求助：ADS Layout仿真时一直出现错误

Simulation / Synthesis Messages
Momentum MomEngine 8.40.075 (*) 350.500 Feb 19 2009
Simulation Mode: uW
Substrate valid
Processing layout...
Using the minimal snap distance of 0.0004 mm
(4 layout resolution points) for layout healing.
Generating mesh at 2GHz...
Mesh generation finished
S-parameter simulation
Automatic selection: direct dense matrix solver
Using multi-threading (2 threads)
Status / Summary
------------------- Momentum ---------------------
Version: Momentum MomEngine 8.40.075 (*) 350.500 Feb 19 2009
Simulation mode: MW
Design: patch
Simulation started on : Fri Mar 02 11:51:10 2012
Layout processing started
Layout processing finished
S-parameter simulation started
...initializing
...analyzing ports
...extracting layout
...reducing mesh
Adaptive frequency sweep started
Simulation frequency [1] = 2 GHz
...loading Green functions
...allocating interaction matrix
...loading interaction matrix
.........|.........|.........|.........|
...solving interaction matrix
WARNING: Could not create the dataset
since no citi files could be found.
...saving project files
---------------- Momentum stopped ----------------

怎么各位大哥都对我的问题那么没兴趣啊?

他不是提示你的基片设置问题么，仔细回去检查基片的设置

先设置基板参数，然后再对基板进行预计算，也就是Precompute那个命令，因为在仿真的过程中，S参数的仿真需要调用先前计算出来的关于substrate和mesh的格林函数，你没有计算当然会出现最后的那个对话框！