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Andreasson, Björn PererikORCID iD iconorcid.org/0000-0002-3764-4235
Publications (10 of 17) Show all publications
Iqbal, A., Al-Hasan, M., Mabrouk, I. B., Andreasson, P., Nilsson, E., Smida, A. & Denidni, T. A. (2024). SIW-based frequency-adjustable antenna for IoT-based duplex wireless devices. AEU - International Journal of Electronics and Communications, 173, Article ID 155019.
Open this publication in new window or tab >>SIW-based frequency-adjustable antenna for IoT-based duplex wireless devices
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2024 (English)In: AEU - International Journal of Electronics and Communications, ISSN 1434-8411, E-ISSN 1618-0399, Vol. 173, article id 155019Article in journal (Refereed) Published
Abstract [en]

This paper proposes a compact and frequency-adjustable/reconfigurable dielectric (DR)-loaded eighth-mode substrate integrated waveguide (EMSIW) antenna for duplex wireless communications. The miniaturization of the resonators is realized using a rectangular slot and high isolation is achieved by keeping a reasonable space between them. The proposed design is simulated using a three-dimensional (3D) full-wave simulator, then analysed with a circuit model and finally validated experimentally. Frequency-reconfigurability in the suggested antenna is achieved by placing DRs with different permittivities in the designated holes that are realized in the open-ended portion of each resonator. Consequently, the lower- and high-resonant bands can be reconfigured from 4.70 to 5.23 GHz and from 5.55 to 6.34 GHz, respectively. It is worth mentioning that both resonant band can be independently reconfigured. Moreover, the inter-resonator coupling is always lower than −23.5 dB in the bands of interest. Furthermore, the peak realized gains are always greater than 4.7 dBi in the lower frequency band and 5.5 dBi in the higher one. The suggested antenna has stable radiation properties in both bands in all frequency ranges. Hence, this design is suitable for compact reconfigurable devices due to its compactness, large frequency ranges, stable radiation patterns, and high isolation. © 2023 Elsevier GmbH

Place, publisher, year, edition, pages
München: Elsevier, 2024
Keywords
Dielectric rod, Duplex antenna, EMSIW antenna, WLAN band
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:hh:diva-52172 (URN)10.1016/j.aeue.2023.155019 (DOI)001118353100001 ()2-s2.0-85177200335 (Scopus ID)
Note

Funding: The Deanship of Scientific Research at Majmaah University for supporting this work under Project number R-2023-791.

Available from: 2023-12-01 Created: 2023-12-01 Last updated: 2024-01-17Bibliographically approved
Guarese, R., Andreasson, P., Nilsson, E. & Maciel, A. (2021). Augmented situated visualization methods towards electromagnetic compatibility testing. Computers & graphics, 94, 1-10
Open this publication in new window or tab >>Augmented situated visualization methods towards electromagnetic compatibility testing
2021 (English)In: Computers & graphics, ISSN 0097-8493, E-ISSN 1873-7684, Vol. 94, p. 1-10Article in journal (Refereed) Published
Abstract [en]

In electrical engineering, hardware experts often need to analyze electromagnetic radiation data to detect any external interference or anomaly. The field that studies this sort of assessment is called electromagnetic compatibility (EMC). As a way to support EMC analysis, we propose the use of Augmented Situated Visualization (ASV) to supply professionals with visual and interactive information that helps them to comprehend that data, however situating it where it is most relevant in its spatial context. Users are able to interact with the visualization by changing the attributes being displayed, comparing the overlaps of multiple fields, and extracting data, as a way to refine their search. The solutions being proposed in this work were tested against each other in comparable 2D and 3D interactive visualizations of the same data in a series of data-extraction assessments with users, as a means to validate the approaches. Results exposed a correctness-time trade-off between the interaction methods. The hand-based techniques (Hand Slider and Touch Lens) were the least error-prone, being near to half as error-inducing as the gaze-based method. Touch Lens also performed as the least time-consuming method, taking in average less than half of the average time required by the others. For the visualization methods tested, the 2D ray casts presented a higher usability score and lesser workload index than the 3D topology view, however exposing over two times the error ratio. Ultimately, this work exposes how AR can help users to have better performances in a decision-making context, particularly in EMC related tasks, while also furthering the research in the ASV field. © 2020 Elsevier Ltd

Place, publisher, year, edition, pages
Oxford: Elsevier, 2021
Keywords
Augmented reality, Visualization, 3D interaction, Situated analytics, Electromagnetic compatibility
National Category
Embedded Systems
Identifiers
urn:nbn:se:hh:diva-43698 (URN)10.1016/j.cag.2020.10.001 (DOI)2-s2.0-85093689729 (Scopus ID)
Note

Funding: This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001, partly by Fapergs-Brazil PqG2017 Project CHIHC, and also partly by the Swedish Council for Higher Education (UHR).

