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A miniaturized electrically tunable dual‐mode bandpass filter based on liquid crystal technology for microwave applications
Author(s) -
Li Xiang,
Shao Zhenhai,
He Zhaosheng,
Shen Mengkui
Publication year - 2016
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.29892
Subject(s) - microstrip , microwave , band pass filter , materials science , insertion loss , resonator , bandwidth (computing) , optoelectronics , multi band device , dual mode , electronic engineering , electrical engineering , engineering , telecommunications , antenna (radio)
In this letter, a miniaturized electrically tunable bandpass filter, based on liquid crystal (LC) technology, has been designed, manufactured and characterized through particular configuration schemes, which include low cost inverted‐microstrip structures and a dual‐mode inverted‐microstrip square loop resonator with capacitively loaded open‐loop arms. In the filter, its transitions between inverted‐microstrip and microstrip are specifically designed at the I/O ports for the self‐packaged, and its central frequency tenability is induced by applying low AC voltages for low power consumption. By measuring, the filter has a relative central frequency tuning range of 11.7% from 4.01 GHz to 4.51 GHz, and has a relative bandwidth of 13% ± 0.5% over the tuning range, a size of 28 mm × 28 mm, and an insertion loss of 1.9 and 4.5 dB at 4.01 and 4.51 GHz, respectively. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1686–1689, 2016