Now showing items 1-7 of 7

  • Construction of Lossless Ladder Networks With Simple Lumped Elements Connected Via Commensurate Transmission Lines 

    In this work an algorithm to design lossless ladder networks with simple lumped elements connected via commensurate transmission lines is proposed. After giving the algorithm a lumped-element low-pass Chebyshev filter was transformed to its mixed-element counterpart to illustrate the utilization of the algorithm. The filter designed for a frequency band around 1 GHz was fabricated and experimentally characterized. We find very good agreement between measured and simulated transducer power gain ...

  • Design of distributed-element RF filters via reflectance data modeling 

    A reflectance-based modeling method is presented to obtain the distributed-element counterpart of a lumped-element network which is described by measured or computed reflectance data at a set of frequencies. Numerical generation of the scattering parameters forms the basis of this modeling tool. It is not necessary to select a circuit topology for the distributed-element model which is the natural consequence of the modeling process. Our approach supplements the known interpolation methods by a ...

  • Design table formation of stepped impedance prototype filters 

    Authors:Şengül, Metin Y.
    Publisher and Date:(Istanbul University, 2010)
    In literature there exist some tables containing normalized element values to design low-pass lumped-element prototype filters with several different responses like maximally flat or equal-ripple. In this work an algorithm is presented to form such tables for stepped impedance prototype filters. By using the proposed algorithm a table for 0.5 dB equal-ripple stepped impedance prototype filter is formed. Then a design example is given to show the utilization of the formed table.

  • Design table formation of stepped impedance prototype filters 

    Authors:Şengül, Metin Y.
    Publisher and Date:(AVES YAYINCILIK, 2010)
    In literature, there exist some tables containing normalized element values, to design low-pass lumped-element prototype filters with several different responses like maximally flat or equal-ripple. In this work, an algorithm is presented, to form such tables for stepped impedance prototype filters. By using the proposed algorithm, a table for 0.5 dB equal-ripple stepped impedance prototype filter is formed. Then a design example is given, to show the utilization of the formed table.

  • Shifted-modified Chebyshev filters 

    This paper introduces a new type of filter approximation method that utilizes shifted-modified Chebyshev filters. Construction of the new filters involves the use of shifted-modified Chebyshev polynomials that are formed using the roots of conventional Chebyshev polynomials. The study also includes 2 tables containing the shifted-modified Chebyshev polynomials and the normalized element values for the low-pass prototype filters up to degree 6. The transducer power gain group delay and impulse and ...

  • Smart Stethoscope 

    In this study, a device named smart stethoscope that uses digital sensor technology for sound capture, active acoustics for noise cancellation and artificial intelligence (AI) for diagnosis of heart and lung diseases is developed to help the health workers to make accurate diagnoses. Furthermore, the respiratory diseases are classified by using Deep Learning and Long Short-Term Memory (LSTM) techniques whereas the probability of these diseases are obtained.

  • Transitional Butterworth-Chebyshev Filters 

    Authors:Şengül, Metin Y.
    Publisher and Date:(IEEE, 2018)
    Filters which are studied in this paper have properties that lie between those of the Butterworth and Chebyshev filters. So it is appropriate to call this kind of filters as transitional Butterworth-Chebyshev filters. In this work different 6th order transitional filters are designed and their responses are compared with each other.