We also acknowledge the support from CNPq-Brazil 311353/2017-7, and a Linnaeus-Palme grant within the partnership (3.3.1.34.11116-2019) between the School of Information Technology at Halmstad University and the Institute of Informatics at UFRGS for their financial support.

Available from: 2020-12-14 Created: 2020-12-14 Last updated: 2021-04-13Bibliographically approved
Guarese, R., Nilsson, E., Andreasson, B. P. & MacIel, A. (2020). A proposal for augmented situated visualization towards EMC testing. In: Moser T.; Bruckner F. (Ed.), CEUR Workshop Proceedings: . Paper presented at 2020 XChange Reality!, XCR 2020, 27-30/04, St. Polten, aut, 2020 (pp. 12-15). CEUR-WS, 2618
Open this publication in new window or tab >>A proposal for augmented situated visualization towards EMC testing
2020 (English)In: CEUR Workshop Proceedings / [ed] Moser T.; Bruckner F., CEUR-WS , 2020, Vol. 2618, p. 12-15Conference paper, Published paper (Refereed)
Abstract [en]

Copyright © 2020 for this paper by its authors.In EMC testing, 3D electromagnetic field data often needs to be visually analysed by an expert in order to detect product defects or unwanted interference between multiple devices. In this sense, the present work proposes the use of data visualization techniques allied to an Augmented Reality user interface to provide information that helps professionals to analyse the same data, however spatially situated where it was first measured. Apart from visualizing it, users may also interact with the data to narrow down their search by switching the attributes being displayed, combining them together, applying filters or changing the formatting in which data is presented. The approaches being proposed in this work will ultimately be tested against each other in comparable 2D and 3D interactive visualizations of the same data in a series of usability assessments with users to validate the solutions. The goal is to ultimately expose whether AR can help users to make more accurate decisions, particularly in EMC related tasks.

Place, publisher, year, edition, pages
CEUR-WS, 2020
Series
CEUR Workshop Proceedings, ISSN 1613-0073 ; 2618
Keywords
Human-centered computing - Visualization - Visualization design and evaluation methods, Human-centered computing - Visualization - Visualization techniques - Treemaps
National Category
Human Computer Interaction
Identifiers
urn:nbn:se:hh:diva-44698 (URN)2-s2.0-85087841200 (Scopus ID)
Conference
2020 XChange Reality!, XCR 2020, 27-30/04, St. Polten, aut, 2020
Available from: 2021-06-14 Created: 2021-06-14 Last updated: 2021-06-14Bibliographically approved
Friel, R., Gerling-Gedin, M., Nilsson, E. & Andreasson, B. P. (2019). 3D Printed Radar Lenses with Anti-Reflective Structures. Designs, 3(2), Article ID 28.
Open this publication in new window or tab >>3D Printed Radar Lenses with Anti-Reflective Structures
2019 (English)In: Designs, E-ISSN 2411-9660, Vol. 3, no 2, article id 28Article in journal (Refereed) Published
Abstract [en]

Background: The purpose of this study was to determine if 3D printed lenses with wavelength specific anti-reflective (AR) surface structures would improve beam intensity and thus radar efficiency for a Printed Circuit Board (PCB)-based 60 GHz radar. This would have potential for improved low-cost radar lenses for the consumer product market. Methods: A hyperbolic lens was designed in 3D Computer Aided Design (CAD) software and was then modified with a wavelength specified AR structure. Electromagnetic computer simulation was performed on both the ‘smooth’ and ‘AR structure’ lenses and compared to actual 60 GHz radar measurements of 3D printed polylactic acid (PLA) lenses. Results: The simulation results showed an increase of 10% in signal intensity of the AR structure lens over the smooth lens. Actual measurement showed an 8% increase in signal of the AR structure lens over the smooth lens. Conclusions: Low cost and readily available Fused Filament Fabrication (FFF) 3D printing has been shown to be capable of printing an AR structure coated hyperbolic lens for millimeter wavelength radar applications. These 3D Printed AR structure lenses are effective in improving radar measurements over non-AR structure lenses. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.

