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Design of dual wideband bandpass filter using stub loaded multi‐mode resonators
Author(s) -
Turkeli Alper,
Gorur Ali Kursad,
Sahin Elif Gunturkun,
Gorur Adnan
Publication year - 2018
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.31393
Subject(s) - passband , band pass filter , stub (electronics) , resonator , wideband , insertion loss , acoustics , electronic engineering , microstrip , return loss , materials science , prototype filter , physics , filter (signal processing) , optics , engineering , telecommunications , electrical engineering , filter design , antenna (radio)
Abstract In this paper, a novel dual wideband microstrip bandpass filter is proposed. The designed filter is constructed by two different stub loaded resonators located at the upper and bottom sides of the coupling line. The coupling transmission line is also connected to input and output (IO) ports. The upper resonator creates a wide passband, whereas the bottom resonator is used to create two transmission zeros in the passband. Thus, a wide passband can be divided into dual wide passbands. The bottom resonator is also utilized to improve the insertion and return losses in the passband. The designed filter is fabricated and tested in a very good agreement with the simulated results. The measured fractional bandwidths (FBWs) of the passbands are 44.6% and 24.2% at the center frequencies of 3.4 GHz and 5.51 GHz, respectively. The measured insertion losses in the passbands are 0.51 dB and 1.13 dB.