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  • 1.
    Ebenhag, Sven-Christian
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation. Chalmers University of Technology, Sweden.
    Wingqvist, Claes
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Hedekvist, Per Olof
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation. Chalmers University of Technology, Sweden.
    Real-time phase stable one-way frequency transfer over optical fiber2012In: EFTF 2012 - European Frequency and Time Forum, Proceedings, 2012, , p. 206-210p. 206-210, article id 6502368Conference 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.

  • 2.
    Hallbjörner, Paul
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, EMC.
    Ying, Zhinong
    Håkansson, M
    Wingqvist, Claes
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Anttila, Tommi
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, EMC.
    Welinder, Jan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, EMC.
    Multipath Simulator for Mobile Terminal Antenna Characterisation2012In: IET Microwaves, Antennas and Propagation, 2012, , p. 743-750Conference paper (Other academic)
  • 3.
    Kluss, Joni
    et al.
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Elg, Alf Peter
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Wingqvist, Claes
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    High-Frequency Current Transformer Design and Implementation Considerations for Wideband Partial Discharge Applications2021In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 70, article id 6003809Article in journal (Refereed)
    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. 

  • 4.
    Stenarson, Jörgen
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Yhland, Klas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Wingqvist, Claes
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    An in-circuit, non-contacting, measurement method for S-parameters and power in planar circuits2001In: IEEE transactions on microwave theory and techniques, Vol. 49, no 12, p. 2567-2572Article in journal (Refereed)
    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.

  • 5.
    Stenarson, Jörgen
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Yhland, Klas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Wingqvist, Claes
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    An in-circuit, non-contacting, S-para-meter measurement method,2001In: Proceedings of 57th ARFTG Conference, 2001., 2001Conference 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.

  • 6.
    Yhland, Klas
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Judaschke, Rolf H.
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Rausche, Florian
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Wingqvist, Claes
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Stenarson, Jörgen
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Bilateral comparison on calibration factor of a 2.92 mm power sensor2012Conference 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.

  • 7.
    Yhland, Klas
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Stenarson, Jörgen
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Wingqvist, Claes
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    An in-circuit, non-contacting, S-para-meter measurement method2001In: Proceedings of Swedish National Symposium on Gi-gahertz Electronics, 2001, 2001Conference paper (Other academic)
1 - 7 of 7
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