By means of fluid model and linear field theory, the dispersion equation of the electromagnetic wave propagation along a cylindrical waveguide filled with an infinitely thin annular plasma.
利用等离子体流体模型和线性场理论，分别导出了无限薄环形等离子体填充圆柱波导和无限薄环形等离子体填充波纹波导中的色散关系。
Second, solve electromagnetic wave propagation of two-dimension concave objects by symplectic Geometrical Theory, and get better field solutions in caustic field2)comparing with classical GO method.
二利用辛几何理论求解电磁波在二维凹面体散射中的传播问题，与经典的GO解比较，特别在焦散区得到较理想的场解。
Second, solve electromagnetic wave propagation of two-dimension concave objects by symplectic Geometrical Theory, and get better field solutions in caustic field2)comparing with classical GO method.
二利用辛几何理论求解电磁波在二维凹面体散射中的传播问题，与经典的GO解比较，特别在焦散区得到较理想的场解。
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