Transient over-the-air mm-wave measurements

A setup and process has been created to investigate over-the-air mm-wave measurements that are quasi-linear and are at least partially transient in nature including reactions to thermal evolution of the DUT or related to beam position dynamics. Working from a broadband/mm-wave network analyzer platform with a deep memory digitizer and more novel synchronization tools, it was possible to evaluate transient, angle-dependent transmitter compression, cold-start receiver system patterns and transient responses during pattern steps. Measurement uncertainties, for these particular measurements, were largely limited by repeatability on the order of 0.02 dB/0.2 degrees at modest power levels.