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Träfflista för sökning "WFRF:(Linnér Peter 1945 ) "

Sökning: WFRF:(Linnér Peter 1945 )

  • Resultat 1-10 av 28
  • [1]23Nästa
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  • Ferndahl, Mattias, 1973-, et al. (författare)
  • A General Statistical Equivalent-Circuit-Based De-Embedding Procedure for High-Frequency Measurements
  • 2008
  • Ingår i: IEEE Transactions on Microwave Theory and Techniques. - 0018-9480. ; 56:12, s. 2692-2700
  • Tidskriftsartikel (refereegranskat)abstract
    • A general equivalent-circuit-based method for the de-embedding of scattering parameters is presented. An equivalent circuit representation is used to model the embedding package. The parameters in the models are estimated with a statistical method using measured data from all de-embedding standards jointly together. Hence, it is possible to assess parameter estimates and their variance and covariance due to measurement uncertainties. A general de-embedding equation, which is valid for any five-port with a defined nodal admittance matrix, is derived and used in the subsequent de-embedding of measured device data. Different equivalent circuit models for the embedding network are then studied, and tradeoffs between model complexity and uncertainty are evaluated. Furthermore, the influence of varying number and combinations of de-embedding standards on the parameter estimates is investigated. The method is verified, using both measured and synthetic data, and compared against previously published work. It is found to be more general while keeping or improving accuracy.
  • Fhager, Andreas, 1976-, et al. (författare)
  • Progress in clinical diagnostics and treatment with electromagnetic fields
  • 2011
  • Ingår i: Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011. Rome, 11-15 April 2011. - 978-888202074-3 ; s. 1936-1937
  • Konferensbidrag (refereegranskat)abstract
    • There is a need for novel diagnostic and treatment systems to overcome the limitations with todays modalities. Microwave and THz based system has the potential to become both sensitive and specific in several applications. In this paper we discuss several applications that are currently being developed at the Chalmers University of Technology.
  • Kuylenstierna, Dan, 1976-, et al. (författare)
  • 2003
  • Ingår i: Gigahertz 2003 Proceedings. - 0780383311
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • This paper reports on a small size broadband lumped element balun suitable for integration in MMICs. The design is an extension of the well known lattice balun, which independent of frequency has 180 degrees phase difference between the output ports, but suffers from a narrow amplitude bandwidth. It is shown how the amplitude bandwidth of the lattice balun may be improved by replacing inductors with low-pass T-sections, and the capacitors with high-pass T-sections. Scalable closed-form design equations for various bandwidths are derived. To validate the concept a prototype operating at 1 GHz has been fabricated with SMT chip components soldered on a PTFE laminate. It exhibits amplitude balance better than +or-0.25 dB and phase balance better than +or-8 degrees , over more than one octave bandwidth. The effective chip-area is 7*9 mm/sup 2/
  • Kuylenstierna, Dan, 1976-, et al. (författare)
  • Design of broad-band lumped-element baluns with inherent impedance transformation
  • 2004
  • Ingår i: IEEE Transactions on Microwave Theory and Techniques. - 0018-9480. ; 52:12, s. 2739-45
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper reports on a novel lumped balun topology, the second-order lattice balun, with broad-band performance. The design is based on synthetic transmission lines operating as impedance transformers. The characteristic impedance of the synthetic transmission lines may be chosen to obtain inherent impedance transformation. An analytical investigation results in closed formulas for optimum performance over a given bandwidth. It is shown that it is possible to design for equal ripple in amplitude balance and input reflection coefficient. The phase balance is theoretically perfect over the entire bandwidth. The concept is experimentally validated by a 1-GHz prototype fabricated with surface mounted chip components. It exhibits an amplitude balance better than 0.5 dB and a phase balance better than +or-8 degrees over an octave bandwidth. The effective area of the prototype is 7 * 9 mm/sup 2/
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