who have cst studio suite 2006 experience?

hi all,i have problem in my antenna simulation,the system unstable(s11 not exceed -0.00001 db) ,so any person who have cst studio suite experience contact me
pls
thanks

Hi abdoeng
Can you explain your design a little bit more or upload your circuit file?
Regards

hi mr ghz,thanks first,i simulate wide slot antenna,i define all element and band and meshing,port,boundry,when i start simulation,there is no signal propagation,here the file
pls ghz reply me so i can try the simulation

Hi abdoeng
I simulated the design you posted. There occured no problem, I attached you the simulated timedomain and S11.
I guess that the problem you have is one of the following:
- You have a license-file with enabled multiprocessor-support, but your machine only has 1 CPU. In this case CST sometimes causes problems (dielectrics are shortened). The solution is to go to 'Transient Solver / Specials / Solver' and to uncheck 'Use parallelization up to xxx CPU's'
- Try to lower the frequency-range for simulation. Instead simulating 2-20GHz in one pass, you could split it in 2 or more passes and combine the results. (Anyway: I simulated it in one pass)
Regards