A Novel Wide-Stopband Bandstop Filter With Sharp-Rejection Characteristic and Analytical Theory

Liang, Lihua; Liu, Yuanan; Li, Jiuchao; Li, Shulan; Chen, Yu; Wu, Yongle; Su, Ming

doi:10.2528/pierc13050114

Cited by 9 publications

(8 citation statements)

References 21 publications

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“…which comes in the UWB frequency range. Various stub based bandstop filters are explained in References 1–10. In Reference 1, compact size BSF is explored.…”

Section: Introductionmentioning

confidence: 99%

An ultra‐wideband bandstop filter with circularly etched stub resonator

Rajput

Chauhan

Mukherjee

2021

Micro & Optical Tech Letters

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In this letter, an ultra‐wide band bandstop filter (BSF) with three transmission zeros and one reflection zero is presented. The role of the circular etched shaped stub as a notch pass response is investigated. Further, a compact size of 13 mm × 24.30 mm (0.219λg× 0.410λg) is achieved by employing an interdigital capacitor to increase coupling between the lines. Furthermore, the transmission line model of the filter is proposed, and consequently even and odd mode impedance is calculated analytically. The proposed filter offers an ultra‐wide bandwidth of 6.1 GHz (3.7 GHz‐9.8 GHz) with a rejection depth of 20 dB over the entire rejection band. Moreover, the upper skirt factor of 47.2 dB per GHz is achieved. A prototype of the proposed BSF is fabricated and measured. Simulated and measured results are in good agreement which validates the proposed design.

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“…which comes in the UWB frequency range. Various stub based bandstop filters are explained in References 1–10. In Reference 1, compact size BSF is explored.…”

Section: Introductionmentioning

confidence: 99%

An ultra‐wideband bandstop filter with circularly etched stub resonator

Rajput

Chauhan

Mukherjee

2021

Micro & Optical Tech Letters

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“…The technique of cross coupling is then appreciated due to the ability of generating TZs from building multiple transmission routes without increasing filter size. Introducing cross coupling between open-circuited stubs [6,7] or between unit elements [8][9][10] are the two most common approaches for BSFs. Meanwhile, the construction of multiple main transmission routes is found to be another effective technique to obtain TZs via signal interference mechanism [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of a New Ring Bandstop Filter Using Lumped Equivalent Circuit

Fu¹

2020

PIER Letters

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A new ring wideband bandstop filter (BSF) and its exact design method is proposed and investigated in this letter. The BSF is devised by introducing an additional transmission line to a traditional hairpin bandstop filter in parallel, hence giving enhanced selectivity and attenuation performance. A lumped lowpass equivalent circuit is introduced to explain the mechanism of the filter. Rigorous correspondence between the BSF and its equivalent circuit is established by comparing their even-and odd-mode input admittances. This enables the BSF to be synthesized the same way as lumped filters. Both the BSF and the method have been documented by a design example.

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“…DGS demonstrates a stopband in certain frequency band but degrades the passband performance. Alternatively, a hairpin resonator unit provides very limited stopband and occupies larger size [6][7][8]. In [9], to extend the stopband, a band-stop structure is embedded within a stepped impedance LPF, which supresses the harmonics till certain extent.…”

Section: Introductionmentioning

confidence: 99%

Design of a cheap compact low-pass filter with wide stopband

Bhowmik¹,

Moyra²

2018

AMA_C

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In these work, a cheap and compact Low-Pass filter (LPF) with wide stopband is designed using modified hairpin resonator. The first transmission zero is obtained from the transfer function (TF) analysis of the hairpin resonator. Further, open stubs are added to widen the stopband. An approximate LC equivalent circuit of the proposed structure is derived and the response is in accord with simulated result. A prototype of the proposed LPF is fabricated on FR4 substrate. The proposed LPF has-3 dB cutoff frequency at 1.1 GHz with wide stopband ranging from 1.6 GHz to 11.5 GHz. The size occupied by the proposed LPF is 15.8 mm x 14.3 mm. In the passband region, the insertion loss is-0.3 dB and return loss is better than-25 dB. The proposed LPF is measured and there is a good agreement between the simulated and measured results.

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A Novel Wide-Stopband Bandstop Filter With Sharp-Rejection Characteristic and Analytical Theory

Cited by 9 publications

References 21 publications

An ultra‐wideband bandstop filter with circularly etched stub resonator

An ultra‐wideband bandstop filter with circularly etched stub resonator

Analysis and Design of a New Ring Bandstop Filter Using Lumped Equivalent Circuit

Design of a cheap compact low-pass filter with wide stopband

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