Reduction of truncation errors in planar near-field aperture antenna measurements using the method of alternating orthogonal projections

A simple and effective procedure for the reduction of truncation error in planar near-field to far-field transformations is presented. The starting point is the consideration that the actual scan plane truncation implies a reliability of the reconstructed plane wave spectrum of the field radiated by...

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Bibliographic Details
Main Authors: Martini, E., Breinbjerg, O., Maci, S.
Format: Conference Proceeding
Language:English
Subjects:
Antenna measurements
Antennas and propagation
Aperture antennas
Electromagnetic measurements
Finite wordlength effects
Image reconstruction
Image resolution
Magnetic field measurement
Reliability engineering
Velocity measurement
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Summary:A simple and effective procedure for the reduction of truncation error in planar near-field to far-field transformations is presented. The starting point is the consideration that the actual scan plane truncation implies a reliability of the reconstructed plane wave spectrum of the field radiated by the antenna only within a certain region inside the visible range. Then, the truncation error is reduced by a Maxwellian continuation of the reliable portion of the spectrum: after back propagating the measured field to the antenna plane, a condition of spatial concentration of the primary field is exploited to define a convergent iterative process which is also stable against moderately noisy data. Far-field patterns reconstructed from both simulated and measured near-field data demonstrate the effectiveness of the proposed procedure.
ISSN:2164-3342
DOI:10.1109/EUCAP.2006.4584841