The Zero order option is useful when a model requires a mesh that produces more than 100,000 tetrahedra, but the model size is small compared to wavelength. The higher order options solve progressively more unknowns for each tetrahedra. Mixed order uses higher order where more accuracy is required, and lower order where fields are weaker.
Warning
If you select Zero Order Solution Basis, all tetrahedra in the model must have edge lengths less than 1/20th wavelength. Thus, this option is usually selected in combination with a specific lambda refinement setting.
一般情况下用一阶可以求解大部分问题
是不是可以这么理解？阶数越高越精确，仿真需要的时间也越长？
二阶的网格比一阶的少点，二届的网格点是在四面体每条边的中点和顶点处。相对来说二阶计算的速度会快点，但是不能保证其精度，一般情况下使用默认的一阶就可以了
你也可以参考谢处方的HFSS工程原理及应用这本书，上面有介绍
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