The eigenequation of coaxial waveguide with inner and outer slotted structure is derived using the fields matching method, and the outer slotted cylindrical waveguide eigenequation is derived as well. Numerical simulation is conducted on the propagation characteristics of 2π mode in the inner and outer slotted structure and the outer slotted structure. The relationship between slot depths and eigenvalues of both structures is discussed, as well as the relationship between frequency and radiuses in the former structure. The results reveal that, the eigenvalue of inner and outer slotted waveguide increases with deeper inner slot, and decreases with deeper outer slot. The waveguide frequency is almost independent of inner radiuses, but is significantly affected by outer radiuses.%推导了内外开槽同轴波导和外开槽圆波导的特征方程.数值模拟了内外开槽同轴波导及外开槽圆波导中2π模式的传播特性,研究了开槽深度与截止波数的关系及内外开槽潘尼管频率与各个半径之间的关系.结果表明:内外开槽同轴波导的特征值随内开槽深度的增加而增大,随外开槽深度的增加而减小；内槽半径对频率的影响很小,外槽半径起主要作用.
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