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A novel tri‐band filter using stub‐loaded open loop ring resonators
Author(s) -
Lai Xin,
Wu Bian,
Su Tao,
Liang ChangHong
Publication year - 2010
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.24971
Subject(s) - stub (electronics) , passband , resonator , microstrip , microwave , electronic engineering , optoelectronics , band pass filter , materials science , electrical engineering , engineering , physics , acoustics , topology (electrical circuits) , telecommunications
In this article, a novel type of compact tri‐band filter using stub‐loaded open‐loop ring resonators (OLRRs) is presented.With the open stub loaded, the resonant frequency of the OLRR can be tuned by the tapped location and length of the loaded stub, which makes the OLRR more compact. Making use of the microstrip open‐ended feed line, proper external couplings are provided to each passband by magnetic coupling. A tri‐band filter centered at 2.0 GHz, 3.2 GHz, and 4.3 GHz is designed, fabricated and measured. Predicted results are verified by the experiments. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 523–526, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24971