hh.sePublikationer
Ändra sökning
Länk till posten
Permanent länk

Direktlänk
Publikationer (10 of 26) Visa alla publikationer
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.
Öppna denna publikation i ny flik eller fönster >>SIW-based frequency-adjustable antenna for IoT-based duplex wireless devices
Visa övriga...
2024 (Engelska)Ingår i: AEU - International Journal of Electronics and Communications, ISSN 1434-8411, E-ISSN 1618-0399, Vol. 173, artikel-id 155019Artikel i tidskrift (Refereegranskat) 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

Ort, förlag, år, upplaga, sidor
München: Elsevier, 2024
Nyckelord
Dielectric rod, Duplex antenna, EMSIW antenna, WLAN band
Nationell ämneskategori
Annan elektroteknik och elektronik
Identifikatorer
urn:nbn:se:hh:diva-52172 (URN)10.1016/j.aeue.2023.155019 (DOI)001118353100001 ()2-s2.0-85177200335 (Scopus ID)
Anmärkning

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

Tillgänglig från: 2023-12-01 Skapad: 2023-12-01 Senast uppdaterad: 2024-01-17Bibliografiskt granskad
Guarese, R., Andreasson, P., Nilsson, E. & Maciel, A. (2021). Augmented situated visualization methods towards electromagnetic compatibility testing. Computers & graphics, 94, 1-10
Öppna denna publikation i ny flik eller fönster >>Augmented situated visualization methods towards electromagnetic compatibility testing
2021 (Engelska)Ingår i: Computers & graphics, ISSN 0097-8493, E-ISSN 1873-7684, Vol. 94, s. 1-10Artikel i tidskrift (Refereegranskat) 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

Ort, förlag, år, upplaga, sidor
Oxford: Elsevier, 2021
Nyckelord
Augmented reality, Visualization, 3D interaction, Situated analytics, Electromagnetic compatibility
Nationell ämneskategori
Inbäddad systemteknik
Identifikatorer
urn:nbn:se:hh:diva-43698 (URN)10.1016/j.cag.2020.10.001 (DOI)2-s2.0-85093689729 (Scopus ID)
Anmärkning

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.

Tillgänglig från: 2020-12-14 Skapad: 2020-12-14 Senast uppdaterad: 2021-04-13Bibliografiskt granskad
Aydogdu, C., Keskin, M. F., Carvajal, G. K., Eriksson, O., Hellsten, H., Herbertsson, H., . . . Wymeersch, H. (2021). Radar Interference Mitigation through Active Coordination. In: 2021 IEEE Radar Conference (RadarConf21): . Paper presented at 2021 IEEE Radar Conference, RadarConf 2021, Atlanta, USA, 08-14/05, 2021 (pp. 1-6). IEEE
Öppna denna publikation i ny flik eller fönster >>Radar Interference Mitigation through Active Coordination
Visa övriga...
2021 (Engelska)Ingår i: 2021 IEEE Radar Conference (RadarConf21), IEEE, 2021, s. 1-6Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Intelligent transportation is heavily reliant on radar, which have unique robustness under heavy rain/fog/snow and poor light conditions. With the rapid increase of the number of radars used on modern vehicles, most operating in the same frequency band, the risk of radar interference becomes an important issue. As in radio communication, interference can be mitigated through coordination. We present and evaluate two approaches for radar interference coordination, one for FMCW and one for OFDM, and highlight their challenges and opportunities. © 2021 IEEE.

