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

Li, Run‐Shuo; Chen, Fu‐Chang

doi:10.1002/mop.30242

Cited by 9 publications

(2 citation statements)

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“…Varactor diodes are utilized to adjust the resonant frequency of the stopband in References 4,5. Reconfigurable bandpass to bandstop filters with tunable bandwidth are introduced in References 6‐8, the center frequencies and bandwidths of these filters can be controlled by adjusting the voltage of varactors, while the bandpass to bandstop transformation is controlled by the SPDT switch 6 or the PIN diodes 7,8 . Besides, some multiband reconfigurable filter and antenna are also proposed in References 9‐11.…”

Section: Introductionmentioning

confidence: 99%

“…Reconfigurable bandpass to bandstop filters with tunable bandwidth are introduced in References 6-8, the center frequencies and bandwidths of these filters can be controlled by adjusting the voltage of varactors, while the bandpass to bandstop transformation is controlled by the SPDT switch 6 or the PIN diodes. 7,8 Besides, some multiband reconfigurable filter and antenna are also proposed in References 9-11. However, the conventional microstrip BSFs composed of shunt open-circuited stubs normally have relative large size, and the voltage regulation mode will increase the complexity of the circuit to some extent.…”

Section: Introductionmentioning

confidence: 99%

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Miniaturized tunable bandstop filter using multilayer technology

Qian

Tian

2020

Micro & Optical Tech Letters

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A new type of miniaturized tunable bandstop filter (BSF) based on multilayer technology is presented in this letter. One of the transmission zero could be individually tuned by replacing an outer replaceable element, which can be considered as part of the inner resonant cell of the bandstop filter. Thus, a tradeoff between the stopband rejection depth and bandwidth can be conveniently realized according to different applications. A bandstop filter works from 3.1 to 4.2 GHz has been designed and fabricated in a low temperature cofired ceramic (LTCC) substrate to verify the proposed concept. By virtue of the LTCC multilayer technology, the filter occupies a very compact volume of 2.0 mm × 1.2 mm × 0.8 mm.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Miniaturized tunable bandstop filter using multilayer technology

Qian

Tian

2020

Micro & Optical Tech Letters

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A highly selective tri‐band bandpass‐to‐bandstop filter with the third band independently tunable

Yang

Zhang

et al. 2021

Engineering Reports

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A highly selective tri-band bandpass (BP)-to-bandstop (BS) filter with the third tunable band and the other two fixed ones is proposed in this article. This filter is based on a novel crossed resonator that is composed of a two-end-open UIR with an open stub and a short stub connected in parallel on both sides of the resonator center. A PIN diode is utilized to achieve BP-to-BS switchable characteristics. Then, varactor diodes loaded at the open stub are employed to obtain the independently tunable third band. In addition, due to the symmetry of the resonator structure, the even-and odd-mode analysis method is used to derive the resonant frequencies. For validation, a tri-band BP-to-BS filter operating at 2.4 GHz (WLAN), 3.3 GHz (WiMAX), and 4.9 GHz (LAA/LTE-U) is designed, manufactured, and measured that achieves the continuous frequency tuning range (FTR) of the third band from 4.52 to 4.90 GHz with return loss (RL) better than 10.05 dB under the BP characteristic, from 4.55 to 4.90 GHz with the rejection level (RL) higher than 15.53 dB under the BS characteristic. The measured results agree well with the simulated ones.

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