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difference between measurements and simulation of my antenna

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jamesy

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hey ,

im simulating a Helix antenna but i have some Problems the Simulation with cst dont fit the measurements i made . i uploaded some results and some pics . will be happy about any help
thx
 

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  • meas02 antenne an port 1.JPG
    meas02 antenne an port 1.JPG
    1.8 MB · Views: 89
  • Vergleich - Langes und kurzes Kabel.png
    Vergleich - Langes und kurzes Kabel.png
    22 KB · Views: 121
  • Antenna_on_plane1.png
    Antenna_on_plane1.png
    23.6 KB · Views: 85
  • S11_from_cst_studio1.png
    S11_from_cst_studio1.png
    22.3 KB · Views: 85

The ripple at low frequency looks like your time domain simulation was aborted too early (not enough timesteps).
 

and how can i do to solve the problem ? how can i make more timesteps ?
 

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