waveguide port is too short, the waveguide must be homogenous for at least three mesh planes along propagation direction.
我能看懂上面的意思，但是我设置的波导口前的微带线很长了啊，为什么还提示我这个有问题？究竟问题出在什么地方？
谢谢。
Try to enlarge the size of the waveguide port.
By simulating many times, I found the reason that the materials defined in the simulation are not homogenous along the waveguide port propagation direction, for instance, two materials are overlapping by mistake.
能不能用汉语简单的说说整个仿真的步骤
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