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Hallbjoerner, Paul
Alternative names
Publications (10 of 27) Show all publications
Gruden, M., Hallbjorner, P. & Rydberg, A. (2013). Large Ad Hoc Shielded Room with Removable Mode Stirrer for Mobile Phone Antenna Tests. IEEE transactions on electromagnetic compatibility (Print), 55(1), 21-27
Open this publication in new window or tab >>Large Ad Hoc Shielded Room with Removable Mode Stirrer for Mobile Phone Antenna Tests
2013 (English)In: IEEE transactions on electromagnetic compatibility (Print), ISSN 0018-9375, E-ISSN 1558-187X, Vol. 55, no 1, p. 21-27Article in journal (Refereed) Published
Abstract [en]

Reverberation chambers (RC) are widely used for measuring antenna performance and parameters for MIMO systems. RCs for mobile phone antenna tests are often specially designed for this purpose. The lowest frequency of operation of an RC is decided by its size. With a trend of lower frequency bands being allocated for mobile phones, the minimum size of RCs for mobile phone antenna tests increases, and is approaching the size of a normal room. At the same time, many large shielded rooms are already in use for various electrical measurements. In this paper, a standard shielded room designed for EMC testing is used as an RC for mobile phone antenna tests. To complete the RC, a large mode stirrer is built. The fact that the room is also used for other tests requires a detachable, foldable, and lightweight stirrer design. Therefore, metal meshes are evaluated for the design of the mode stirrer. The performance of the used room is verified by standard tests for RCs, and it is verified that it is possible to measure antennas from about 400 MHz up to 4 GHz with good accuracy. The size of the room also enables measurements including humans carrying mobile phones or body area networks.

Keywords
Antenna measurements, electromagnetic propagation, electromagnetic shielding, microwave communication, microwave radio propagation
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Electronics
Identifiers
urn:nbn:se:uu:diva-197409 (URN)10.1109/TEMC.2012.2204758 (DOI)000315118100003 ()
Available from: 2013-03-28 Created: 2013-03-25 Last updated: 2017-12-06Bibliographically approved
Marin-Soler, A., Grudén, M., Sanchez-Heredia, J. D., Hallbjorner, P., Martinez-Gonzalez, A. M., Rydberg, A. & Sanchez-Hernandez, D. A. (2012). Sample Selection Algorithms for Enhanced MIMO Antenna Measurements Using Mode-Stirred Reverberation Chambers. IEEE Transactions on Antennas and Propagation, 60(8), 3892-3900
Open this publication in new window or tab >>Sample Selection Algorithms for Enhanced MIMO Antenna Measurements Using Mode-Stirred Reverberation Chambers
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2012 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 60, no 8, p. 3892-3900Article in journal (Refereed) Published
Abstract [en]

Mode-stirred reverberation chambers (MSRCs) are a useful tool for measuring several wireless-related MIMO antenna parameters. In a conventional single-cavity MSRC, the emulated fading environment is isotropic and the amplitude of the signal is Rayleigh distributed. Previous contributions have enhanced the emulation capabilities of MSRCs so as to include the ability to emulate Rician- and non-isotropic fading environments. In this contribution, arbitrary amplitude probability density functions (PDF) emulation using a MSRC is presented by selecting parts of the sample set that forms different statistical ensembles. Several algorithms are presented and compared in terms of computation time and power accuracy using simulated as well as measured data from different MSRCs to obtain Rician, on-body and amplitude PDFs of standardized models. The technique is patent-protected by EMITE.

