my structure in CST is too big.(3m*1.6m*1.6* my dimension background material, frequency range is 0.05 to 0.15 GHz , and mesh operation is 15 per wave length per ) because I must to simulate this structure.
but it gives me this warning
"maximum simulation time reached. solver stopped. please note that steady state energy criterion has not been satisfied'
You should extend the maximum number of pulse.
Solve >> Transient Solver >> Specials >> Steady State (the default of maximum number of pulse is 20) please change this number larger than 20. 50 maybe is sufficient.