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2005 - 20062
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Yazar: Şengül, Metin × Konu: Circuits ×

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  • Küçük Resim
    Yayın
    Circuit model for given reflectance data constructed with mixed lumped and distributed elements for high speed/high frequency communication systems
    (IEEE, 2005) Yarman, Bekir Sıddık Binboğa; Şengül, Metin; Kılınç, Ali; Aksen, Ahmet
    In this paper, a reflectance-based "non linear interpolation method" is presented to model the measured or computed data, obtained from a "passive one-port physical device" using mixed lumped and distributed elements. Mixed element model is constructed with cascade connection of series inductors [L], commensurate transmission lines or so called Unit Elements [UE] and shunt capacitors[C]. Basis of the new model rests on the numerical generation of the scattering parameters of the lossless two-port constructed with cascade connection of simple [L]-[UE]-[C] elements which describes a lossless 2-port in Darlington sense. The new modeling technique does not require direct optimization of the circuit elements of the selected topology. Rather, two-variable reflection coefficient is directly determined by means of a non linear but "convergence guaranteed" interpolation process to best fit the given data. A low-pass filter input reflection coefficient modeling example is included to exhibit the utilization of the proposed modeling method.
  • Küçük Resim
    Yayın
    Circuit models with mixed lumped and distributed elements for passive one-port devices
    (Işık Üniversitesi, 2006-01-23) Şengül, Metin; Aksen, Ahmet; Yarman, Bekir Sıddık Binboğa; Işık Üniversitesi, Fen Bilimleri Enstitüsü, Elektronik Mühendisliği Doktora Programı
    In this thesis, to model measured data obtained from an actual passive one-port device, a circuit modeling method with mixed lumped and distributed elements is proposed. Namely, measured data is modelled by means of its Darlington equivalent, in other words, as a lossless two-port terminated with a resistance. Two network topologies are examined. The first topology is ladder networks connected with unit elements and the second one is cascaded separate lumped and distributed networks. In the proposed modeling method, analytic expression of the input reflection coefficient of the two-port model is obtained by using gradient method, and then, after synthesizing this two-variable function, the model is reached. Thus, for the first time in the literature, a two-variable circuit modeling method is presented.