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A UWB bandpass filter with a notched band using dual stepped‐impedance stub‐loaded resonators
Author(s) -
Oh Sangyeol,
Shin Beomsoo,
Jeong Jichai,
Lee Jaehoon
Publication year - 2014
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.28443
Subject(s) - passband , band pass filter , stub (electronics) , resonator , multi band device , acoustics , microwave , electrical impedance , electronic engineering , return loss , bandwidth (computing) , materials science , electrical engineering , optoelectronics , physics , engineering , telecommunications , antenna (radio)
In this article, a new notched‐band ultra‐wide bandpass filter (BPF) is proposed, using dual stepped‐impedance stub‐loaded resonators (SISLRs), open‐circuited stubs, and stepped‐impedance ports (SIPs). As dual SISLRs overlay the frequency responses of the two resonators, the in‐band performance of dual SISLRs is better than that of a single SISLR under the same external coupling. Open‐circuited stubs of length λ /4 were placed between dual SISLRs to reject the wireless LAN interference signal band at 5.8 GHz. In addition, we combined SIPs with dual SISLRs for improved passband performance at high frequencies. The proposed filter was validated via simulation and measurement. The measured return loss of the BPF was less than −10 dB throughout the passband of 3.2–11.01 GHz. The group delay remained relatively flat and less than 0.5 ns throughout this passband, except in the notched band. The rejection bandwidth was 5.73–6.31 GHz. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1785–1787, 2014