FULL SCALE AUTOMOTIVE ANTENNA NEAR FIELD AND FAR FIELD RANGE

摘要

This paper describes an antenna measurement system which combines three types of measurements into one integrated range operating from 45 MHz through 18 GHz. A vehicle can be measured at short ranges inside a protective enclosure at various elevation angles for both low frequency Far Field (FF) measurements and higher frequency Near Field (NF) measurements. The vehicle can also be measured on an extended FF 120m range by radiating through the transparent enclosure.rnThe vehicle enters a 12m radius radome and is mounted on a 6m diameter turntable which enables continuous rotation of the vehicle at a maximum speed of 3 rpm. An elevation positioner moves a 10m arm equipped with linear and roll axes at the top, which provide the NF probe movement. Azimuth rotation of the vehicle and elevation movement of the arm provide a complete hemispherical scan. During FF measurements from outside of the radome, the arm is stored below ground level and is covered.