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An ultrawideband bandpass filter with steeply sloped rejection using stub‐loaded resonator
Author(s) -
Xu Jin,
Hua Changzhou,
Li Bo,
Wang Hui,
Miao Chen,
Wu Wen
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.26538
Subject(s) - passband , band pass filter , stub (electronics) , resonator , high pass filter , acoustics , filter (signal processing) , physics , electronic engineering , engineering , optics , low pass filter , electrical engineering
An ultrawideband (UWB) bandpass filter with steeply sloped rejection is proposed in this article. The proposed filter has five transmission poles inside the passband and four transmission zeros on both side of passband. Using the even‐ and odd‐mode analysis method, closed‐form formulas for the position of poles and zeros are given. Finally, a UWB bandpass filter is fabricated and measured. The simulation and measurement agree well with each other. Furthermore, due to the two tunable transmission zeros very close to the filter passband, the fabricated filter has 136‐ and 72‐dB/GHz slopes in the lower and upper transition band. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 54:326–329, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26538