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Broadband bandpass filter using parallel‐coupled microstrip line and coupled open stub resonator
Author(s) -
Marimuthu Jayaseelan,
Abbosh Amin,
Henin Bassem
Publication year - 2013
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.27637
Subject(s) - band pass filter , stub (electronics) , broadband , microstrip , resonator , bandwidth (computing) , electronic engineering , cutoff frequency , microwave , waveguide filter , transmission line , optoelectronics , electrical engineering , physics , materials science , acoustics , engineering , telecommunications , prototype filter , optics , low pass filter
A novel broadband bandpass filter with multiple resonant modes based on parallel‐coupled microstrip line is proposed. The required cutoff frequency and out‐of‐band performance are achieved by placing L‐shaped capacitive cross‐coupling open stubs at the middle resonator with appropriate dimensions. A compact broadband bandpass filter of dimensions 18 × 29 mm 2 is fabricated and tested for performance confirmation. The proposed filter demonstrates a wide bandwidth (from 3 to 7 GHz), as well as excellent out‐of‐band performance with more than 25‐dB rejection up to more than 12 GHz and sharp upper cutoff frequency due to the proper location of two transmission zeros. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1640–1644, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27637