Reconfigurable OTA Chamber Design Optimization

The reconfigurable over-the-air chamber has been shown capable of synthesizing the field incident on the device under test in over-the-air testing. However, to date, there has been minimal exploration of the chamber complexity required to achieve a specified accuracy of the synthesized fields. This paper uses an analytic solution for the fields in the chamber based on the modal Green's function along with optimization of the antenna locations for synthesizing the desired fields according to three different cost functions. The results show that different cost functions achieve notably different results, with a traditional optimization based on minimizing error producing solutions that exhibit supergain characteristics.