Change search
Link to record
Permanent link

Direct link
BETA
Tenhunen, Hannu
Publications (10 of 92) Show all publications
Ahmad, A., Arshad, F., Naqvi, S. I., Amin, Y., Tenhunen, H. & Loo, J. (2020). Flexible and Compact Spiral-Shaped Frequency Reconfigurable Antenna for Wireless Applications. Journal of the Institution of Electronics and Telecommunication Engineers, 66(1), 22-29
Open this publication in new window or tab >>Flexible and Compact Spiral-Shaped Frequency Reconfigurable Antenna for Wireless Applications
Show others...
2020 (English)In: Journal of the Institution of Electronics and Telecommunication Engineers, ISSN 0377-2063, E-ISSN 0974-780X, Vol. 66, no 1, p. 22-29Article in journal (Refereed) Published
Abstract [en]

A flexible, spiral-shaped frequency reconfigurable antenna with a compact size (20 x 24 mm(2)) is presented. The proposed antenna has a low-profile planar structure and is able to operate at five different frequency bands, i.e., 4.19-4.48, 5.98-6.4, 3.42-4.0, 5.4-5.68, and 6.8-7.0 GHz. The multiband operation enables the antenna to cover aeronautical radio navigation, fixed satellite communication, WLAN, and WiMAX standards. A radiating element is backed by Rogers (R) 5880 substrate with a thickness of 0.508 mm and dielectric constant of 2.2. The spiral shape is achieved by introducing different strips. Frequency reconfiguration is achieved by the incorporation of a lumped element in a strip, so that the antenna can switch between different resonances. To validate the performance of the antenna, the prototype of the design was fabricated and tested. Good acquiescent is seen between simulated and measured results. The proposed antenna operates efficiently with appreciable return loss, directivity, bandwidth, and peak gain.

Place, publisher, year, edition, pages
TAYLOR & FRANCIS LTD, 2020
Keywords
AMT fixed services, Flexible antenna, Reconfigurable, Satellite, WiMAX, WLAN
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-269034 (URN)10.1080/03772063.2018.1477629 (DOI)000512679800004 ()2-s2.0-85048822631 (Scopus ID)
Note

QC 20200311

Available from: 2020-03-11 Created: 2020-03-11 Last updated: 2020-03-11Bibliographically approved
Kelati, A., Plosila, J. & Tenhunen, H. (2020). Machine Learning for sEMG Facial Feature Characterization. In: Signal Processing Algorithms, Architectures, Arrangements and Applications (SPA): . Paper presented at 2019 Signal Processing: Algorithms, Architectures, Arrangements, and Applications (SPA) (pp. 169-174). Poznan, Poland: IEEE
Open this publication in new window or tab >>Machine Learning for sEMG Facial Feature Characterization
2020 (English)In: Signal Processing Algorithms, Architectures, Arrangements and Applications (SPA), Poznan, Poland: IEEE, 2020, p. 169-174Conference paper, Published paper (Refereed) [Artistic work]
Abstract [en]

Wearable e-health system, are frequently used for monitoring biomedical signals. These devices need to have advanced and applicable methods of feature selection and classifications for real time applications. Electromyogram (EMG) signal records the movement of the human muscle. EMG signal processing techniques aim to achieve the actual signal and among others, detect the state of signals related to positive and negative emotional expression. In our study, the data collected is from the facial muscle activity that is produced by the emotion of the facial expressions. The key challenge is in finding an accurate classification method of the measured signals. This paper investigates the promising techniques for the detection and classification of EMG signal using machinelearning theory. Here, we demonstrated Support Vector Machine (SVM) is an optimal method for classification of facial surface Electromyogram (sEMG) signal associated to pain dataset. The test results and the methods are able to analyze the patterns recognition of facial EMG signal classification. The result and the findings 99% accuracy with SVM method adds value on the classification algorithms of our EMG signal acquisitions platform.

