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Publications (7 of 7) Show all publications
Kluss, J., Elg, A. P. & Wingqvist, C. (2021). High-Frequency Current Transformer Design and Implementation Considerations for Wideband Partial Discharge Applications. IEEE Transactions on Instrumentation and Measurement, 70, Article ID 6003809.
Open this publication in new window or tab >>High-Frequency Current Transformer Design and Implementation Considerations for Wideband Partial Discharge Applications
2021 (English)In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 70, article id 6003809Article in journal (Refereed) Published
Abstract [en]

High-frequency current transformers are popular noninvasive inductive wideband sensors. Despite simplicity in design and operational principle, implementation of such sensors for partial discharge applications requires careful consideration, particularly in the higher frequency range where traveling wave attenuation and distortion is relevant. First, the role of design variables, including core materials, winding design, and shielding practices on sensor sensitivity and frequency characteristics (transfer impedance) are presented. Next, the suitability of the constructed sensors for partial discharge applications is assessed. The designed wideband sensors are suitable for laboratory applications with standard measurement circuits and controlled conditions. The low-level magnitude and frequency spectrum of the discharge pulses hinders signal integrity in relation to the placement of the sensors within the measurement circuit, signal amplification, and pulse repetition rate (pulse resolution). To enable most stringent detection levels under 1 pC, efforts are needed in distortionless amplifier design and interference mitigation. 

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2021
Keywords
Apertures, Current measurement, current transformers, frequency-domain analysis, high-voltage techniques, partial discharge measurement, Partial discharges, Sensitivity, time-domain analysis, Voltage measurement, Wideband
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-52227 (URN)10.1109/TIM.2021.3052002 (DOI)2-s2.0-85099723741 (Scopus ID)
Available from: 2021-02-05 Created: 2021-02-05 Last updated: 2023-05-23Bibliographically approved
Yhland, K., Judaschke, R. H., Rausche, F., Wingqvist, C. & Stenarson, J. (2012). Bilateral comparison on calibration factor of a 2.92 mm power sensor (ed.). In: : . Paper presented at CPEM Digest (Conference on Precision Electromagnetic Measurements) CPEM 2012; Washington, DC; United States; 1-6 July, 2012 (pp. 86-87). , Article ID 6250673.
Open this publication in new window or tab >>Bilateral comparison on calibration factor of a 2.92 mm power sensor
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2012 (English)Conference paper, Published paper (Refereed)
Abstract [en]

This paper describes a bilateral comparison between PTB and SP on the calibration factor of a 2.92 mm thermocouple power sensor. The measurements were done at 0 dBm from 50 MHz to 40 GHz. The comparison also covers the sensor reflection coefficient over the same frequency range.

Publisher
p. 86-87
Keywords
2.92 mmcalibration factor, Measurement comparison, measurement uncertainty, microwave, power sensor, reflection coefficient
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-12505 (URN)10.1109/CPEM.2012.6250673 (DOI)2-s2.0-84866793756 (Scopus ID)23911 (Local ID)23911 (Archive number)23911 (OAI)
Conference
CPEM Digest (Conference on Precision Electromagnetic Measurements) CPEM 2012; Washington, DC; United States; 1-6 July, 2012
Available from: 2016-09-13 Created: 2016-09-13 Last updated: 2021-06-17Bibliographically approved
Hallbjörner, P., Ying, Z., Håkansson, M., Wingqvist, C., Anttila, T. & Welinder, J. (2012). Multipath Simulator for Mobile Terminal Antenna Characterisation (ed.). In: IET Microwaves, Antennas and Propagation: . Paper presented at IET Microwaves, Antennas and Propagation.
Open this publication in new window or tab >>Multipath Simulator for Mobile Terminal Antenna Characterisation
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2012 (English)In: IET Microwaves, Antennas and Propagation, 2012, , p. 743-750Conference paper, Published paper (Other academic)
Publisher
p. 743-750
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-12240 (URN)14740 (Local ID)14740 (Archive number)14740 (OAI)
Conference
IET Microwaves, Antennas and Propagation
Available from: 2016-09-13 Created: 2016-09-13 Last updated: 2021-06-17Bibliographically approved
Ebenhag, S.-C., Wingqvist, C. & Hedekvist, P. O. (2012). Real-time phase stable one-way frequency transfer over optical fiber (ed.). In: EFTF 2012 - European Frequency and Time Forum, Proceedings: . Paper presented at EFTF 2012 - European Frequency and Time Forum. Gothenburg; Sweden; 23-27 April 2012 (pp. 206-210). , Article ID 6502368.
Open this publication in new window or tab >>Real-time phase stable one-way frequency transfer over optical fiber
2012 (English)In: EFTF 2012 - European Frequency and Time Forum, Proceedings, 2012, , p. 206-210p. 206-210, article id 6502368Conference paper, Published paper (Refereed)
Abstract [en]

