.svg?la=en&revision=cee9767f-8e72-4d76-a07a-14ba25688269&hash=ADF64722447408F8CA70B4436F59CB64)
Vertical Cylinder Scanning for Superior Angular Coverage
The CNF method offers the ability to acquire data over a vertical cylinder surrounding the DUT. This type of system offers superior angular coverage than the PNF geometry but does not offer full sphere coverage like the SNF approach. CNF is well-suited to testing fan beam antennas, or to measure the backlobes of antennas. Care must be taken to ensure that minimal radiation is directed toward the open top and bottom of the cylinder.
CNF
A vertical CNF system combines a lower Azimuth rotator with a vertical linear axis. Since a PNF scanner already includes such a linear axis, CNF upgrades to vertical PNF systems are common.
Small Cylindrical Near-Field System
The small cylindrical scanner systems are ideal for measuring broad beam (azimuth) antennas with apertures less than five feet making them ideal for testing stacked linear arrays.
Medium Cylindrical Near-Field System
The medium cylindrical scanner systems are ideal for measuring broad beam (azimuth) antennas with apertures less than twelve feet making them ideal for testing stacked linear arrays.
Large Cylindrical Near-Field System
Large cylindrical near-field measurement systems are ideal for measuring broad beam (azimuth) antennas with apertures less than 15.8 m (52 ft) making them ideal for testing stacked linear arrays, cellular, and PCS antennas as well as higher frequency antennas with larger apertures.