CST MWS仿真SIW感性窗濾波器的問題

我Mesh網(wǎng)格感覺已經(jīng)很密了 怎么還有這個錯誤 Waveguide for port number 1 is too short. The waveguide must be homogeneous for at least three mesh planes along propagation direction.

這段英文翻譯成中文是什么？