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S11 is the reflection coefficient of an incident wave at port 1 in any given network. You could theoretically have a reflection of 0, giving S11 of -infinity. In practice the value you shoot for depends on the application (which is what here?) and the system at hand. Some applications an S11 at a certain frequency of -10dB might be good enough, others you might need -50dB.
1. What exactly are you simulating?
2. Where are you getting this S11 (one peak or a band)?
3. Are you trying to have a well-matched network (which you do here)?
4. What's the application?
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