NEC-LIST: comparison of the results of the nec2 and feko

hi,friends,

    Recently ,I was modeling a wire-duoconical antenna with the 4nec2, and I
found that the input impedance from NEC2 differs much with that from FEKO.

    NEC2 uses the point match and FEKO uses the Garlekin's Method, so I think
the numerical results of the FEKO should be of more accuracy. What should I do
to reduce the difference between the results from two softwares? The nec file is
listed below:

CE
GW 1 19 0.0000 0.0000 0.1000 2.3000 0.0000 4.9000 0.0030
GW 2 12 2.3000 0.0000 4.9000 0.0000 0.0000 7.3000 0.0030
GR 2 6
GW 13 1 0.0000 0.0000 0.0000 0.0000 0.0000 0.1000 0.0030
GE 1
GN 1
EX 0 13 1 0 1.0000 0.0000
FR 0 81 0 0 7.0000 0.2500
EN

The modeling frequency is between 7-27MHz. When using nec2 (the 4nec2 ), I
set the segment length as 1/40 of the minmum wavelength initially, and then I
reduce the segment length and find no good convergence. What mistakes I have
made in the modeling? or is the nec2 not recommended to model such wire
antennas with several benches connecting to a single node? I hope someone
can help me and give me some useful suggestion, THANKs.

                                                       sincerely Xiaolin Zhang
                                                       28/07/09
  

MxRWYEAH.NETCb7QSJOd#:Dz5DVUImCb7QSJOd

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