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A helix antenna formed by a thin wire and backed by an open PEC cylinder is simulated by using GEMS software pacjkage. The output parameters include far field pattern and axial ratio, which are in good agreement with the expected..
Helix antenna Far Field Pattern @phi=0 deg.
Directivity Pattern @phi=0 deg. Far Field Pattern @phi=90 deg.
Directivity Pattern @phi=90 deg. Axial Ratio Pattern @phi=0 deg.
Axial Ratio Pattern @phi=0 deg. Axial Ratio Pattern @phi=90 deg.
   
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