Place, publisher, year, edition, pages
Basel: MDPI, 2019
Keywords
radar, 3D printing, lenses, anti-reflective coatings, millimeter wave radar, simulation, additive manufacturing, quasi-optics
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:hh:diva-39695 (URN)10.3390/designs3020028 (DOI)2-s2.0-85087497229 (Scopus ID)
Funder
Knowledge Foundation, 2016/0303
Available from: 2019-06-11 Created: 2019-06-11 Last updated: 2021-06-03Bibliographically approved
Zalden, P., Quirin, F., Schumacher, M., Siegel, J., Wei, S., Koc, A., . . . Sokolowski-Tinten, K. (2019). Femtosecond x-ray diffraction reveals a liquid–liquid phase transition in phase-change materials. Science, 364(6445), 1062-1067
Open this publication in new window or tab >>Femtosecond x-ray diffraction reveals a liquid–liquid phase transition in phase-change materials
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2019 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 364, no 6445, p. 1062-1067Article in journal (Refereed) Published
Abstract [en]

In phase-change memory devices, a material is cycled between glassy and crystalline states. The highly temperature-dependent kinetics of its crystallization process enables application in memory technology, but the transition has not been resolved on an atomic scale. Using femtosecond x-ray diffraction and ab initio computer simulations, we determined the time-dependent pair-correlation function of phase-change materials throughout the melt-quenching and crystallization process. We found a liquid–liquid phase transition in the phase-change materials Ag4In3Sb67Te26 and Ge15Sb85 at 660 and 610 kelvin, respectively. The transition is predominantly caused by the onset of Peierls distortions, the amplitude of which correlates with an increase of the apparent activation energy of diffusivity. This reveals a relationship between atomic structure and kinetics, enabling a systematic optimization of the memory-switching kinetics. © 2019 American Association for the Advancement of Science.

Place, publisher, year, edition, pages
Washington, DC: American Association for the Advancement of Science, 2019
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:hh:diva-39862 (URN)10.1126/science.aaw1773 (DOI)000471306700040 ()31197008 (PubMedID)2-s2.0-85067625790 (Scopus ID)
Available from: 2019-06-19 Created: 2019-06-19 Last updated: 2019-12-10Bibliographically approved
Hagström, A. L., Vass, L., Liu, F., Gerling, M., Karlsson, P.-O., Nilsson, E. & Andreasson, B. P. (2018). An iterative approach to determine the refractive index of 3D printed 60GHz PLA lenses. In: Proceedings of the 14th Loughborough Antennas and Propagation Conference (LAPC 2018): . Paper presented at Loughborough Antennas and Propagation Conference 2018, LAPC 2018, Loughborough, United Kingdom, 12-13 November, 2018. Piscataway, N.J.: IEEE
Open this publication in new window or tab >>An iterative approach to determine the refractive index of 3D printed 60GHz PLA lenses
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2018 (English)In: Proceedings of the 14th Loughborough Antennas and Propagation Conference (LAPC 2018), Piscataway, N.J.: IEEE, 2018Conference paper, Published paper (Refereed)
Abstract [en]

This paper describes an iterative approach to determine quasi-optical properties of standard 3D printer filament material to, in an inexpensive and fast way, construct focusing lenses for millimetre wave systems. Results from three lenses with different focal lengths are shown and discussed. The real part of the permittivity at 60GHz for polylactic acid (PLA) is in this paper determined to be εr=2.74. © 2018 Institution of Engineering and Technology. All rights reserved.