Ort, förlag, år, upplaga, sidor
IEEE, 2021
Nationell ämneskategori
Telekommunikation
Identifikatorer
urn:nbn:se:hh:diva-46085 (URN)10.1109/RadarConf2147009.2021.9455180 (DOI)000687846300045 ()2-s2.0-85112461816 (Scopus ID)978-1-7281-7609-3 (ISBN)978-1-7281-7610-9 (ISBN)
Konferens
2021 IEEE Radar Conference, RadarConf 2021, Atlanta, USA, 08-14/05, 2021
Forskningsfinansiär
Vinnova, 2018-01929
Tillgänglig från: 2021-12-13 Skapad: 2021-12-13 Senast uppdaterad: 2023-10-05Bibliografiskt granskad
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
Öppna denna publikation i ny flik eller fönster >>A proposal for augmented situated visualization towards EMC testing
2020 (Engelska)Ingår i: CEUR Workshop Proceedings / [ed] Moser T.; Bruckner F., CEUR-WS , 2020, Vol. 2618, s. 12-15Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
CEUR-WS, 2020
Serie
CEUR Workshop Proceedings, ISSN 1613-0073 ; 2618
Nyckelord
Human-centered computing - Visualization - Visualization design and evaluation methods, Human-centered computing - Visualization - Visualization techniques - Treemaps
Nationell ämneskategori
Människa-datorinteraktion (interaktionsdesign)
Identifikatorer
urn:nbn:se:hh:diva-44698 (URN)2-s2.0-85087841200 (Scopus ID)
Konferens
2020 XChange Reality!, XCR 2020, 27-30/04, St. Polten, aut, 2020
Tillgänglig från: 2021-06-14 Skapad: 2021-06-14 Senast uppdaterad: 2021-06-14Bibliografiskt granskad
Carvajal, G. K., Keskin, M. F., Aydogdu, C., Eriksson, O., Herbertsson, H., Hellsten, H., . . . Wymeersch, H. (2020). Comparison of Automotive FMCW and OFDM Radar Under Interference. In: 2020 IEEE Radar Conference (RadarConf20): . Paper presented at 2020 IEEE Radar Conference (RadarConf20), Florence, Italy, 21-25 Sept., 2020 (pp. 1-6). New York, NY: IEEE
Öppna denna publikation i ny flik eller fönster >>Comparison of Automotive FMCW and OFDM Radar Under Interference
Visa övriga...
2020 (Engelska)Ingår i: 2020 IEEE Radar Conference (RadarConf20), New York, NY: IEEE, 2020, s. 1-6Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Automotive radars are subject to interference in spectrally congested environments. To mitigate this interference, various waveforms have been proposed. We compare two waveforms (FMCW and OFDM) in terms of their radar performance and robustness to interference, under similar parameter settings. Our results indicate that under proper windowing both waveforms can achieve similar performance, but OFDM is more sensitive to interference. ©2020 IEEE

Ort, förlag, år, upplaga, sidor
New York, NY: IEEE, 2020
Serie
The proceedings of the ... IEEE National Radar Conference, ISSN 1097-5659, E-ISSN 2375-5318
Nationell ämneskategori
Inbäddad systemteknik Signalbehandling
Identifikatorer
urn:nbn:se:hh:diva-43700 (URN)10.1109/RadarConf2043947.2020.9266449 (DOI)2-s2.0-85098594714 (Scopus ID)978-1-7281-8942-0 (ISBN)978-1-7281-8943-7 (ISBN)
Konferens
2020 IEEE Radar Conference (RadarConf20), Florence, Italy, 21-25 Sept., 2020
Forskningsfinansiär
Vinnova, 2018-01929
Tillgänglig från: 2020-12-14 Skapad: 2020-12-14 Senast uppdaterad: 2021-07-06Bibliografiskt granskad
Hellsten, H. & Nilsson, E. (2020). Multiple Access Radar Using Slow Chirp Modulation. In: 2020 IEEE Radar Conference (RadarConf20): . Paper presented at 2020 IEEE Radar Conference (RadarConf20), Florence, Italy, 21-25 Sept., 2020 (pp. 1-6). New York, NY: IEEE
Öppna denna publikation i ny flik eller fönster >>Multiple Access Radar Using Slow Chirp Modulation
2020 (Engelska)Ingår i: 2020 IEEE Radar Conference (RadarConf20), New York, NY: IEEE, 2020, s. 1-6Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

