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Power Density Measurements at 15 GHz for RF EMF Compliance Assessments of 5G User Equipment
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. Zhejiang University, China.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
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2017 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 65, no 12, p. 6584-6595Article in journal (Refereed) Published
Abstract [en]

In this paper, different measurement schemes are studied in order to investigate the possibilities and limitations of scalar-and vector-based measurement systems for radio frequency electromagnetic fields compliance assessments of fifth generation mobile communication user equipment (UE). Two UE antenna array designs, transmitting at 15 GHz and employing patch and notch antenna elements, are considered for different phase excitations. Using free space power density as the exposure metric, the maximum permissible transmitted power of UE, compliant with the maximum permissible exposure limits specified by the U.S. Federal Communications Commission (FCC) and the basic restrictions of the International Commission on Non-Ionizing Radiation Protection, is determined. The accuracy of different measurement schemes is assessed using numerical simulation. Verifying measurements is carried out in a semiane-choic chamber. The results indicate that, for UE employing array antennas and intended to be used in immediate vicinity of the human body, scalar measurement systems used in combination with straightforward field combination techniques will lead to overly conservative results. A more accurate and less conservative approach for these products is to conduct separate measurements for different excitations in order to span the space of possible excitations. This will result in a more complicated measurement setup and increase the measurement time, which points to a need for very fast measurement systems.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2017. Vol. 65, no 12, p. 6584-6595
Keywords [en]
Antenna array, assessment method, fifth generation (5G) mobile communication systems, maximum permissible transmitted power (MPTP), power density, radio frequency (RF) electromagnetic field (EMF) exposure, user equipment (UE)
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-221024DOI: 10.1109/TAP.2017.2712792ISI: 000417885000035Scopus ID: 2-s2.0-85038858525OAI: oai:DiVA.org:kth-221024DiVA, id: diva2:1173363
Funder
Swedish Research Council
Note

QC 20180112

Available from: 2018-01-12 Created: 2018-01-12 Last updated: 2018-01-12Bibliographically approved

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Xu, BoZhao, KunHe, Sailing

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