12-Meter Radius Spherical Near-Field Measurement
System for Telematics Applications

More and more telecommunications systems are being added to automobiles. Examples include cellular phones, GPS navigation, mobile video, and Wi-Fi. These systems operate from a few hundred megahertz up to 6 GHz and higher. And in each application, the vehicle body and the ground plane effect the system's electromagnetic performance.

Nippon Antenna's R&D center in Itzehoe, Germany has installed a large far-field/near-field system to quantify these effects. The system includes a 12-meter dielectric gantry under a dielectric radome and a ground reflection far-field range. The dielectric gantry provides motion in theta while a 6.5 meter turntable provides motion in phi.

  Spherical Near-Field measurement system for telematics
     
Factory testing of the 12 meter gantry positioning system for Nippon Antenna's spherical nearfield scanner.   Interior view, Nippon Antenna Telematics R&D Facility
   
Factory testing of the 12 meter gantry positioning system for Nippon Antenna's spherical nearfield scanner.  
Factory testing of the dielectric gantry and the positioner control system at The Howland Company before shipment to Germany.   The Gantry Positioning System installed in the completed facility.
     

The Howland Company designed and fabricated the dielectric gantry and its positioning system. It features a dual dielectric truss system driven synchronously from each side by open-loop stepper motors. The system has a maximum rotation speed of 1º/sec and a positioning accuracy of ±0.1º.

 

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