Keywords
Algorithms, antenna measurements, fading channels, genetic algorithms
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Electronics
Identifiers
urn:nbn:se:uu:diva-182546 (URN)10.1109/TAP.2012.2201103 (DOI)000308435800037 ()
Available from: 2012-10-11 Created: 2012-10-11 Last updated: 2017-12-07Bibliographically approved
Jobs, M., Grundén, M., Hallbjorner, P. & Rydberg, A. (2010). Antenna diversity with opportunistic combining for ASk systems with single channel receivers. In: Proceedings of the Fourth European Conference on Antennas and Propagation (EuCAP): . Paper presented at Fourth European Conference on Antennas and Propagation (EuCAP) (pp. 1-5).
Open this publication in new window or tab >>Antenna diversity with opportunistic combining for ASk systems with single channel receivers
2010 (English)In: Proceedings of the Fourth European Conference on Antennas and Propagation (EuCAP), 2010, p. 1-5Conference paper, Published paper (Refereed)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-138838 (URN)
Conference
Fourth European Conference on Antennas and Propagation (EuCAP)
Projects
WISENET
Available from: 2010-12-20 Created: 2010-12-20 Last updated: 2016-04-18Bibliographically approved
Rydberg, A., Westman, A., Grundén, M., Platbardis, J. & Hallbjörner, P. (2010). Techniques for communication robustness in train environment. In: : . Paper presented at Conference GigaHertz2010, Lund, Sweden, 9/3 - 10/3, 2010.
Open this publication in new window or tab >>Techniques for communication robustness in train environment
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2010 (English)Conference paper, Published paper (Refereed)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-138834 (URN)
Conference
Conference GigaHertz2010, Lund, Sweden, 9/3 - 10/3, 2010
Projects
WISENET
Available from: 2010-12-20 Created: 2010-12-20 Last updated: 2016-04-19Bibliographically approved
Jaff, B., Jobs, M., Lantz, F., Lewin, B., Jansson, E., Antoni, J., . . . Rydberg, A. (2009). A wireless body area network (WBAN) based tracking and monitoring application system. In: Seminar on Antennas and Propagation for body-centric wireless communications, London, UK: . Paper presented at Seminar on Antennas and Propagation for body-centric wireless communications, London, UK.
Open this publication in new window or tab >>A wireless body area network (WBAN) based tracking and monitoring application system
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2009 (English)In: Seminar on Antennas and Propagation for body-centric wireless communications, London, UK, 2009Conference paper, Published paper (Refereed)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Microwave Technology
Identifiers
urn:nbn:se:uu:diva-121248 (URN)
Conference
Seminar on Antennas and Propagation for body-centric wireless communications, London, UK
Projects
WISENET
Available from: 2010-03-19 Created: 2010-03-19 Last updated: 2016-04-14Bibliographically approved
Cheng, S., Hallbjörner, P. & Rydberg, A. (2009). Array antenna for body-worn automotive harmonic radar tag. In: : . Paper presented at The 3rd European Conference on Antennas and Propagation (EuCAP) (pp. 2823-2827).
Open this publication in new window or tab >>Array antenna for body-worn automotive harmonic radar tag
2009 (English)Conference paper, Published paper (Refereed)
National Category
Signal Processing
Research subject
Engineering Science with specialization in Microwave Technology
Identifiers
urn:nbn:se:uu:diva-111195 (URN)
Conference
The 3rd European Conference on Antennas and Propagation (EuCAP)
Projects
WISENET
Available from: 2009-12-06 Created: 2009-12-06 Last updated: 2016-04-14
van Engen, P., Cheng, S., van Doremalen, R., Sanduleanu, M., Rydberg, A., Hjort, K. & Hallbjörner, P. (2009). Body surface backed flexible antennas and 3D Si-level integrated wireless sensor nodes for 17 GHz wireless body area networks. In: Seminar at Antennas and Propagation for Body-Centric Wireless Communications, London, UK: . Paper presented at Seminar at Antennas and Propagation for Body-Centric Wireless Communications, London, UK.
Open this publication in new window or tab >>Body surface backed flexible antennas and 3D Si-level integrated wireless sensor nodes for 17 GHz wireless body area networks
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2009 (English)In: Seminar at Antennas and Propagation for Body-Centric Wireless Communications, London, UK, 2009Conference paper, Published paper (Refereed)
National Category
Signal Processing
Research subject
Engineering Science with specialization in Microwave Technology
Identifiers
urn:nbn:se:uu:diva-121051 (URN)
Conference
Seminar at Antennas and Propagation for Body-Centric Wireless Communications, London, UK
Projects
WISENET
Available from: 2010-03-18 Created: 2010-03-18 Last updated: 2016-04-14Bibliographically approved
Hallbjörner, P., Grudèn, M. & Jobs, M. (2009). Broadband Space-Time Measurements in Reverberation Chamber Including Comparison With Real Environment. IEEE Antennas and Wireless Propagation Letters, 8, 1111-1114
Open this publication in new window or tab >>Broadband Space-Time Measurements in Reverberation Chamber Including Comparison With Real Environment
2009 (English)In: IEEE Antennas and Wireless Propagation Letters, ISSN 1536-1225, E-ISSN 1548-5757, Vol. 8, p. 1111-1114Article in journal (Refereed) Published
Abstract [en]

