mode numbers.     

填充多层介质的共焦椭圆同轴线传播特性

采用在椭圆柱坐标系中分离变量的方法,得到了填充多层介质共焦椭圆同轴线模式特征方程.研究表明:当椭圆退化为圆时,利用角向和径向马修函数的渐进关系,可得到填充多层介质的圆形同轴线的模式特征方程,由此可见,圆形同轴线可看作椭圆形同轴线的特例;当椭圆同轴线内导体半长轴大小为零时,则椭圆同轴线就变成椭圆波导,同样的方法,可得到填充多层介质的椭圆波导模式特征方程.当填充一层介质时,得到了椭圆同轴线和椭圆波导的模式特征方程,结果和相关文献所得结果相同.作为示例,对填充一层介质和两层介质的椭圆同轴线中一些模式色散特性进行了数值计算,分析了椭圆同轴线中介质参数的变化以及椭圆同轴结构的变化等对其传播特性的影响.