paujuan
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The radiation pattern (i.e. gain/directivity) calculated by HFSS does not change with S11. S11 stands for the impedance matching performance, which is another paramter different from far-field gain/directivity.
The Gain/directivity change with S11.
I am not an HFSS user, but for the EM simulators that I have, gain can be calculated both ways: with or without the "loss" from S11.
For directivity, that refers to the total radiated power anyway, so it is independent of S11.
You are trying to say that without having a Good impedance Match at the antenna input,you will be able to have a High Directivity??????
Yes. Just get an antenna textbook and look at the definition of directivity.
impedance matching does of course impact the radiation of the antenna, this is known as radiation efficiency. directivity and gain are related by this efficiency. so i think what volker is trying to say is, and correctly say, is that directivity should be not impacted by your poor match, however gain will. in other words, the shape of your radiation pattern should stay generally the same between directivity and gain, while the amplitude will change.
directivity = gain X efficiency (essentially)
directivity = gain X efficiency (essentially)
so i think what volker is trying to say is, and correctly say, is that directivity should be not impacted by your poor match, however gain will.
Exactly that was what i have written that Gain/directivity ll get effected due to S11 or poor match.
---------- Post added at 20:08 ---------- Previous post was at 20:05 ----------
Isnt it like:
Gain=efficiencyxdirectivity.
???
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