请教CST MWS中平面波如何设置TM激励,困扰很久了
CST中的参数具体是这样的
电极化方向参数:
X: IIf (phi*zdeg2rad))
Y:IIf(e_vector,cos(phi*zdeg2rad),sin((theta-90)*zdeg2rad)*sin(phi*zdeg2rad))
Z: IIf(e_vector, 0, cos((theta-90)*zdeg2rad))
我自己先顶一个
关于TM波,我是这样理解的不知道对不对,就是说把电场的分量只设置在入射面内就行,垂直入射面的方向上不要有电场的分量,你可以试一试这样行不行,个人愚见。
但是平面波是TEM波,也就是说在波的传播方向上不可能有电场和磁场的分量了,且垂直于传播方向的面上电场和磁场矢量是相互垂直的。如果传播方向是沿Z方向的,那么只能在x、y方向设置电场分量
如果设置了Z方向的电场分量,软件就会报错的
木有人吗?我自己顶一个,免得沉了,我用麦克斯韦方程组计算了下,设置X、Y方向的电场计算后可以得到X、y方向的磁场,Z方向为0,符合平面波的定义,也就是说再怎么设置也是TEM波。在别的帖子上好像看到有人说用发射波和入射波叠加可以得到,但没试过
去问问CST客户支持?
平面波有三种模式:TEM、TE、TM;TEM截止频率是0,其他的都有最小截止频率,所谓的基模式。想激发TM模式,可以考虑高次模,然后设置TEM和TE模式的为0W激励,试试~
I suppose you can try waveport excitation, it is easy to get cut off frequency with TM mode, the only difference with plane wave is the amplitude variation, it depends on which properties do u look upon, i mean, if you are studying the phase shift or something else not regarding to the amplitude, can have a try.
And if you simulation for the basic characterizations of the material, pls notice the difference between a small scale of box or plate and the really bulk material, the EM performance can be very different, comparing with the theoretical data.(sorry chinese is not available on this PC)
PS, when you setup to increase the scale of the model, then you may have mesh problems; however, a small scale can not present the bulk material properties.
好久没看了,非常感谢,看来只有用波导端口试试了