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采用坐标变换将任意过渡对称千兆赫横电磁传输室（ＧＴＥＭＣｅｌｌ）的三维本征值问题变换为二维本征值问题。再采用数值方法求解二阶非线性偏微分方程的本征值，得到对称ＧＴＥＭｃｅｌｌ单模工作频率的上限。理论计算值与实验值吻合较好。
Coordinate transformation is used to transform the three-dimensional eigenvalue problem of any trans-symmetric gigahertz transversely transmissive electromagnetic transmission room (GTEMCell) into a two-dimensional eigenvalue problem. Then, the eigenvalues of the second-order nonlinear partial differential equations are solved numerically to obtain the upper limit of the symmetrical GTEMcell single-mode operating frequency. The calculated value is in good agreement with the experimental data.