TechRxiv-Accurate Reconstruction of Far-Field Polarization Beam Patterns from Planar Near-Field Measurements.pdf (1.93 MB)
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Accurate Reconstruction of Far-Field Polarization Beam Patterns from Planar Near-Field Measurements

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posted on 2022-03-17, 03:49 authored by Haoran KangHaoran Kang, Alvaro Gonzalez, Ryo Sakai, Keiko Kaneko
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.


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Submitting Author's Institution

Institute of Astronomy, The University of Tokyo

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  • Japan