Place, publisher, year, edition, pages
Poznan, Poland: IEEE, 2020
Keywords
— machine learning, facial sEMG, biosignal, classifications, support vector machine (SVM)
National Category
Engineering and Technology
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-266249 (URN)10.23919/SPA.2019.8936818 (DOI)2-s2.0-85077730663 (Scopus ID)
Conference
2019 Signal Processing: Algorithms, Architectures, Arrangements, and Applications (SPA)
Note

QC 20200115

Available from: 2020-01-03 Created: 2020-01-03 Last updated: 2020-03-09Bibliographically approved
Javed, A., Naqvi, S. I., Arshad, F., Amin, Y. & Tenhunen, H. (2019). A Bowtie Slotted Quad-Band Notched UWB Antenna with Defected Ground Structure. APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY JOURNAL, 34(11), 1725-1730
Open this publication in new window or tab >>A Bowtie Slotted Quad-Band Notched UWB Antenna with Defected Ground Structure
Show others...
2019 (English)In: APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY JOURNAL, ISSN 1054-4887, Vol. 34, no 11, p. 1725-1730Article in journal (Refereed) Published
Abstract [en]

A novel compact bowtie slotted circular patch antenna with quad-band notched characteristics is demonstrated in this work. The presented prototype is ascertained on FR-4 substrate. Initially, an Ultra-Wideband (3.1-10.6 GHz) antenna is achieved. Later, undesirable bands between 3.55-5.16, 5.52-5.73, 6.44-6.78 and 7.61-10.6 GHz are eliminated by incorporating slots in the patch. By proper optimization of the patch as well as ground plane, four resonant bands are achieved between 2.56-3.53, 5.22-5.5, 5.7-6.4 and 6.81-7.53 GHz supporting LTE2500, WiMAX, WLAN, and X-band applications. For good impedance matching, the antenna employs a very unique bat-shaped defected ground plane structure. The peak gain of 3.7 dB is obtained by the proposed radiator. A good agreement is observed between the measured and simulated results.

Place, publisher, year, edition, pages
APPLIED COMPUTATIONAL ELECTROMAGNETICS SOC, 2019
Keywords
Bowtie slotted antenna, defected ground structure (DGS), notched bands, WiMAX, WLAN, X-band
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-266420 (URN)000503441900014 ()2-s2.0-85077943008 (Scopus ID)
Note

QC 20200123

Available from: 2020-01-23 Created: 2020-01-23 Last updated: 2020-02-04Bibliographically approved
Aslam, B., Azam, M. A., Amin, Y., Loo, J. & Tenhunen, H. (2019). A high capacity tunable retransmission type frequency coded chipless radio frequency identification system. International Journal of RF and Microwave Computer-Aided Engineering, 29(9), Article ID e21855.
Open this publication in new window or tab >>A high capacity tunable retransmission type frequency coded chipless radio frequency identification system
Show others...
2019 (English)In: International Journal of RF and Microwave Computer-Aided Engineering, ISSN 1096-4290, E-ISSN 1099-047X, Vol. 29, no 9, article id e21855Article in journal (Refereed) Published
Abstract [en]

This article presents a 12-bit frequency coded chipless RFID system in the frequency range of 3 to 6 GHz. The system consists of a fully printable chipless tag and a pair of high-gain reader antennas. The tag also incorporates its own antennas to improve the read range. Information is encoded into frequency spectrum using a multi-resonant circuit. The circuit consists of multiple microstrip U and L-shaped open stub resonators patterned in a unique configuration. The proposed configuration aids in capturing more data in a reduced space as well as tunable frequency operation. Tag and reader antennas utilize techniques such as stepped impedance feeding line, defective partial ground plane, and stair-step patch structure to achieve wide-band impedance bandwidth in miniature size. The results of the wireless measurements in the non-anechoic environment show that the proposed system has a reading range of more than 20 cm. The presented system possesses great potential for low-cost short-range inventory tracking.

