请问怎么设置FDTD模拟中的图形点数？

您好，我正在尝试使用FDTD模拟来模拟微带环谐振器。
为了达到理想的结果（我有电路的实际测量），我建立了一个密集的网格，包括电路的所有细节，以尽可能接近真实的测量。
问题是通过模拟获得的S参数图具有非常少的点。
谐振器频率是正确的（2 GHz和4 GHz），但图表看起来很可怕，只有这么几点。
我试图更改所有FTDT模拟选项但是没有办法设置将出现在图表上的点数，但是，我意识到点数与时间步长参数有关系。
当时间步长减小时，点之间的频率范围增加。
时间步长参数取决于网格中最小单元格的大小，因此我发现增加图形点数的唯一方法是减小单元格大小并减少一点精度。
我正在评估的频率范围是1GHz到5GHz，最小的单元尺寸是0.1x 0.1 x0.017 mm。
是否可以在不改变单元尺寸的情况下降低点之间的频率范围？
谢谢大家！
塞尔吉



     以下为原文

  Hello,

I'm trying to simulate a microstrip ring resonator using an FDTD simulation. In order to achieve the desired result (I have the real measures of the circuit) I've build a dense grid to include all the details of the circuit to approach as much as possible to the real measure. The problem is that the S-parameter graph obtained with the simulation has very few points. The resonator frequencies are correct (2 GHz and 4 GHz) but the graph looks horrible with such few points.  

I tried to change all FTDT simulation options but there is no way to set the number of points that will appear on the graph, however, I realised that the number of points has a relationship with the timestep parameter. When the timestep decreases, the frequency range between points increases. The timestep parameter depends on the size of the smallest cell of the grid, so the only way I've found to increase the number of points of the graph is decreasing the cell size and loosing a little bit of precision.

The frequency range I'm evaluating is from 1GHz to 5GHz and the smallest cell size is 0.1x 0.1 x0.017 mm.

Is it possible to decrease the frequency range between points without changing the cell size?

Thanks all!

Sergi