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Development of 6–12 GHz evanescent–mode two–pole low–loss tunable bandpass filter
Author(s) -
Cho Young Seek,
Joshi Himanshu,
Liu Xiaoguang,
Sigmarsson Hjalti H.,
Chappell William J.,
Peroulis Dimitrios
Publication year - 2015
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.29356
Subject(s) - insertion loss , band pass filter , materials science , microwave , wideband , diaphragm (acoustics) , bandwidth (computing) , microelectromechanical systems , optoelectronics , coaxial , optics , acoustics , electrical engineering , engineering , physics , telecommunications , vibration
A very low‐loss tunable evanescent‐mode cavity bandpass filter (BPF) with one‐octave (6–12 GHz) tuning range is presented. To implement a very low‐insertion loss with wideband operation, a new coaxial‐feed structure is devised in the tunable BPF. Across the entire tuning range, the achieved insertion loss is less than 0.5 dB. The 3‐dB fractional bandwidth varies from 6.1% at 6 GHz to 12% at 12 GHz. The tenability is realized using silicon microelectromechanical systems diaphragms with slits that are electrostatically actuated. Direct comparison between a solid diaphragm and the proposed stress‐reduced diaphragm with slits is presented. The bulk of the filter is realized using physical machining of a tall printed circuit board. This article shows the upper frequency limit that is feasible using milling. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2418–2422, 2015