• DocumentCode
    268931
  • Title

    Extended-stopband microstrip lowpass filter using rat-race directional couplers

  • Author

    Gómez-García, Roberto ; Sánchez-Soriano, M.-A. ; Sánchez-Renedo, M. ; Torregrosa-Penalva, German ; Bronchalo, Enrique

  • Author_Institution
    Signal Theory & Commun. Dept., Univ. of Alcalá, Madrid, Spain
  • Volume
    49
  • Issue
    4
  • fYear
    2013
  • fDate
    Feb. 14 2013
  • Firstpage
    272
  • Lastpage
    274
  • Abstract
    A class of microstrip lowpass filter (LPF) with a sharp-rejection, ultra-broad stopband is reported. It employs rat-race directional couplers properly arranged to operate as bandstop transversal filtering sections (TFSs). The theoretical foundations of this LPF approach are described, and the performance control of its building bandstop TFS is verified. Moreover, a proof-of-concept microstrip LPF prototype with a 3 dB cutoff frequency of 1 GHz and a 20 dB stopband up to 5.86 GHz has been built and tested.
  • Keywords
    band-stop filters; low-pass filters; microstrip directional couplers; microstrip filters; transversal filters; LPF approach; bandstop TFS; bandstop transversal filtering section; extended-stopband microstrip lowpass filter; gain 20 dB; gain 3 dB; performance control; rat-race directional coupler; sharp-rejection ultrabroad stopband filter;
  • fLanguage
    English
  • Journal_Title
    Electronics Letters
  • Publisher
    iet
  • ISSN
    0013-5194
  • Type

    jour

  • DOI
    10.1049/el.2012.4245
  • Filename
    6464682
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=268931