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5G Internet of Things (IOT) Near and Far-Fields and Regulatory Compliance Intricacies

Internet of things (IOT) primarily consists of an instrumentation system that connects to the internet. Most modern applications of IOT would be integrated with wireless connectivity. Billions of sensing devices will be integrated with million types of wireless devices operating at varying frequency bands, power levels, and time intervals. Both intentional and unintentional radiations from the circuits of device instrumentation system, the collocated devices, and the operating environments can be higher than the operating sensitivity level of the wireless receivers. This paper reviews testability challenges of 5G IOT devices integrated with mmW and low frequency wireless. It also provides some insight on mmW near-field and far-field measurement challenges, and the necessity of radiated immunity evaluation. Lastly, it describes the theory used to explain the observation that the actual near-field or far-field starting distance is smaller than the calculated distance based on the overall dimensions of the massive MIMO antenna system and discusses the supporting experimental data.