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Accurate Reconstruction of Far-Field Polarization Beam Patterns from Planar Near-Field Measurements
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  • Haoran Kang ,
  • Alvaro Gonzalez ,
  • Ryo Sakai ,
  • Keiko Kaneko
Haoran Kang
Institute of Astronomy

Corresponding Author:[email protected]

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Alvaro Gonzalez
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Ryo Sakai
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Keiko Kaneko
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Abstract

Planar near-field measurements are a common method to characterize antenna performance at millimeter and submillimeter wavelengths. Far-field beam patterns are then calculated from those measurements. However, different approximations have been traditionally used for this calculation without careful analysis. In this paper, we derive a Near-field-to-Far-field Transformation (NFT) based on diffraction theory and the full components of electrical fields based on the boundary condition in the far-field region. We analyze the systematic errors introduced by Fourier Transformation (FT) and the probe antenna by comparison with simulations. We further apply our data analysis procedures in the near-field measurement of a corrugated horn. Measurement and simulation results suggest that when all the procedures are conducted accurately, we are able to reconstruct far-field beam patterns from planar near-field measurements with high accuracy.