CST 仿真结果警告：Parallel symmetry plane！

仿真时出现警告：Parallel symmetry plane！This may lead to inaccurate farfield results. It is recommended to manually set an appropriate decoupling plane in the farfield plot dialog. 检查过了，根本没有设置过对称面。按照它说的设decoupling plane 以后远场结果仍然不准确。哪位遇到过这种情况，到底怎么回事呢？praying!

是的，设的是open 边界