Probe positioning errors in planar near field measurements. A plane wave synthesis approach

2002 ◽  
Author(s):  
J. Romeu ◽  
P. Escobar ◽  
S. Blanch
Keyword(s):  
Plane Wave ◽  
Near Field ◽  
Field Measurements ◽  
Positioning Errors ◽  
Wave Synthesis ◽  
Synthesis Approach

scholarly journals A fully probe corrected near-field far-field transformation technique employing plane-wave synthesis

2013 ◽  
Vol 11 ◽  
pp. 47-54
Author(s):  
R. A. M. Mauermayer ◽  
T. F. Eibert
Keyword(s):  
Plane Wave ◽  
Antenna Array ◽  
Field Measurement ◽  
Near Field ◽  
Measurement Data ◽  
Synthesis Process ◽  
Far Field ◽  
Field Transformation ◽  
Wave Synthesis ◽  
Near Field Measurement

Abstract. The far-field behavior of an antenna under test (AUT) can be obtained by exciting the AUT with a plane wave. In a measurement, it is sufficient if the plane wave is artificially generated in the vicinity of the AUT. This can be achieved by using a virtual antenna array formed by a probe antenna which is sequentially sampling the radiating near-field of the AUT at different positions. For this purpose, an optimal filter for the virtual antenna array is computed in a preprocessing step. Applying this filter to the near-field measurements, the far-field of the AUT is obtained according to the propagation direction and polarization of the synthesized plane wave. This means that the near-field far-field transformation (NFFFT) is achieved simply by filtering the near-field measurement data. Taking the radiation characteristic of the probe antenna into account during the synthesis process, its influence on the NFFFT is compensated. The principle of the plane-wave synthesis and its application to the NFFFT is presented in detail in this paper. Furthermore, the method is verified by performing transformations of simulated near-field measurement data and of near-field data measured in an anechoic chamber.

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