Tunable slotted ground structured bandstop filter with BST varactors

Chun, Young-Hoon; Bao, Peng; Jackson, Tim; Lancaster, M.J.

doi:10.1049/iet-map.2008.0308

Cited by 18 publications

(12 citation statements)

References 11 publications

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“…Thus, there is a particular requirement in designing tunable bandstop filters for such systems. Variety of configurations and methods have been developed for tunable bandstop filters [1]- [8]. The filter in [1] incorporates λ/2 coupled line resonators yielding a large circuit size.…”

Section: Introductionmentioning

confidence: 99%

Continuously Tunable Dual-Mode Bandstop Filter

Ebrahimi¹,

Baum²,

Scott³

et al. 2018

IEEE Microw. Wireless Compon. Lett.

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A varactor-based tunable bandstop filter has been proposed in this article. The proposed filter is based on a dualmode circuit developed by introducing inductive and capacitive couplings into a notch filter. The frequency tunability is achieved by using varactor diodes instead of the lumped capacitors in the circuit. Next, the equivalent circuit model has been implemented in planar microstrip technology using thin inductive traces and varactor diodes. The fabricated filter prototype shows a continuous center frequency tuning range of 0.66 − 0.99 GHz with a compact size of 0.12λg × 0.16λg, where λg is the guided wavelength at the middle frequency of the tuning range.Index Terms-Bandstop filter, dual-mode filter, second-order filter, tunable filter.

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Section: Introductionmentioning

confidence: 99%

Continuously Tunable Dual-Mode Bandstop Filter

Ebrahimi¹,

Baum²,

Scott³

et al. 2018

IEEE Microw. Wireless Compon. Lett.

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“…In [7], several tunable dumbbellshaped DGS were proposed to achieve a tuning range extending to 19% using commercially available diode varactors. In [8], a barium-strontium-titanate (BST) varactor chip was deployed to tune the open loop slot DGS resonator which obtained the tunable center frequency from 4.5 to 5.5 GHz. Though the research on reconfigurable DGSs has made obvious progress, however, to the best of our knowledge, most of these DGSs with tunable functions focus on frequency tunability and few papers about the reconfigurable bandwidth have been published.…”

Section: Introductionmentioning

confidence: 99%

A Novel Defected Ground Structure With Both Adjustable Center Frequency and Reconfigurable Bandwidth

Xue¹,

Zhao²,

Yang³

et al. 2014

PIER Letters

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Abstract-A new defected ground structure (DGS) with tunable working frequency and reconfigurable bandwidth is proposed in this paper. The prototype combines the conventional DGS with T-shaped patch featuring narrow bandwidth and two such units located symmetrically featuring wide bandwidth. The proposed structure is designed, simulated and measured. By embedding two reversely-set PIN diodes and four varactors, the proposed structure achieves a narrow bandwidth with a tuning range of 21.1% and a wide bandwidth with a tuning range of 24.6%. In comparison, the bandwidth (−10 dB) is about 13.6% for the narrowband state and 49.2% for the broadband state, where an approximately 4-times extension is obtained.

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“…The diverse techniques for reconfigurable bandstop filter are introduced in Refs. . The article presents the tunable center bandstop filter using varactors of electromagnetic bandgap structure on the ground .…”

Section: Introductionmentioning

confidence: 99%

“…. The article presents the tunable center bandstop filter using varactors of electromagnetic bandgap structure on the ground . The filter takes disadvantage of etching on both sides of the substrate.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable bandstop filter with tunable center frequency and bandwidth using piezoelectric transducer

Jun

Chang

2013

Micro & Optical Tech Letters

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A reconfigurable bandstop filter with tunable center frequency and bandwidth using a piezoelectric transducer (PET) is presented. The proposed reconfigurable bandstrop filter consists of a PET and two quarter‐wavelength open‐stub microstrip lines. Tuning center frequency and bandwidth are achieved by varying the dielectric constants of a quarter‐wavelength open‐stub microstrip line using a controlled dielectric perturber under a PET in two quarter‐wavelength open‐stub microstrip lines. The proposed filter has a 8.7% tuning range at center freuqnecy from 4.62 to 5.06 GHz and 29% tuning range of bandwidth (>25 dB) from 990 to 1280 MHz with varied DC voltages. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2670–2672, 2013

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Tunable slotted ground structured bandstop filter with BST varactors

Cited by 18 publications

References 11 publications

Continuously Tunable Dual-Mode Bandstop Filter

Continuously Tunable Dual-Mode Bandstop Filter

A Novel Defected Ground Structure With Both Adjustable Center Frequency and Reconfigurable Bandwidth

Reconfigurable bandstop filter with tunable center frequency and bandwidth using piezoelectric transducer

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