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Power Density Measurements at 15 GHz for RF EMF Compliance Assessments of 5G User Equipment
The Royal Institute of Technology (KTH), Department of Electromagnetic Engineering, Stockholm, Sweden; Zhejiang Provincial Key Laboratory for Sensing Technologies, Centre for Optical and Electromagnetic Research, College of Optical Science and Engineering, Zhejiang University, Hangzhou, China.
The Royal Institute of Technology (KTH), Department of Electromagnetic Engineering, Stockholm, Sweden.
Ericsson Sweden, Stockholm.
Ericsson Sweden, Stockholm.
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2017 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 65, no 12, 6584-6595 p., 7942093Article 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 semianechoic 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, 6584-6595 p., 7942093
Identifiers
URN: urn:nbn:se:ltu:diva-67139DOI: 10.1109/TAP.2017.2712792ISI: 000417885000035Scopus ID: 2-s2.0-85038858525OAI: oai:DiVA.org:ltu-67139DiVA: diva2:1170165
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Validerad;2018;Nivå 2;2018-01-02 (svasva)

Available from: 2018-01-02 Created: 2018-01-02 Last updated: 2018-01-16

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