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Träfflista för sökning "LAR1:lu ;pers:(Gustafsson Mats);lar1:(kth);pers:(Sjoberg Daniel)"

Search: LAR1:lu > Gustafsson Mats > Royal Institute of Technology > Sjoberg Daniel

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1.
  • Ludvig-Osipov, Andrei, et al. (author)
  • Fundamental Bounds on Transmission Through Periodically Perforated Metal Screens With Experimental Validation
  • 2020
  • In: IEEE Transactions on Antennas and Propagation. - : IEEE. - 0018-926X .- 1558-2221. ; 68:2, s. 773-782
  • Journal article (peer-reviewed)abstract
    • This article presents a study of transmission through arrays of periodic sub-wavelength apertures. Fundamental limitations for this phenomenon are formulated as a sum rule, relating the transmission coefficient over a bandwidth to the static polarizability. The sum rule is rigorously derived for arbitrary periodic apertures in thin screens. By this sum rule we establish a physical bound on the transmission bandwidth which is verified numerically for a number of aperture array designs. We utilize the sum rule to design and optimize sub-wavelength frequency selective surfaces with a bandwidth close to the physically attainable. Finally, we verify the sum rule and simulations by measurements of an array of horseshoe-shaped slots milled in aluminum foil.
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2.
  • Lundgren, Johan, et al. (author)
  • A Near-Field Measurement and Calibration Technique : Radio-Frequency Electromagnetic Field Exposure Assessment of Millimeter-Wave 5G Devices
  • 2021
  • In: IEEE Antennas & Propagation Magazine. - : Institute of Electrical and Electronics Engineers (IEEE). - 1045-9243 .- 1558-4143. ; 63:3, s. 77-88
  • Journal article (peer-reviewed)abstract
    • Accurate and efficient measurement techniques are needed for an exposure assessment of 5G portable devices, which are expected to utilize frequencies beyond 6 GHz with respect to radio-frequency (RF) electromagnetic field (EMF) exposure limits. At above 6 GHz, these limits are expressed in terms of the incident power density, thus requiring the EMFs to be evaluated with high precision in close vicinity to the device under test (DUT), i.e., in the near-field region of the radiating antenna. This article presents a cutting-edge near-field measurement technique suited for these needs. The technique, based on source reconstruction on a predefined surface representing the radiating aperture of the antenna, requires two sets of measurements: one of the DUT and one of a small aperture. This second measurement functions as a calibration of both the measurement probe impact on the received signal and the experimental setup in terms of the relative distance between the probe and the DUT. Results are presented for a 28- and a 60-GHz antenna array, both of which were developed for 5G applications. The computed power density is compared with simulations at evaluation planes residing as close as one fifth of a wavelength (lambda/5) away from the DUT.
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
Gustafsson, Mats (2)Undo refine
Lundgren, Johan (2)
Sjoberg, Daniel (2)Undo refine
Jonsson, B. Lars G. (1)
Ivanenko, Yevhen (1)
Xu, Bo (1)
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Ehrenborg, Casimir (1)
Colombi, Davide (1)
Ericsson, Andreas (1)
Helander, Jakob (1)
Ludvig-Osipov, Andre ... (1)
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University
Royal Institute of Technology  (2)Undo refine
Lund University (2)
Linnaeus University (1)
Language
English (2)
Research subject (UKÄ/SCB)
Engineering and Technology (2)
Natural sciences (1)

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