The cohabitation of several radars, operating in the same frequency band, has become an essential and urgent topic as active safety systems for automotive applications are rolled out. An obvious concern is that mutual interference must be managed. Separating users in time, i.e. TDMA, achieves the required level of isolation in a straightforward way. CDMA techniques providing sufficient channel isolation are less obvious. The paper develops an alternative CDMA method, called Slow Chirp Modulation (SCM). SCM utilizes the full coherent integration time for transmission of a single aperiodic but ergodic signal, allowing target range and velocity to be retrieved but minimizing spectral occupancy. Spectral efficiency two orders of magnitude higher than for the discussed alternative methods is obtained, allowing more than a thousand non-interfering channels. Relying on indicated hardware schematics, the paper demonstrates the functionality of the novel signal processing algorithms, which are required for SCM. ©2020 IEEE

Ort, förlag, år, upplaga, sidor
New York, NY: IEEE, 2020
Serie
The proceedings of the ... IEEE National Radar Conference, ISSN 1097-5659, E-ISSN 2375-5318
Nyckelord
Radar signal processing, Chirp, Frequency modulation, OFDM, Automotive electronics
Nationell ämneskategori
Inbäddad systemteknik Signalbehandling
Identifikatorer
urn:nbn:se:hh:diva-43699 (URN)10.1109/RadarConf2043947.2020.9266520 (DOI)978-1-7281-8942-0 (ISBN)978-1-7281-8943-7 (ISBN)
Konferens
2020 IEEE Radar Conference (RadarConf20), Florence, Italy, 21-25 Sept., 2020
Forskningsfinansiär
Vinnova, 2018-01929
Tillgänglig från: 2020-12-14 Skapad: 2020-12-14 Senast uppdaterad: 2020-12-14Bibliografiskt granskad
Aydogdu, C., Keskin, M. F., Carvajal, G. K., Eriksson, O., Hellsten, H., Herbertsson, H., . . . Wymeersch, H. (2020). Radar Interference Mitigation for Automated Driving: Exploring Proactive Strategies. IEEE signal processing magazine (Print), 37(4), 72-84, Article ID 9127843.
Öppna denna publikation i ny flik eller fönster >>Radar Interference Mitigation for Automated Driving: Exploring Proactive Strategies
Visa övriga...
2020 (Engelska)Ingår i: IEEE signal processing magazine (Print), ISSN 1053-5888, E-ISSN 1558-0792, Vol. 37, nr 4, s. 72-84, artikel-id 9127843Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Autonomous driving relies on a variety of sensors, especially radars, which have unique robustness under heavy rain/fog/snow and poor light conditions. With the rapid increase of the amount of radars used on modern vehicles, where most radars operate in the same frequency band, the risk of radar interference becomes a compelling issue. This article analyzes automotive radar interference and proposes several new approaches that combine industrial and academic expertise toward the goal of achieving interference-free autonomous driving (AD). © IEEE.

