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Balanced wideband BPF design using stub‐loaded multimode resonator for MB‐OFDM application
Author(s) -
Lee ChingHer,
Chang TsungHan,
Hsu ChungI G.,
Chang JhihHong
Publication year - 2012
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.27110
Subject(s) - passband , stub (electronics) , resonator , wideband , band pass filter , insertion loss , multi mode optical fiber , microwave , electronic engineering , electrical impedance , physics , materials science , acoustics , optoelectronics , electrical engineering , engineering , optics , telecommunications , optical fiber
In this article, a new balanced wideband bandpass filter (BPF) is designed using a stub‐loaded multimode resonator (SLMMR) with tightly coupled feeding lines. The wideband response is achieved by designing the first three differential resonant modes of the SLMMR to locate evenly in the designated passband. Good common‐mode (CM) suppression over the passband is obtained by positioning the transmission zero produced by one half of the low‐impedance section (which serves as a shunt open‐circuited stub while the BPF is in CM operation) of the SLMMR close to the in‐band common modes. A prototype of the proposed BPF is fabricated and measured; the measured (simulated) minimum differential‐mode insertion loss (IL) is 0.7 (0.3) dB and the measured (simulated) CM IL is greater than 20.3 (20.1) dB in 1–10 GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2629–2633, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27110