Question in Ansoft HFSS?

Who knows? It's certainly possible for SOMETHING to have a tip to -85dB. More info?

plz give more info about S11 parameter..

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?

I AM SIMULATION AND ANALYSIS OF CIRCULAR MICROSTRIP ANTENNAS BY USING THE CONCEPT OF ARTIFICIAL DIELECTRIC. SEE THE S11 GRAPH ATTACH WITH THIS MAIL.

its urgent..............