Ort, förlag, år, upplaga, sidor
Piscataway: Institute of Electrical and Electronics Engineers (IEEE), 2020
Nyckelord
Automotive radar, Autonomous vehicles, Radar signal processing, Automated driving, Autonomous driving, Heavy rains, Interference mitigation, Interference-free, Light conditions, New approaches, Radar interference
Nationell ämneskategori
Signalbehandling
Identifikatorer
urn:nbn:se:hh:diva-43296 (URN)10.1109/MSP.2020.2969319 (DOI)000545430400010 ()2-s2.0-85087917101 (Scopus ID)
Forskningsfinansiär
Vinnova, 2018-01929
Tillgänglig från: 2020-10-20 Skapad: 2020-10-20 Senast uppdaterad: 2020-10-20Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>3D Printed Radar Lenses with Anti-Reflective Structures
2019 (Engelska)Ingår i: Designs, E-ISSN 2411-9660, Vol. 3, nr 2, artikel-id 28Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
Basel: MDPI, 2019
Nyckelord
radar, 3D printing, lenses, anti-reflective coatings, millimeter wave radar, simulation, additive manufacturing, quasi-optics
Nationell ämneskategori
Annan elektroteknik och elektronik
Identifikatorer
urn:nbn:se:hh:diva-39695 (URN)10.3390/designs3020028 (DOI)2-s2.0-85087497229 (Scopus ID)
Forskningsfinansiär
KK-stiftelsen, 2016/0303
Tillgänglig från: 2019-06-11 Skapad: 2019-06-11 Senast uppdaterad: 2021-06-03Bibliografiskt granskad
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
Öppna denna publikation i ny flik eller fönster >>An iterative approach to determine the refractive index of 3D printed 60GHz PLA lenses
Visa övriga...
2018 (Engelska)Ingår i: Proceedings of the 14th Loughborough Antennas and Propagation Conference (LAPC 2018), Piscataway, N.J.: IEEE, 2018Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
Piscataway, N.J.: IEEE, 2018
Serie
IET Conference Publications ; CP746
Nyckelord
Additive manufacturing, radar, lenses, quasi-optics
Nationell ämneskategori
Annan elektroteknik och elektronik
Identifikatorer
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)
Konferens
Loughborough Antennas and Propagation Conference 2018, LAPC 2018, Loughborough, United Kingdom, 12-13 November, 2018
Forskningsfinansiär
KK-stiftelsen, 20160303
Tillgänglig från: 2018-11-29 Skapad: 2018-11-29 Senast uppdaterad: 2019-04-24Bibliografiskt granskad
Ernst, R., Nilsson, E. & Viberg, P.-A. (2016). 60GHz Vital Sign Radar using 3D-printed Lens. In: 2016 IEEE SENSORS: . Paper presented at 15th IEEE Sensors Conference, SENSORS 2016; Convention Center at the Caribe Royale Hotel, Orlando; United States; 30 October 2016 through 2 November 2016. Piscataway: IEEE, Article ID 7808774.
Öppna denna publikation i ny flik eller fönster >>60GHz Vital Sign Radar using 3D-printed Lens
2016 (Engelska)Ingår i: 2016 IEEE SENSORS, Piscataway: IEEE, 2016, artikel-id 7808774Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

There is an increased interest in contact-less vital sign monitoring methods as they offer higher flexibility to the individual being observed. Recent industrial development enabled radar functionality to be packed in single-chip solutions, decreasing application complexity and speeding up designs. Within this paper, a vital sign radar has been developed utilizing a recently released 60GHz frequency modulated continuous wave single-chip radar in combination with 3D-printed quasi-optics. The electronics development has been focused on compactness and high system integration using a low cost design process. The final experiments prove that the radar is capable of tracking human respiration rate and heartbeat at the same time from a distance of 1m.

Ort, förlag, år, upplaga, sidor
Piscataway: IEEE, 2016
Serie
IEEE Sensors, ISSN 1930-0395
Nyckelord
3D printers, Frequency modulation, Patient monitoring, Radar, Tracking radar
Nationell ämneskategori
Produktionsteknik, arbetsvetenskap och ergonomi Övrig annan teknik Inbäddad systemteknik Annan elektroteknik och elektronik
Identifikatorer
urn:nbn:se:hh:diva-35654 (URN)10.1109/ICSENS.2016.7808774 (DOI)000399395700361 ()2-s2.0-85010992192 (Scopus ID)978-1-4799-8287-5 (ISBN)978-1-4799-8288-2 (ISBN)
Konferens
15th IEEE Sensors Conference, SENSORS 2016; Convention Center at the Caribe Royale Hotel, Orlando; United States; 30 October 2016 through 2 November 2016
Tillgänglig från: 2017-12-01 Skapad: 2017-12-01 Senast uppdaterad: 2022-11-01Bibliografiskt granskad
Projekt
Samexisterande Radar [2016-03940_Vinnova]; Högskolan i Halmstad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0003-2783-7460

Sök vidare i DiVA

Visa alla publikationer