The fundamental and most straightforward method for high performance time and frequency transfer is the two-way technique, which is suitable when the user has access to the whole system, and when both transmission paths are equal or with a known and predictable asymmetry. Furthermore it is most practical when the numbers of users are limited and when no security concerns limit the bidirectional connectivity.

Publisher
p. 206-210
Keywords
Frequency transfer, Phase stable, Straight-forward method, Time and frequency transfers, Transmission paths
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-12535 (URN)10.1109/EFTF.2012.6502368 (DOI)2-s2.0-84877595355 (Scopus ID)23980 (Local ID)23980 (Archive number)23980 (OAI)
Conference
EFTF 2012 - European Frequency and Time Forum. Gothenburg; Sweden; 23-27 April 2012
Available from: 2016-09-13 Created: 2016-09-13 Last updated: 2023-06-08Bibliographically approved
Stenarson, J., Yhland, K. & Wingqvist, C. (2001). An in-circuit, non-contacting, measurement method for S-parameters and power in planar circuits (ed.). IEEE transactions on microwave theory and techniques, 49(12), 2567-2572
Open this publication in new window or tab >>An in-circuit, non-contacting, measurement method for S-parameters and power in planar circuits
2001 (English)In: IEEE transactions on microwave theory and techniques, Vol. 49, no 12, p. 2567-2572Article in journal (Refereed) Published
Abstract [en]

A method for measuring the reflection coefficient and absolute power in the propagating waves from a circuit embedded in a planar circuit environment is presented. The method utilizes a pair of inductive and capacitive probes. The standard one-port vector-network-analyzer calibration is extended to allow the measurement of power in the forward and backward waves. Experimental results are presented for measurements between 700 MHz and 20 GHz. Good agreement between the new noncontacting method and a standard coaxial measurement method is demonstrated up to 12 GHz for power and up to 14 GHz for the reflection coefficient. The method is useful for in-circuit testing of open transmission-line structures, e.g., microstrip.

National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-5789 (URN)1834 (Local ID)1834 (Archive number)1834 (OAI)
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2021-06-17Bibliographically approved
Stenarson, J., Yhland, K. & Wingqvist, C. (2001). An in-circuit, non-contacting, S-para-meter measurement method, (ed.). In: Proceedings of 57th ARFTG Conference, 2001.: . Paper presented at 57th ARFTG Conference, 2001..
Open this publication in new window or tab >>An in-circuit, non-contacting, S-para-meter measurement method,
2001 (English)In: Proceedings of 57th ARFTG Conference, 2001., 2001Conference paper, Published paper (Refereed)
Abstract [en]

A method for measuring S-parameters of a circuit embedded in a planar circuit environment is presented. The method utilizes an inductive and a capacitive probe. Experimental results are presented for probe measurements of reflection coefficient from 0.7 to 20 GHz with good agreement to verifying measurements up to 14 GHz. The method shows great promise for in-circuit Sparameter testing that has previously required physical modification or even complete disassembly to test sub-circuits in a microstrip environment.

National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-11403 (URN)1833 (Local ID)1833 (Archive number)1833 (OAI)
Conference
57th ARFTG Conference, 2001.
Available from: 2016-09-13 Created: 2016-09-13 Last updated: 2021-06-17Bibliographically approved
Yhland, K., Stenarson, J. & Wingqvist, C. (2001). An in-circuit, non-contacting, S-para-meter measurement method (ed.). In: Proceedings of Swedish National Symposium on Gi-gahertz Electronics, 2001: . Paper presented at Swedish National Symposium on Gi-gahertz Electronics, 2001.
Open this publication in new window or tab >>An in-circuit, non-contacting, S-para-meter measurement method
2001 (English)In: Proceedings of Swedish National Symposium on Gi-gahertz Electronics, 2001, 2001Conference paper, Published paper (Other academic)
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-11404 (URN)1835 (Local ID)1835 (Archive number)1835 (OAI)
Conference
Swedish National Symposium on Gi-gahertz Electronics, 2001
Available from: 2016-09-13 Created: 2016-09-13 Last updated: 2021-06-17Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1164-8254

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