Place, publisher, year, edition, pages
Piscataway, N.J.: IEEE, 2018
Series
IET Conference Publications ; CP746
Keywords
Additive manufacturing, radar, lenses, quasi-optics
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:hh:diva-38454 (URN)10.1049/cp.2018.1480 (DOI)2-s2.0-85061380873 (Scopus ID)978-1-78561-969-4 (ISBN)
Conference
Loughborough Antennas and Propagation Conference 2018, LAPC 2018, Loughborough, United Kingdom, 12-13 November, 2018
Funder
Knowledge Foundation, 20160303
Available from: 2018-11-29 Created: 2018-11-29 Last updated: 2019-04-24Bibliographically approved
Taha, W., Duracz, A., Zeng, Y., Atkinson, K., Bartha, F. Á., Brauner, P., . . . Grante, C. (2016). Acumen: An Open-source Testbed for Cyber-Physical Systems Research. In: Benny Mandler, Johann Marquez-Barja, Miguel Elias Mitre Campista, Dagmar Cagáňová, Hakima Chaouchi, Sherali Zeadally, Mohamad Badra, Stefano Giordano, Maria Fazio, Andrey Somov & Radu-Laurentiu Vieriu (Ed.), Internet of Things. IoT Infrastructures: Second International Summit, IoT 360° 2015, Rome, Italy, October 27-29, 2015. Revised Selected Papers, Part I. Paper presented at EAI International Conference on CYber physiCaL systems, iOt and sensors Networks (CYCLONE '15), Rome, Italy, October 26, 2015 (pp. 118-130). Heidelberg: Springer, 169
Open this publication in new window or tab >>Acumen: An Open-source Testbed for Cyber-Physical Systems Research
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2016 (English)In: Internet of Things. IoT Infrastructures: Second International Summit, IoT 360° 2015, Rome, Italy, October 27-29, 2015. Revised Selected Papers, Part I / [ed] Benny Mandler, Johann Marquez-Barja, Miguel Elias Mitre Campista, Dagmar Cagáňová, Hakima Chaouchi, Sherali Zeadally, Mohamad Badra, Stefano Giordano, Maria Fazio, Andrey Somov & Radu-Laurentiu Vieriu, Heidelberg: Springer, 2016, Vol. 169, p. 118-130Conference paper, Published paper (Refereed)
Abstract [en]

Developing Cyber-Physical Systems requires methods and tools to support simulation and verification of hybrid (both continuous and discrete) models. The Acumen modeling and simulation language is an open source testbed for exploring the design space of what rigorous-but-practical next-generation tools can deliver to developers of Cyber-Physical Systems. Like verification tools, a design goal for Acumen is to provide rigorous results. Like simulation tools, it aims to be intuitive, practical, and scalable. However, it is far from evident whether these two goals can be achieved simultaneously.

This paper explains the primary design goals for Acumen, the core challenges that must be addressed in order to achieve these goals, the "agile research method" taken by the project, the steps taken to realize these goals, the key lessons learned, and the emerging language design. © ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2016.

Place, publisher, year, edition, pages
Heidelberg: Springer, 2016
Series
Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, ISSN 1867-8211 ; 169
Keywords
Testbed, Cyber-Physical Systems (CPS), Modeling, Simulation, Hybrid Systems, Open Source Software
National Category
Computer Sciences
Identifiers
urn:nbn:se:hh:diva-29592 (URN)10.1007/978-3-319-47063-4_11 (DOI)000398616500011 ()2-s2.0-85000500985 (Scopus ID)978-3-319-47062-7 (ISBN)978-3-319-47063-4 (ISBN)
Conference
EAI International Conference on CYber physiCaL systems, iOt and sensors Networks (CYCLONE '15), Rome, Italy, October 26, 2015
Funder
Knowledge FoundationVINNOVA, 2011-01819
Note

This work was supported by US NSF award CPS-1136099, the Swedish Knowledge Foundation (KK), The Center for Research on Embedded Systems (CERES), and VINNOVA (Dnr. 2011-01819).

Available from: 2015-10-08 Created: 2015-10-08 Last updated: 2021-05-11Bibliographically approved
Persson, A. I., Enquist, H., Jurgilaitis, A., Andreasson, B. P. & Larsson, J. (2015). Real-time observation of coherent acoustic phonons generated by an acoustically mismatched optoacoustic transducer using x-ray diffraction. Journal of Applied Physics, 118(18), Article ID 185308.
Open this publication in new window or tab >>Real-time observation of coherent acoustic phonons generated by an acoustically mismatched optoacoustic transducer using x-ray diffraction
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2015 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 118, no 18, article id 185308Article in journal (Refereed) Published
Abstract [en]

