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Log-periodic and spiral antennas

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Vasis

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log periodic spiral antenna

Hi!
Now, I'm writting a master's thesis concerns antennas for UWB systems. As a basis, I take frequency independent antennas - eqispiral and log-periodic (planar). But I have some problems in modelling (I simulate it in HFSS and Microwave Office)- I'm not sure in results (VSWR, Zin, polar pattern). May be, anybody shares experience (what kind of results I should draw?).

best regards, Vas
 

does MWO can simulate 3D antennas? I don't think.

Maybe Feko...
 

MWO can simulate 2 1/2- D, I think it enough for correct modeling? Is not it&
 

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