RF tunable bandstop filters with constant bandwidth based on a doublet configuration
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Related Research Unit(s)
Detail(s)
Original language | English |
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Article number | 5778982 |
Pages (from-to) | 1257-1265 |
Journal / Publication | IEEE Transactions on Industrial Electronics |
Volume | 59 |
Issue number | 2 |
Publication status | Published - Feb 2012 |
Link(s)
Abstract
This paper presents a novel approach to design RF tunable bandstop filters with constant absolute bandwidth. The filters are based on a doublet configuration which is attractive for high-order filter designs. In the doublet, two varactor-tuned resonators, arranged in a mirror-symmetrical manner, are coupled to a main transmission line. A novel coupling scheme is utilized between the resonators and the main line. Theoretical analysis indicates that, as the resonant frequency varies, the coupling coefficient within the fixed coupling region can be inherently changed to desirable values to meet the requirement of constant absolute bandwidth. Using the coupling scheme, constant absolute bandwidth can be obtained without extra circuits to control the coupling strengths. For demonstration, first-order and high-order filters are designed. Comparisons of experimental and simulated results are presented to verify the theoretical predications. © 2011 IEEE.
Research Area(s)
- Bandstop filter, constant bandwidth, coupling scheme, tunable filter
Citation Format(s)
RF tunable bandstop filters with constant bandwidth based on a doublet configuration. / Zhang, Xiu Yin; Chan, Chi Hou; Xue, Quan et al.
In: IEEE Transactions on Industrial Electronics, Vol. 59, No. 2, 5778982, 02.2012, p. 1257-1265.
In: IEEE Transactions on Industrial Electronics, Vol. 59, No. 2, 5778982, 02.2012, p. 1257-1265.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review