Reduction of Truncation Errors in Planar Near-Field Aperture Antenna Measurements Using the Gerchberg-Papoulis Algorithm

A simple and effective procedure for the reduction of truncation errors in planar near-field measurements of aperture antennas is presented. The procedure relies on the consideration that, due to the scan plane truncation, the calculated plane wave spectrum of the field radiated by the antenna is re...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2008-11, Vol.56 (11), p.3485-3493
Main Authors: Martini, E., Breinbjerg, O., Maci, S.
Format: Article
Language:English
Subjects:
Antenna measurements
Antennas
Aperture antennas
Apertures
Area measurement
Computational efficiency
Computational modeling
Current distribution
Extrapolation
Finite wordlength effects
Geometry
Iterative algorithms
near-field/far-field transformation
planar scanning
Plane waves
Planes
Probes
Reduction
Stability
truncation error
Truncation errors
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Summary:A simple and effective procedure for the reduction of truncation errors in planar near-field measurements of aperture antennas is presented. The procedure relies on the consideration that, due to the scan plane truncation, the calculated plane wave spectrum of the field radiated by the antenna is reliable only within a certain portion of the visible region. Accordingly, the truncation error is reduced by extrapolating the remaining portion of the visible region by the Gerchberg-Papoulis iterative algorithm, exploiting a condition of spatial concentration of the fields on the antenna aperture plane. The proposed procedure is simple and computationally efficient; it does not require any modification of the measurement procedure and it allows for the usual probe correction. Far-field patterns reconstructed from both simulated and measured truncated near-field data demonstrate its effectiveness and stability against measurement inaccuracies.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2008.2005442