Spatial variations of the broadband time-domain impulse response in a reverberation chamber are studied experimentally. The goal is to introduce the technique as a means for characterizing reverberation chambers and to demonstrate typical results and the information that can be extracted. Similar measurements are performed in a lab room for comparison. The results provide new insights regarding the signal environment inside a reverberation chamber and how it compares to real-life environments. The minimum number of signal paths in the chamber is calculated based on the spatial and temporal resolutions used in the characterization.

Keywords
Antenna measurements, reverberation chamber, space-time measurements, time domain measurements
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-127435 (URN)10.1109/LAWP.2009.2033825 (DOI)000271440900004 ()
Available from: 2010-07-14 Created: 2010-07-13 Last updated: 2017-12-12Bibliographically approved
Cheng, S., Hallbjörner, P., Rydberg, A., Vanotterdijk, D. & van Engen, P. (2009). Design and characterization methods for a balanced antenna integrated in a small sensor node. In: Seminar at Antennas and Propagation for Body-Centric Wireless Communications, London, UK: . Paper presented at Seminar at Antennas and Propagation for Body-Centric Wireless Communications, London, UK.
Open this publication in new window or tab >>Design and characterization methods for a balanced antenna integrated in a small sensor node
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2009 (English)In: Seminar at Antennas and Propagation for Body-Centric Wireless Communications, London, UK, 2009Conference paper, Published paper (Refereed)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Microwave Technology
Identifiers
urn:nbn:se:uu:diva-121254 (URN)
Conference
Seminar at Antennas and Propagation for Body-Centric Wireless Communications, London, UK
Projects
WISENET
Available from: 2010-03-19 Created: 2010-03-19 Last updated: 2016-04-14Bibliographically approved
Cheng, S., Wu, Z., Hallbjörner, P., Hjort, K. & Rydberg, A. (2009). Foldable and stretchable liquid metal planar inverted cone antenna. IEEE Transactions on Antennas and Propagation, 57(12), 3765-3771
Open this publication in new window or tab >>Foldable and stretchable liquid metal planar inverted cone antenna
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2009 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 57, no 12, p. 3765-3771Article in journal (Refereed) Published
Abstract [en]

A mechanically flexible planar inverted cone antenna (PICA) for   ultrawideband (UWB) applications is presented. It can be both folded   and stretched significantly without permanent damage or loss of   electrical functionality. The antenna is manufactured with a process in   which conductors are realized by injecting room temperature liquid   metal alloy into micro-structured channels in an elastic dielectric   material. The elastic dielectric material together with the liquid   metal enables bending with a very small radius, twisting, and   stretching along any direction. Port impedance and radiation   characteristics of the non-stretched and stretched antenna are studied   in simulations and experiments. The presented antenna has a return loss   better than 10 dB within 3-11 GHz and a radiation efficiency of > 70%   over 3-10 GHz, also when stretched. Tests verify that stretching up to   40% is possible with maintained electrical performance. The presented   antenna is useful for example for body-worn antennas and in   applications in harsh environments where mechanical flexibility helps   improve durability.

Keywords
Liquid alloy, planar inverted cone antenna (PICA), polydimethylsiloxane (PDMS), stretchable electronics, ultrawideband (UWB)
National Category
Signal Processing
Research subject
Engineering Science with specialization in Microwave Technology
Identifiers
urn:nbn:se:uu:diva-111193 (URN)10.1109/TAP.2009.2024560 (DOI)000272313500013 ()
Projects
wisenet
Available from: 2009-12-06 Created: 2009-12-06 Last updated: 2017-12-12Bibliographically approved
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