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Compact ultra‐wideband bandpass filter with improved out‐of‐band rejection
Author(s) -
Mondal Priyanka,
Kanti Mandal Mrinal,
Chakrabarty Ajay
Publication year - 2008
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.23203
Subject(s) - stopband , passband , microstrip , elliptic filter , band pass filter , band stop filter , filter (signal processing) , butterworth filter , wideband , insertion loss , microwave , transition band , electronic filter topology , electronic engineering , materials science , resonator , electrical engineering , physics , optoelectronics , engineering , prototype filter , telecommunications , low pass filter
This letter presents a compact ultra‐wideband bandpass filter with improved out‐of‐band rejection performances. Complementary split ring resonators with microstrip feed lines are used to design the filter. Measurements show that maximum insertion loss within the ultra‐wide passband is below 2 dB. The 50‐dB stopband on the lower end is from DC to 2.48 GHz and the 25‐dB upper stopband is from 11.27 to 20 GHz. Out‐of‐band rejection performance of the filter satisfies and exceeds the U.S. Federal Communications Commission's indoor limit. Implementation area of the filter is 0.54 λ g × 0.22 λ g , λ g is the guided wavelength of 50‐Ω microstrip line at 6.85 GHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 758–761, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23203