Place, publisher, year, edition, pages
WILEY, 2019
Keywords
frequency coded, multi-resonant circuit, orthogonally polarized antennas
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-257542 (URN)10.1002/mmce.21855 (DOI)000478622300028 ()2-s2.0-85066137117 (Scopus ID)
Note

QC 20190924

Available from: 2019-09-24 Created: 2019-09-24 Last updated: 2019-09-24Bibliographically approved
Aslam, B., Kashif, M., Azam, M. A., Amin, Y., Loo, J. & Tenhunen, H. (2019). A low profile miniature RFID tag antenna dedicated to IoT applications. Electromagnetics, 39(6), 393-406
Open this publication in new window or tab >>A low profile miniature RFID tag antenna dedicated to IoT applications
Show others...
2019 (English)In: Electromagnetics, ISSN 0272-6343, E-ISSN 1532-527X, Vol. 39, no 6, p. 393-406Article in journal (Refereed) Published
Abstract [en]

RFID tag antennas with stable performance on the diverse electromagnetic mounting platforms are an integral part of the ubiquitous RFID systems. This research article presents a novel tag antenna design that facilitates the said objective. The proposed antenna consists of a modified H-shaped slot structure that ensures considerable robustness from the application environment through confining the surface current density within the antenna structure. The antenna offers a tunable bandwidth of 40 MHz within the microwave band of (2.4-2.5) GHz. The proposed tag antenna exhibits excellent response on metallic platforms of different sizes and thicknesses with an effective gain of almost four times of that in free space. Furthermore, the designed tag antenna performs adequately well on low-medium permittivity dielectrics (glass, paper, and plastic) and RF absorbers (water). The free space and on-metal performance of the proposed tag antenna are verified by testing a prototype realized on the FR4 substrate.

Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
Microwave band, internet of things (IoT), slotted patch, and impedance tuning
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-255555 (URN)10.1080/02726343.2019.1641654 (DOI)000476256100001 ()2-s2.0-85070852350 (Scopus ID)
Note

QC 20190814. QC 20191016

Available from: 2019-08-14 Created: 2019-08-14 Last updated: 2019-10-16Bibliographically approved
Khan, T., Rahman, M., Akram, A., Amin, Y. & Tenhunen, H. (2019). A Low-Cost CPW-Fed Multiband Frequency Reconfigurable Antenna for Wireless Applications. ELECTRONICS, 8(8), Article ID 900.
Open this publication in new window or tab >>A Low-Cost CPW-Fed Multiband Frequency Reconfigurable Antenna for Wireless Applications
Show others...
2019 (English)In: ELECTRONICS, ISSN 2079-9292, Vol. 8, no 8, article id 900Article in journal (Refereed) Published
Abstract [en]

A novel, cedar-shaped, coplanar waveguide-fed frequency reconfigurable antenna is proposed. The presented antenna uses low-cost FR4 substrate with a thickness of 1.6 mm. Four PIN diodes are inserted on the antenna surface to variate the current distribution and alter the resonant frequencies with different combinations of switches. The proposed antenna is fabricated and measured for all states, and a good agreement is seen between measured and simulated results. This antenna resonates within the range of 2 GHz to 10 GHz, covering the major wireless applications of aviation service, wireless local area network (WLAN), worldwide interoperability for microwave access (WiMAX), long distance radio telecommunications, and X-band satellite communication. The proposed antenna works resourcefully with reasonable gain, significant bandwidth, directivity, and reflection coefficient. The proposed multiband reconfigurable antenna will pave the way for future wireless communications including WLAN, WiMAX, and possibly fifth-generation (5G) communication.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
reconfigurable antennas, PIN diodes, wireless applications, fifth-generation (5G) communication
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-260200 (URN)10.3390/electronics8080900 (DOI)000483554300028 ()2-s2.0-85071854428 (Scopus ID)
Note

QC 20190930

Available from: 2019-09-30 Created: 2019-09-30 Last updated: 2019-09-30Bibliographically approved
Tariq, N., Riaz, M. A., Shahid, H., Khan, M. J., Amin, Y. & Tenhunen, H. (2019). A Novel Kite-Shaped Chipless RFID Tag for Low-Profile Applications. IETE Journal of Research
Open this publication in new window or tab >>A Novel Kite-Shaped Chipless RFID Tag for Low-Profile Applications
Show others...
2019 (English)In: IETE Journal of ResearchArticle in journal (Refereed) Published
Abstract [en]

