Smith, J; Knight, D (2022) Single Cut Near To Far-Field Antenna Gain Transform. NPL Report. TQE 25

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Abstract

This following report describes a feasibility study undertaken to determine whether antenna radiation pattern measurements performed on a single ‘cut’ or plane in the near field region could be transformed to produce the far field radiation pattern of that plane with sufficient accuracy to be offered as a measurement service. Two approaches for performing this transformation are investigated based on prior literature. The first approach is based on a 2D near field to far field transformation using cylindrical wave expansions and probe correction coefficients. The second approach, also based on the cylindrical wave expansion, is for the specific case of an electrically long antenna array where one dimension of the antenna is significantly smaller than the other. Both approaches were applied to measured near-field radiation profiles of an X-band marine radar array. The results of these transformations were compared to the far field profiles calculated from the full two-dimensional set of measurements using the program SNIFTD. The single cut transformations were found to differ significantly from each other and the calculated far field pattern, thus the method has been determined to be unsuitable as a measurement service.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	TQE 25
Subjects:	Electromagnetics > Electrical Measurement
Divisions:	Electromagnetic & Electrochemical Technologies
Identification number/DOI:	10.47120/npl.TQE25
Last Modified:	16 Nov 2022 10:19
URI:	http://eprintspublications.npl.co.uk/id/eprint/9599

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