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Near-field Antenna Measurement Systems
 
Characteristics

System solutions from 0.8 to 650 GHz
Planar, cylindrical and spherical scanners
Broad product palette, from a standard scanner 0.9 m x 0.9 m, up to complex
scanners with 33 m x 16 m dimensions
Exact positioning by precise machinery
Positioning precision 50 µm through the use of step motors
Modular construction with standard elements
Simple enhancement of existing systems (planar cylindrical, cylindrical spherical)
Remote controled positioning for probes and AUTs to ease measuring  
Advantages
Compact construction
Lower infrastructure costs
Independence from weather
Modular construction and subsequent enhancement capability
Higher measurement throughput
Lower maintenance costs through wear resistant motors and positioners
 
Application areas
Characterising of antennas (gain, side lobes, focusing, polarisation)
Characterising of the still zones in absorber halls
Comparison and diagnosis of phased array antennas
 
 
Examples
  
 
Planarscanner With a planar scanner, the AUT is mounted fixed. The AUT is measured with a probe that is positioned in the X and Y directions. Plane scanners are suitable mainly for antennas with high gain, i.e. antennas that concentrate strongly in X and Y direction. The scanner is easy to set up and measurement can be carried out quickly.
 
Zylindrische Scanner The picture on the left shows the principle of a cylindrical scanner. Here the AUT is mounted on a positioner that rotates 360° about an axis. While the AUT rotates, the probe moves along the Y axis. Thus the probe positions occupy the surface of a cylinder, relative to the antenna. A cylindrical scanner gives good results for antennas with high gain in one direction. Scanner set up and the measurements take more time than with a plane scanner.
 
 
Spärische Scanner
 
 
 A spherical scanner measures almost the complete energy emission of the AUT. The AUT is mounted on a positioner that rotates about two axes, and is rotated about the phi and theta axes, while the probe remains fixed. The probe positions occupy the surface of a sphere centered on the antenna. A spherical scanner is good for measuring all sorts of antennas and is required for all round emitting antennas. Scanner set up requires some practice, and the measurements take more time than with a plane or cylindrical scanner.
 
  Example: At Kathrein Germany, their second spherical antenna near-field measurement system, from Nearfield Systems Inc. (NSI), went into action. This system can measure antennas in the frequency range from 800 MHz to 4 GHz. Valuable suggestions from the user were incorporated in the construction of the system. The system was installed in an absorber room.

Reference Project at Fraunhofer IIS
 
 
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emv GmbH
  emv - Elektronische Meßgeräte Vertriebs GmbH • Wallbergstraße 7 • 82024 Taufkirchen • Germany
Phone: +49 89 614171-0 • Fax: +49 89 614171-71 • E-Mail: info@emvgmbh.de
emv GmbH is an ETS-Lindgren Company • www.ets-lindgren.com