n this paper a novel, compact 10-bit chipless radio frequency identification (RFID) tag with stable readable characteristics is proposed. The tag is composed of several concentric novel kite-shaped loop resonators. The desired data sequence is obtained by the insertion or removal of nested elements, offering a 1:1 data bit to resonance correspondence. Each data sequence is encoded in the spectral domain of the tag. The proposed tag shows operability at different polarizations and incident angles of the impinging electromagnetic waves. Operating within the ultra-wideband (UWB), the tag is realized on the Roger RT/duroid® 5880 substrate having physical dimensions of 13.55 × 13.55 mm2. The measurement results of the design reveal a high code density and spectral efficiency of 5.44 bits/cm2 and 2 bits/GHz, respectively. The compact and robust passive chipless RFID tag having scalable data storage potential can be deployed in numerous low-profile applications such as those of wearable and healthcare.

Keywords
Chipless tag, radio frequency identification, radar cross section, frequency signature, backscattering
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-268296 (URN)10.1080/03772063.2019.1691061 (DOI)2-s2.0-85075344951 (Scopus ID)
Note

QC 20200313

Available from: 2020-03-13 Created: 2020-03-13 Last updated: 2020-03-13Bibliographically approved
Naqvi, S. I., Khan, A., Azam, M. A., Amin, Y., Loo, J. & Tenhunen, H. (2019). A planar flexible quad-band antenna for WLAN/WiMAX/LTE applications. In: 2019 2nd International Conference on Computing, Mathematics and Engineering Technologies, iCoMET 2019: . Paper presented at 2nd International Conference on Computing, Mathematics and Engineering Technologies, iCoMET 2019, 30 January 2019 through 31 January 2019. Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>A planar flexible quad-band antenna for WLAN/WiMAX/LTE applications
Show others...
2019 (English)In: 2019 2nd International Conference on Computing, Mathematics and Engineering Technologies, iCoMET 2019, Institute of Electrical and Electronics Engineers Inc. , 2019Conference paper, Published paper (Refereed)
Abstract [en]

In this work a quad-band, planar, low-profile and compact antenna envisioned for incorporation into portable wireless devices is presented. The antenna is modeled on flexible Rogers RT/Duroid 5880 substrate of 0.127mm thickness. The proposed antenna structure consists of symmetrically placed F-shaped slits and a curved rectangular shaped ground plane with a CPW feed line. The four bands obtained for the radiator operates at the resonant frequencies 2.8, 3.9, 5.45 and 6.2 GHz with impedance bandwidths of 14%, 14.5%, 5.7%, and 5% respectively. Thus the proposed antenna supports WLAN, LTE, WiMAX, and C-band applications. The peak gain achieved for the antenna is 3.4 dB.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
Keywords
C-Band, Flexible substrate, Quad-band antenna, WiMAX, Antenna feeders, Antenna grounds, Electric impedance, Mobile antennas, Natural frequencies, Slot antennas, Wireless local area networks (WLAN), Antenna structures, C-bands, Compact antenna, Impedance bandwidths, Portable wireless device, Quad-band antennas, Rectangular-shaped, Microwave antennas
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-255974 (URN)10.1109/ICOMET.2019.8673414 (DOI)2-s2.0-85064117327 (Scopus ID)9781538695098 (ISBN)
Conference
2nd International Conference on Computing, Mathematics and Engineering Technologies, iCoMET 2019, 30 January 2019 through 31 January 2019
Note

QC 20190815

Available from: 2019-08-15 Created: 2019-08-15 Last updated: 2019-08-15Bibliographically approved
Sarker, V. K., Queralta, J. P., Gia, T. N., Tenhunen, H. & Westerlund, T. (2019). A Survey on LoRa for IoT: Integrating Edge Computing. In: 2019 4th International Conference on Fog and Mobile Edge Computing, FMEC 2019: . Paper presented at 4th International Conference on Fog and Mobile Edge Computing, FMEC 2019; Rome; Italy; 10 June 2019 through 13 June 2019 (pp. 295-300). Institute of Electrical and Electronics Engineers (IEEE), Article ID 8795313.
Open this publication in new window or tab >>A Survey on LoRa for IoT: Integrating Edge Computing
Show others...
2019 (English)In: 2019 4th International Conference on Fog and Mobile Edge Computing, FMEC 2019, Institute of Electrical and Electronics Engineers (IEEE), 2019, p. 295-300, article id 8795313Conference paper, Published paper (Refereed)
Abstract [en]

