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C S Urrus - One of the best experts on this subject based on the ideXlab platform.

  • constrained least square design of fir Filters without specified transition bands
    IEEE Transactions on Signal Processing, 1996
    Co-Authors: Ivan W Selesnick, M Lang, C S Urrus
    Abstract:

    This paper puts forth the notion that explicitly specified transition bands have been introduced in the filter design literature in part as an indirect approach for dealing with discontinuities in the desired frequency response. We suggest that the use of explicitly specified transition bands is sometimes inappropriate because to satisfy a meaningful optimality criterion, their use implicitly assumes a possibly unrealistic assumption on the class of input signals. This paper also presents an algorithm for the design of peak constrained lowpass FIR Filters according to an integral square error criterion that does not require the use of specified transition bands. This rapidly converging, robust, simple multiple exchange algorithm uses Lagrange multipliers and the Kuhn-Tucker conditions on each iteration. The algorithm will design linear- and minimum-phase FIR Filters and gives the best L/sub 2/ filter and a continuum of Chebyshev Filters as special cases. It is distinct from many other filter design methods because it does not exclude from the integral square error a region around the cut-off frequency, and yet, it overcomes the Gibbs' phenomenon without resorting to windowing or 'smoothing out' the discontinuity of the ideal lowpass filter.

  • constrained least square design of fir Filters without specified transition bands
    International Conference on Acoustics Speech and Signal Processing, 1995
    Co-Authors: Ivan W Selesnick, M Lang, C S Urrus
    Abstract:

    We consider the design of digital Filters and discuss the inclusion of explicitly specified transition bands in the frequency domain design of FIR Filters. We put forth the notion that explicitly specified transition bands have been introduced in the filter design literature as an indirect and sometimes inadequate approach for dealing with discontinuities in the desired frequency response. We also present a rapidly converging, robust, simple algorithm for the design of optimal peak constrained least square lowpass FIR Filters that does not require the use of transition bands. This versatile algorithm will design linear and minimum phase FIR Filters and gives the best L/sub 2/ filter and a continuum of Chebyshev Filters as special cases.

Ivan W Selesnick - One of the best experts on this subject based on the ideXlab platform.

  • constrained least square design of fir Filters without specified transition bands
    IEEE Transactions on Signal Processing, 1996
    Co-Authors: Ivan W Selesnick, M Lang, C S Urrus
    Abstract:

    This paper puts forth the notion that explicitly specified transition bands have been introduced in the filter design literature in part as an indirect approach for dealing with discontinuities in the desired frequency response. We suggest that the use of explicitly specified transition bands is sometimes inappropriate because to satisfy a meaningful optimality criterion, their use implicitly assumes a possibly unrealistic assumption on the class of input signals. This paper also presents an algorithm for the design of peak constrained lowpass FIR Filters according to an integral square error criterion that does not require the use of specified transition bands. This rapidly converging, robust, simple multiple exchange algorithm uses Lagrange multipliers and the Kuhn-Tucker conditions on each iteration. The algorithm will design linear- and minimum-phase FIR Filters and gives the best L/sub 2/ filter and a continuum of Chebyshev Filters as special cases. It is distinct from many other filter design methods because it does not exclude from the integral square error a region around the cut-off frequency, and yet, it overcomes the Gibbs' phenomenon without resorting to windowing or 'smoothing out' the discontinuity of the ideal lowpass filter.

  • constrained least square design of fir Filters without specified transition bands
    International Conference on Acoustics Speech and Signal Processing, 1995
    Co-Authors: Ivan W Selesnick, M Lang, C S Urrus
    Abstract:

    We consider the design of digital Filters and discuss the inclusion of explicitly specified transition bands in the frequency domain design of FIR Filters. We put forth the notion that explicitly specified transition bands have been introduced in the filter design literature as an indirect and sometimes inadequate approach for dealing with discontinuities in the desired frequency response. We also present a rapidly converging, robust, simple algorithm for the design of optimal peak constrained least square lowpass FIR Filters that does not require the use of transition bands. This versatile algorithm will design linear and minimum phase FIR Filters and gives the best L/sub 2/ filter and a continuum of Chebyshev Filters as special cases.

M Mrozowski - One of the best experts on this subject based on the ideXlab platform.

  • a novel coupling matrix synthesis technique for generalized Chebyshev Filters with resonant source load connection
    IEEE Transactions on Microwave Theory and Techniques, 2013
    Co-Authors: Lukasz Szydlowski, Adam Lamecki, M Mrozowski
    Abstract:

    This paper reports a novel synthesis method for microwave bandpass Filters with resonant source-load connection. In effect, a network realizing N+1 transmission zeros (where N is the number of reflection zeros) is obtained. The method is based on a prototype transversal coupling matrix (N+2, N+2) with source and load connected by a resonant circuit formed by a capacitor in parallel with a frequency-invariant susceptance. To complement the proposed synthesis technique, a method of reconfiguring the transversal coupling matrix as a more practical cross-coupled circuit is outlined. The technique is based on quickly converging gradient optimization with a cost function involving generalized eigenvalues of the transversal coupling matrix and its principal upper and lower submatrices. To illustrate and validate the proposed synthesis procedure, numerical tests have been carried out. Moreover, some aspects of implementation of the resonant connection between source and load were investigated, and experimental verification was performed. A third-order generalized Chebyshev filter with four transmission zeros was designed, fabricated, and tested. The measured results validate the proposed synthesis method.

