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5th Generation Mobile Network Systems(5G systems) operating in milli-meterWave (mmW) bands will employ base stations with integrated Active AntennaSystems (AASs) capable of beam-tracking using narrow beams obtained from arrayantennas encapsulated in a chip-like device. Regulatory limits for unwantedRadio Frequency (RF) emissions are currently set in terms of Total RadiatedPower (TRP). As measurements at the antenna connectors are not possible,Over-The-Air (OTA) methods for TRP of unwanted emissions are needed. The methodinvestigated here uses power density measurements on a spherical surface in ananechoic chamber. Two major challenges with such a method are: need for largenumber of angular points, and search for worst case antenna configuration perfrequency for electrically large devices at high frequencies. These challengesare addressed by investigating the impact of correlation, sparse sampling, anduse of beam sweeping on the TRP estimate. Finally, it is investigated how andin which spatial regions near-field tangential electric field measurements canbe used to assess TRP.

Angular sampling, Test Signal, and Near Field Aspects for Over-the-Air Total Radiated Power Assessment in Anechoic Chambers