A switchable absolute bandwidth tunable filter with etched slot

Shu, Jiao; Cheng, Chen; Ge, Chuan; Zhang, Yerong

doi:10.1080/09205071.2018.1468283

Cited by 3 publications

(9 citation statements)

References 12 publications

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“…The proposed reconfigurable bandpass filter has a compact footprint in comparison with the research reported in Liu et al (2012), Arain et al (2018), Arain et al (2020), Brito-Brito et al (2012), Jiao Shu (2018) and Simpson et al (2019). The reconfigurable filter is at least 35% smaller than the research reported in the literature.…”

Section: Resultsmentioning

confidence: 71%

“…From the table, the following inferences are made. The proposed reconfigurable bandpass filter has a compact footprint in comparison with the research reported in Liu et al (2012), Arain et al (2018), Arain et al (2020), Brito-Brito et al (2012), Jiao Shu (2018) and Simpson et al (2019). The reconfigurable filter is at least 35% smaller than the research reported in the literature. The proposed reconfigurable filter though larger in footprint compared to Bandyopadhyay et al (2020), Bi et al (2019) and Huang et al (2014) but offers good fractional bandwidth and low loss performance. The proposed reconfigurable filter is suitable for both wideband and narrowband communications which are of particular interest for mobile transceivers operating in rich scattering environments.…”

Section: Resultsmentioning

confidence: 86%

“…The reconfigurable filter is at least 35% smaller than the research reported in the literature.Figure 10 Coupling diagram of the proposed reconfigurable bandpass filter The proposed reconfigurable filter though larger in footprint compared to Bandyopadhyay et al (2020), Bi et al (2019) and Huang et al (2014) but offers good fractional bandwidth and low loss performance.The proposed reconfigurable filter is suitable for both wideband and narrowband communications which are of particular interest for mobile transceivers operating in rich scattering environments. However, many research papers(Arain et al, 2018;Arain et al, 2020;Huang et al, 2014; The reconfigurable filter reported in this research has more reconfigurable states unlike the research reported byHuang et al (2014) andSimpson et al (2019).The loss performance of the proposed active bandpass filter is better than the active filters reported inLiu et al (2012), Brito-Brito et al (2012,Huang et al (2014) and JiaoShu (2018).…”

mentioning

confidence: 65%

“…The reconfigurable filter is at least 35% smaller than the research reported in the literature. The proposed reconfigurable filter though larger in footprint compared to Bandyopadhyay et al (2020), Bi et al (2019) and Huang et al (2014) but offers good fractional bandwidth and low loss performance. The proposed reconfigurable filter is suitable for both wideband and narrowband communications which are of particular interest for mobile transceivers operating in rich scattering environments. However, many research papers (Arain et al , 2018; Arain et al , 2020; Huang et al , 2014; Jiao Shu, 2018) have targeted the tuning of the bandwidth to the central operating frequency. The reconfigurable filter reported in this research has more reconfigurable states unlike the research reported by Huang et al (2014) and Simpson et al (2019). The loss performance of the proposed active bandpass filter is better than the active filters reported in Liu et al (2012), Brito-Brito et al (2012), Huang et al (2014) and Jiao Shu (2018). The fractional bandwidth of the proposed reconfigurable filter under the narrowband state is greater than 15% which is larger than the fractional bandwidth realized by the bandpass filters reported in Liu et al (2012), Bandyopadhyay et al (2020), Brito-Brito et al (2012), Huang et al (2014), Jiao Shu (2018) and Simpson et al (2019). Similarly, under an wideband state, the realized fractional bandwidth is 95% which is wider than the research reported in Arain et al (2018), Arain et al (2020) and Bi et al (2019). The realized unloaded Q -factor is higher compared to the research reported in Bandyopadhyay et al (2020), Huang et al (2014) and Jiao Shu (2018) making the filter more selective and low loss in both the operating states.…”

Section: Resultsmentioning

confidence: 99%

“…The proposed reconfigurable filter is suitable for both wideband and narrowband communications which are of particular interest for mobile transceivers operating in rich scattering environments. However, many research papers (Arain et al , 2018; Arain et al , 2020; Huang et al , 2014; Jiao Shu, 2018) have targeted the tuning of the bandwidth to the central operating frequency.…”

Section: Resultsmentioning

confidence: 99%

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Miniaturized bandwidth reconfigurable microwave bandpass filter

