need answers-very urgent

kbmanick said:

dear all.

when i simulate the cpw antenn with fr4 substrate the gain is not uniform over the band of frequencies.
what might be the reason? how to correct it?

--Check the radiation efficiency. You have little control to it.

also i need what is gain bandwidth? impedance bandwidth? pattern bandwidth?

--Check some textbooks. You can find answers over there.

also what is the permittivity of fr4 with loss tangent value?

--FR4, Er 4.4 (4.2-4.6), loss tangent 0.018 (0.016--0.02). How did you do your simulation if you don't know these values?

for what applications we need circular polarization?

--If your receiver/transmitter is orientation sensitive

what are the applications in 6 to 7 GHz frequencies?


with thanks in advance,

KBMani.

Click to expand...