0.7–1.0-GHz Reconfigurable Bandpass-to-Bandstop Filter With Selectable 2- and 4-Pole Responses

Cho, Young-Ho; Rebeiz, Gabriel M.

doi:10.1109/tmtt.2014.2359645

Cited by 44 publications

(15 citation statements)

References 19 publications

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“…diodes [6], [7], micro-electromechanical system (MEMS) devices [8], [9], varactor diodes [10]- [13], complementary metal oxide semiconductors (CMOS) [14], etc. To enable a flexible stop center frequency, various BSFs were developed by adding microstrip resonators loaded with silicon varactor diodes [15]- [17].…”

Section: Introductionmentioning

confidence: 99%

Tunable Bandstop HMSIW Filter With Flexible Center Frequency and Bandwidth Using Liquid Crystal

Xu¹,

Zhang²,

Peng³

et al. 2019

IEEE Access

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This paper reports on a tunable bandstop filter (BSF) with both flexible center frequency and bandwidth. The tunable BSF is based on half-mode substrate integrated waveguide (HMSIW), of which the broadside is coupled with reconfigurable resonators. Using liquid crystal (LC) material as the substrate, a tunable stopband could be obtained by adjusting the bias voltage of the interdigitated microstrip resonator on LC. In order to increase the tunable range of stopband bandwidth, two additional open resonators are implemented at the broadside of HMSIW cavity. For practical validation, the bandstop HMSIW filter using LC is designed and fabricated. Numerical results demonstrate that,by adjusting the voltages of three resonators on LC, either the lower or the higher cutoff frequency could be controlled independently, leading to the flexible and independent tuning ranges of both center frequency from 4.9 to 5.4 GHz and 3-dB bandwidth of stopband from 1.2 to 1.8 GHz (@5.1 GHz). INDEX TERMS Bandstop filter (BSF), half-mode substrate integrated waveguide (HMSIW), liquid crystal (LC), tunable filter.

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Section: Introductionmentioning

confidence: 99%

Tunable Bandstop HMSIW Filter With Flexible Center Frequency and Bandwidth Using Liquid Crystal

Xu¹,

Zhang²,

Peng³

et al. 2019

IEEE Access

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“…In the literature, several researchers put their emphasis on tunable notch filter (or bandstop filter), which can eliminate interferences over a narrow or tunable bandwidth and pass wideband microwave signals. Few paper combine above mentioned reconfigurations into a single filter by using switching structures, controlling transmission zeros (TZs), or controlling coupling coefficient. However, such design is not common in reconfigurable filter field due to its high design complexity.…”

Section: Introductionmentioning

confidence: 99%

A fully reconfigurable bandpass‐to‐notch filter with wide bandwidth tuning range based on external quality factor tuning and multiple‐mode resonator

Lan

Guo

et al. 2019

Micro & Optical Tech Letters

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A fully reconfigurable microstrip bandpass‐to‐notch filter based on varactors is presented in this article. This filter offers wide center frequency and bandwidth tuning flexibility under bandpass mode and wide notch tuning range under notch mode. The entire tuning ability is based on multiple‐mode resonator (MMR) theory and tunable external quality factor for bandpass mode and the introduction of transmission zero (TZ) for notch mode. Under the bandpass mode, the center frequency tuning range is 0.9 to 1.42 GHz, and the bandwidth can be tuned from 0.09 to 1.44 GHz at a fixed center frequency 1.28 GHz. Under notch mode, the notch can be tuned from 0.98 to 2.02GHz. Good agreement can be observed between simulated and measured results.

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“…Tunable bandpass‐to‐bandstop filters with a 2‐ or 4‐pole response were presented based on a coupling diagram with a source/load coupling control using RF MEMS switches in Ref. [ ].…”

Section: Introductionmentioning

confidence: 99%

“…A great number of tunable filters have been reported using different methods. And most of them can be classified into three categories, controllable center frequencies , controllable bandwidth at a fixed frequency , and simultaneously controllable bandwidth and center frequencies .…”

Section: Introductionmentioning

confidence: 99%

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A tunable bandpass‐to‐bandstop filter with controllable bandwidth and high rejection level

Chen

2016

Micro & Optical Tech Letters

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A tunable bandpass‐to‐bandstop filter with controllable bandwidth is proposed in this article. The bandpass‐to‐bandstop transformation can be achieved by adjusting the PIN diode, and bandwidth of the bandpass filter can be controlled by adjusting the voltage of varactors, as the coupling coefficients and the external quality factors (Qe) can be tuned by changing the ratios of the loaded capacitances. In the bandpass mode, a tuning range of 805–1032 MHz (24.7%) with return loss better than 11.5 dB can be achieved. In the bandstop mode, a tuning range of 760–1228 MHz (47.1%) can be obtained. The rejection level of the bandstop mode is higher than 40 dB. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:110–113, 2017

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0.7–1.0-GHz Reconfigurable Bandpass-to-Bandstop Filter With Selectable 2- and 4-Pole Responses

Cited by 44 publications

References 19 publications

Tunable Bandstop HMSIW Filter With Flexible Center Frequency and Bandwidth Using Liquid Crystal

Tunable Bandstop HMSIW Filter With Flexible Center Frequency and Bandwidth Using Liquid Crystal

A fully reconfigurable bandpass‐to‐notch filter with wide bandwidth tuning range based on external quality factor tuning and multiple‐mode resonator

A tunable bandpass‐to‐bandstop filter with controllable bandwidth and high rejection level

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