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Dual‐band bandpass to bandstop switchable filter with independently tunable center frequency and bandwidth
Author(s) -
Narayana Shriman,
Singh Yatendra Kumar
Publication year - 2021
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.32939
Subject(s) - center frequency , varicap , passband , band pass filter , resonator , bandwidth (computing) , stub (electronics) , multi band device , physics , optoelectronics , electrical engineering , materials science , optics , telecommunications , capacitance , engineering , electrode , quantum mechanics , antenna (radio)
This article presents a dual‐band bandpass (BP) to bandstop (BS) switchable filter with independently tunable center frequency and bandwidth. Two different length half‐wavelength resonators are coupled with two separate coupling lines. Each resonator consists of a varactor‐loaded stub at the center to tune the even mode frequencies, whereas two identical varactors are connected at the ends to tune odd and even mode frequencies simultaneously. The center frequency of the first passband is tuned from 1.03 to 1.4 GHz with constant fractional bandwidth (CFBW) of 3.4%, and second passband from 1.35 to 1.74 GHz with CFBW of 2%. BP to BS switching is achieved by connecting a p‐i‐n diode between input and output feedlines.