  • A Novel Coupling Matrix Synthesis Technique for Generalized Chebyshev Filters With Resonant Source–Load Connection
    IEEE Transactions on Microwave Theory and Techniques, 2013
    Co-Authors: Lukasz Szydlowski, Adam Lamecki, M Mrozowski
    Abstract:

    This paper reports a novel synthesis method for microwave bandpass Filters with resonant source-load connection. In effect, a network realizing N+1 transmission zeros (where N is the number of reflection zeros) is obtained. The method is based on a prototype transversal coupling matrix (N+2, N+2) with source and load connected by a resonant circuit formed by a capacitor in parallel with a frequency-invariant susceptance. To complement the proposed synthesis technique, a method of reconfiguring the transversal coupling matrix as a more practical cross-coupled circuit is outlined. The technique is based on quickly converging gradient optimization with a cost function involving generalized eigenvalues of the transversal coupling matrix and its principal upper and lower submatrices. To illustrate and validate the proposed synthesis procedure, numerical tests have been carried out. Moreover, some aspects of implementation of the resonant connection between source and load were investigated, and experimental verification was performed. A third-order generalized Chebyshev filter with four transmission zeros was designed, fabricated, and tested. The measured results validate the proposed synthesis method.

M Lang - One of the best experts on this subject based on the ideXlab platform.

  • constrained least square design of fir Filters without specified transition bands
    IEEE Transactions on Signal Processing, 1996
    Co-Authors: Ivan W Selesnick, M Lang, C S Urrus
    Abstract:

    This paper puts forth the notion that explicitly specified transition bands have been introduced in the filter design literature in part as an indirect approach for dealing with discontinuities in the desired frequency response. We suggest that the use of explicitly specified transition bands is sometimes inappropriate because to satisfy a meaningful optimality criterion, their use implicitly assumes a possibly unrealistic assumption on the class of input signals. This paper also presents an algorithm for the design of peak constrained lowpass FIR Filters according to an integral square error criterion that does not require the use of specified transition bands. This rapidly converging, robust, simple multiple exchange algorithm uses Lagrange multipliers and the Kuhn-Tucker conditions on each iteration. The algorithm will design linear- and minimum-phase FIR Filters and gives the best L/sub 2/ filter and a continuum of Chebyshev Filters as special cases. It is distinct from many other filter design methods because it does not exclude from the integral square error a region around the cut-off frequency, and yet, it overcomes the Gibbs' phenomenon without resorting to windowing or 'smoothing out' the discontinuity of the ideal lowpass filter.

  • constrained least square design of fir Filters without specified transition bands
    International Conference on Acoustics Speech and Signal Processing, 1995
    Co-Authors: Ivan W Selesnick, M Lang, C S Urrus
    Abstract:

    We consider the design of digital Filters and discuss the inclusion of explicitly specified transition bands in the frequency domain design of FIR Filters. We put forth the notion that explicitly specified transition bands have been introduced in the filter design literature as an indirect and sometimes inadequate approach for dealing with discontinuities in the desired frequency response. We also present a rapidly converging, robust, simple algorithm for the design of optimal peak constrained least square lowpass FIR Filters that does not require the use of transition bands. This versatile algorithm will design linear and minimum phase FIR Filters and gives the best L/sub 2/ filter and a continuum of Chebyshev Filters as special cases.

Jentsai Kuo - One of the best experts on this subject based on the ideXlab platform.

  • new synthesis of parallel coupled line bandpass Filters with Chebyshev responses
    IEEE Transactions on Microwave Theory and Techniques, 2008
    Co-Authors: Kuosheng Chin, Yichyun Chiou, Jentsai Kuo
    Abstract:

    Parallel-coupled line Filters with Chebyshev passbands are synthesized based on the insertion-loss functions derived by converting the composite ABCD matrices of all coupled stages. With the synthesis, both the electromagnetic simulation and measurement results have accurate in-band response and bandwidth. Simultaneous equations for Chebyshev Filters of order N les 9 are derived for determining geometric parameters of the coupled stages. The tradeoff between circuit bandwidth and ripple level is discussed. In experiments, three planar or quasi-planar structures, including the coupled-line with aperture in the ground plane, the three-line microstrip, and the broadside-coupled lines, are employed to realize the end stages for implementing the high coupling levels. Experimental Filters of order up to nine with fractional bandwidth of 30% or 40% are fabricated and measured. The results show good agreement with predictions by the theory and simulation.

  • broadband quasi Chebyshev bandpass Filters with multimode stepped impedance resonators sirs
    IEEE Transactions on Microwave Theory and Techniques, 2006
    Co-Authors: Yichyun Chiou, Jentsai Kuo, Eisenhower Cheng
    Abstract:

    Planar broadband bandpass Filters of order up to 9 are synthesized based on the multimode property of stepped-impedance resonators (SIRs). Based on the transmission line theory, the modal frequencies of the SIRs are calculated based on the impedance and length ratios of its hi- and low-Z segments. In the synthesis, the SIR coupling schemes are determined by the split mode graphs. Using one, two, two, three, and three dual- or triple-mode SIRs, quasi-Chebyshev Filters with four, six, six, eight, and nine transmission poles, respectively, are synthesized with a fractional bandwidth (BW) Delta=50%. Emphasis is placed not only on designing the I/O coupling structures for matching the external Q (Qext) and the circuit BW, but also on matching the resonant peaks of the circuit with the nominal Chebyshev poles. Measured results of experimental circuits show good agreement with simulated responses