The spectrum of laser-generated acoustic phonons in indium antimonide coated with a thin nickel film has been studied using time-resolved x-ray diffraction. Strain pulses that can be considered to be built up from coherent phonons were generated in the nickel film by absorption of short laser pulses. Acoustic reflections at the Ni-InSb interface leads to interference that strongly modifies the resulting phonon spectrum. The study was performed with high momentum transfer resolution together with high time resolution. This was achieved by using a third-generation synchrotron radiation source that provided a high-brightness beam and an ultrafast x-ray streak camera to obtain a temporal resolution of 10 ps. We also carried out simulations, using commercial finite element software packages and on-line dynamic diffraction tools. Using these tools, it is possible to calculate the time-resolved x-ray reflectivity from these complicated strain shapes. The acoustic pulses have a peak strain amplitude close to 1%, and we investigated the possibility to use this device as an x-ray switch. At a bright source optimized for hard x-ray generation, the low reflectivity may be an acceptable trade-off to obtain a pulse duration that is more than an order of magnitude shorter. © 2015 Author(s).

Place, publisher, year, edition, pages
New York: American Institute of Physics (AIP), 2015
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:hh:diva-29816 (URN)10.1063/1.4935269 (DOI)000365041700042 ()2-s2.0-84947231955 (Scopus ID)
Available from: 2015-11-25 Created: 2015-11-25 Last updated: 2020-05-11Bibliographically approved
Jurgilaitis, A., Enquist, H., Andreasson, B. P., Persson, A. I., Borg, B. M., Caroff, P., . . . Larsson, J. (2014). Time-Resolved X-ray Diffraction Investigation of the Modified Phonon Dispersion in InSb Nanowires. Nano letters (Print), 14(2), 541-546
Open this publication in new window or tab >>Time-Resolved X-ray Diffraction Investigation of the Modified Phonon Dispersion in InSb Nanowires
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2014 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 14, no 2, p. 541-546Article in journal (Refereed) Published
Abstract [en]

The modified phonon dispersion is of importance for understanding the origin of the reduced heat conductivity in nanowires. We have measured the phonon dispersion for 50 nm diameter InSb (111) nanowires using time-resolved X-ray diffraction. By comparing the sound speed of the bulk (3880 m/s) and that of a classical thin rod (3600 m/s) to our measurement (2880 m/s), we conclude that the origin of the reduced sound speed and thereby to the reduced heat conductivity is that the C44 elastic constant is reduced by 35% compared to the bulk material. © 2014 American Chemical Society.

Place, publisher, year, edition, pages
Washington, DC: American Chemical Society (ACS), 2014
Keywords
elastic properties, indium antimonide, Nanowires, thermal conductivity, time dependent, X-ray diffraction
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:hh:diva-26520 (URN)10.1021/nl403596b (DOI)000331343900022 ()24387246 (PubMedID)2-s2.0-84894178785 (Scopus ID)
Available from: 2014-09-17 Created: 2014-09-17 Last updated: 2017-12-05Bibliographically approved
Pham, T. V., Rao, M., Andreasson, B. P., Peng, Y., Wang, J. & Jinesh, K. B. (2013). Photocarrier generation in CuxO thin films deposited by radio frequency sputtering. Applied Physics Letters, 102(3), Article number: 032101
Open this publication in new window or tab >>Photocarrier generation in CuxO thin films deposited by radio frequency sputtering
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2013 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 102, no 3, p. Article number: 032101-Article in journal (Refereed) Published
Abstract [en]

Copper oxides (CuxO) thin films were deposited using radio frequency (RF) sputtering on glass substrates. By tuning the argon (Ar) partial pressure during deposition, cuprous oxide (Cu2O), cupric oxide (CuO), or their mixed phase could be achieved. Drastic variations in the Hall mobility, hole density, and resistivity of the samples were observed due to the presence of different phases in the films. Kelvin probe studies indicate that the photo-generated carriers have lower recombination rate in pure Cu 2O phase. This was further validated by transient absorption measurements, where the estimated carrier lifetime for Cu2O was much larger that other phases. © 2013 American Institute of Physics.

Place, publisher, year, edition, pages
College Park, MD: American Institute of Physics (AIP), 2013
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:hh:diva-26521 (URN)10.1063/1.4788680 (DOI)000314032600045 ()2-s2.0-84872934025 (Scopus ID)
Available from: 2014-09-17 Created: 2014-09-17 Last updated: 2017-12-05Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-3764-4235

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