Ponnammal

Manjula²

2022

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Purpose Modern wireless communications need novel microwave components that can be effectively used for high data rate and low-power applications. The operating environment decides the severity of the noise coupled to the transceiver system from the ambient environment. In a deep fading environment, narrowband systems fail where the wideband systems come for rescue. Thus, the microwave components are ought to switch between the narrowband and wideband states. This paper aims to study the design of a bandpass filter to meet the requirements by appropriately switching between the dual narrowband frequencies and single ultra-wideband frequency band. Design/methodology/approach The design and implementation of a compact microwave filter with reconfigurable bandwidth characteristics are presented in this paper. The proposed filter is constructed using a hexagonal ring with shorted perturbation along one corner. The filter is capacitively coupled to the external excitation source. External stubs are connected to the corners of the hexagonal resonator to obtain dual passband characteristics centred at 2.1 and 4.5 GHz. The external stubs are configured to achieve bandwidth reconfigurable characteristics. PIN diodes are used with a suitable biasing network to obtain reconfiguration. In the reconfigured state, the proposed two-port filter offers a continuous bandwidth from 2.1 to 5.9 GHz. The roll-off rate along the band edges is improved by increasing the order of the filter. Findings The proposed filter operates in two states. In state 1, the filter operates with dual frequencies centred around 2 and 4.5 GHz with insertion loss less than <1 dB and return loss greater than 13 dB with a peak return loss of 21 and 31 dB at 2.1 and 2.15 GHz, respectively. In state 2, the filter operates from 2.1 to 5.9 GHz with insertion loss less than 1 dB and return loss greater than 12 dB. The filter exhibits four-pole characteristics with a peak return loss greater than 22 dB. Thus, the fractional bandwidth of the proposed filter is 17% and 16% in state 1, whereas the fractional bandwidth is 95% in state 2. Originality/value The proposed filter is the first of its kind to simultaneously offer miniaturization and bandwidth reconfiguration. The proposed second-order filter has two-pole characteristics in the narrowband state, whereas four-pole characteristics are realized in the wideband state. The growing interest in 4G and 5G wireless communications makes the proposed filter a suitable candidate for operation in the rich scattering environment.

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Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 86%

mentioning

confidence: 65%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Miniaturized bandwidth reconfigurable microwave bandpass filter

Ponnammal

Manjula²

2022

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A bi-patch loaded microstrip line based 1-D periodic structure with enhanced stop bandwidth and band switching characteristics

Shahid

Thalakotuna

Heimlich

2019

Journal of Electromagnetic Waves and Applications

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Diode Based Reconfigurable Microwave Filters for Cognitive Radio Applications: A Review

et al. 2020

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The cognitive radio paradigm for developing next-century wireless communication systems is rapidly entering the mainstream, and various aspects of it are currently being applied in 5G technology, aeronautical engineering, military communications, emergency, and public safety applications, satellite communication, and healthcare. Cognitive radio focuses on the existence of software defined radio architectures that allow dynamic reconfiguration. Many researchers have taken initiatives in the last decade to achieve the reconfiguration ability in cognitive radio systems to support the concept of dynamic spectrum access. As cognitive radio adapts dynamic spectrum allocation for its users, the physical implementation requires reconfigurable filters that can alter the carrier frequencies and bandwidth. Although there are many ways to reconfigure filter operation, diode based reconfiguration has received utmost attention among researchers because of its shorter response delay and easy implementation. In the last decade, researchers have reported several diode-based reconfigurable filters, including their characteristics such as filter function, filter combination, tuning range, variation in bandwidth, isolation, and resonance. However, to examine the potential of these filters in the application of cognitive radio, a comprehensive review needs to be pursued. In this review article, the descriptions of several diode based reconfigurable filters are illustrated with their exhibiting characteristics. The detailed information provided in this article has disclosed that primarily three different types diode based reconfigurable filters have been reported by researchers: Tunable, Switchable, and Hybrid (Both Tunable and Switchable). It is also found that each type of reconfiguration can further be segregated in terms of filter function, centre frequency variation, and bandwidth variation. The detailed categorization of the reconfiguration presented in this paper provides a systematic approach to select the correct reconfigurable filter for the desired frequency reconfiguration in cognitive radio.

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A switchable absolute bandwidth tunable filter with etched slot

Cited by 3 publications

References 12 publications

Miniaturized bandwidth reconfigurable microwave bandpass filter

Miniaturized bandwidth reconfigurable microwave bandpass filter

A bi-patch loaded microstrip line based 1-D periodic structure with enhanced stop bandwidth and band switching characteristics

Diode Based Reconfigurable Microwave Filters for Cognitive Radio Applications: A Review

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