Increased automation and intelligence in computer systems have revealed limitations of Cloud-based computing such as unpredicted latency in safety-critical and performance-sensitive applications. The amount of data generated from ubiquitous sensors has reached a degree where it becomes impractical to always store and process in the Cloud. Edge computing brings computation and storage to the Edge of the network near to where the data originates yielding reduced network load and better performance of services. In parallel, new wireless communication technologies have appeared to facilitate the expansion of Internet of Things (IoT). Instead of seeking higher data rates, low-power wide-area network aims at battery-powered sensor nodes and devices which require reliable communication for a prolonged period of time. Recently, Long Range (LoRa) has become a popular choice for IoT-based solutions. In this paper, we explore and analyze different application fields and related works which use LoRa and investigate potential improvement opportunities and considerations. Furthermore, we propose a generic architecture to integrate Edge computation capability in IoT-based applications for enhanced performance.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2019
Keywords
IoT, Edge Computing, Fog Computing, Smart Cities, Smart Agriculture, Farming, Animal Tracking, IIoT, Smart Metering, LoRa, LoRaWAN, LPWAN, Survey
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-266729 (URN)10.1109/FMEC.2019.8795313 (DOI)000503441300045 ()2-s2.0-85071692087 (Scopus ID)978-1-7281-1796-6 (ISBN)
Conference
4th International Conference on Fog and Mobile Edge Computing, FMEC 2019; Rome; Italy; 10 June 2019 through 13 June 2019
Note

QC 20200117

Available from: 2020-01-17 Created: 2020-01-17 Last updated: 2020-01-17Bibliographically approved
Mohamed, S. A., Haghbayan, M.-H. -., Westerlund, T., Heikkonen, J., Tenhunen, H. & Plosila, J. (2019). A Survey on Odometry for Autonomous Navigation Systems. IEEE Access, 7, 97466-97486, Article ID 8764393.
Open this publication in new window or tab >>A Survey on Odometry for Autonomous Navigation Systems
Show others...
2019 (English)In: IEEE Access, E-ISSN 2169-3536, Vol. 7, p. 97466-97486, article id 8764393Article in journal (Refereed) Published
Abstract [en]

The development of a navigation system is one of the major challenges in building a fully autonomous platform. Full autonomy requires a dependable navigation capability not only in a perfect situation with clear GPS signals but also in situations, where the GPS is unreliable. Therefore, self-contained odometry systems have attracted much attention recently. This paper provides a general and comprehensive overview of the state of the art in the field of self-contained, i.e., GPS denied odometry systems, and identifies the out-coming challenges that demand further research in future. Self-contained odometry methods are categorized into five main types, i.e., wheel, inertial, laser, radar, and visual, where such categorization is based on the type of the sensor data being used for the odometry. Most of the research in the field is focused on analyzing the sensor data exhaustively or partially to extract the vehicle pose. Different combinations and fusions of sensor data in a tightly/loosely coupled manner and with filtering or optimizing fusion method have been investigated. We analyze the advantages and weaknesses of each approach in terms of different evaluation metrics, such as performance, response time, energy efficiency, and accuracy, which can be a useful guideline for researchers and engineers in the field. In the end, some future research challenges in the field are discussed.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
Keywords
filter-based, GPS-denied, inertial odoemtry, laser odometry, loosely-coupled, optimization-based, Self-contained localization, tightly-coupled, visual-inertial odometry, wheel odometry, Energy efficiency, Sensor data fusion, Wheels, Loosely coupled, Odometry, Global positioning system
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-262453 (URN)10.1109/ACCESS.2019.2929133 (DOI)000478965200007 ()2-s2.0-85070312744 (Scopus ID)
Note

QC 20191018

Available from: 2019-10-18 Created: 2019-10-18 Last updated: 2019-10-18Bibliographically approved
Organisations

Search in DiVA

Show all publications