EMI test sites for radiated emission measurements in the 1 GHz to 18 GHz require site validation by measurement of site voltage standing wave ratio (SVSWR), which is the ratio of the maximum received signal to the minimum received signal caused by interference between direct (intended) and reflected signals. There are two different approaches for showing compliance with the acceptance criterion:
• The SVSWR method in line with CISPR 16-1-4. This requires special antennae described in the standard
• The new time domain SVSWR (TD SVSWR) method in line with the ANSI C63.25
BNN is equipped to undertake site VSWR measurements by both the methods using traceable equipment and Antennae. The test frequency points and test locations are selected on the basis of test standard and the test site configuration.