Extended‐stopband microstrip lowpass filter using rat‐race directional couplers | Zendy

GómezGarcía R. | Zendy; SánchezSoriano M.A. | Zendy; SánchezRenedo M. | Zendy; TorregrosaPenalva G. | Zendy; Bronchalo E. | Zendy

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

Author(s) -

GómezGarcía R.,

SánchezSoriano M.A.,

SánchezRenedo M.,

TorregrosaPenalva G.,

Bronchalo E.

Publication year - 2013

Publication title -

electronics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.375

H-Index - 146

eISSN - 1350-911X

pISSN - 0013-5194

DOI - 10.1049/el.2012.4245

Subject(s) - stopband , microstrip , low pass filter , electronic engineering , filter (signal processing) , elliptic filter , chebyshev filter , band pass filter , prototype filter , computer science , topology (electrical circuits) , acoustics , physics , engineering , electrical engineering

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.

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