Verification testing of a spherical near-field algorithm and comparison to compact range measurements

2005 ◽  
Author(s):  
D. Hess ◽  
J. Tavormina
Keyword(s):  
Near Field ◽  
Range Measurements ◽  
Compact Range

scholarly journals A comparison of software- and hardware-gating techniques applied to near-field antenna measurements

2007 ◽  
Vol 5 ◽  
pp. 43-48 ◽  
Author(s):  
M. M. Leibfritz ◽  
M. D. Blech ◽  
F. M. Landstorfer ◽  
T. F. Eibert
Keyword(s):  
Near Field ◽  
Digital Signal ◽  
Test Facility ◽  
Measurement Instruments ◽  
Practical Applications ◽  
Compact Range ◽  
Measurement Results ◽  
Antenna Measurements ◽  
Signal Synthesis ◽  
The Time Domain

Abstract. It is well-known that antenna measurements are error prone with respect to reflections within an antenna measurements test facility. The influence on near-field (NF) measurements with subsequent NF to far-field (FF) transformation can be significantly reduced applying soft- or hard-gating techniques. Hard-gating systems are often used in compact range facilities employing fast PIN-diode switches (Hartmann, 2000) whereas soft-gating systems utilize a network analyzer to gather frequency samples and eliminate objectionable distortions in the time-domain by means of Fourier-transformation techniques. Near-field (NF) antenna measurements are known to be sensitive to various errors concerning the measurement setup as there have to be mentioned the accuracy of the positioner, the measurement instruments or the quality of the anechoic chamber itself. Two different approaches employing soft- and hard-gating techniques are discussed with respect to practical applications. Signal generation for the antenna under test (AUT) is implemented using a newly developed hard-gating system based on digital signal synthesis allowing gate-widths of 250 ps to 10 ns. Measurement results obtained from a Yagi-Uda antenna under test (AUT) and a dual polarized open-ended waveguide used as probe antenna are presented for the GSM 1800 frequency range.

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