Design of Notched-Wideband Bandpass Filters With Reconfigurable Bandwidth Based on Terminated Cross-Shaped Resonators

Bi, Xiao‐Kun; Zhang, Xiao; Wong, Sai‐Wai; Guo, Shaohua; Yuan, Tao

doi:10.1109/access.2020.2975379

Cited by 15 publications

(9 citation statements)

References 29 publications

(20 reference statements)

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“…In summary, without a need for extra filtering circuits, the design presented in [71] offers a new solution for current and future filtering antenna designs. Additionally, many reconfigurable microstrip filter-antenna structures have been presented and discussed [72][73][74][75][76][77][78][79][80][81][82][83][84][85][86]. In [79], a multiband tunable filter cascaded with a monopole antenna for cognitive radio communications is presented.…”

Section: Microstrip Filter-antenna (Filtenna) Integrationmentioning

confidence: 99%

A Survey on Reconfigurable Microstrip Filter–Antenna Integration: Recent Developments and Challenges

Al‐Yasir

Parchin

et al. 2020

Electronics

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Reconfigurable and tunable radio frequency (RF) and microwave (MW) components have become exciting topics for many researchers and design engineers in recent years. Reconfigurable microstrip filter–antenna combinations have been studied in the literature to handle multifunctional tasks for wireless communication systems. Using such devices can reduce the need for many RF components and minimize the cost of the whole wireless system, since the changes in the performance of these applications are achieved using electronic tuning techniques. However, with the rapid development of current fourth-generation (4G) and fifth-generation (5G) applications, compact and reconfigurable structures with a wide tuning range are in high demand. However, meeting these requirements comes with some challenges, namely the increased design complexity and system size. Accordingly, this paper aims to discuss these challenges and review the recent developments in the design techniques used for reconfigurable filters and antennas, as well as their integration. Various designs for different applications are studied and investigated in terms of their geometrical structures and operational performance. This paper begins with an introduction to microstrip filters, antennas, and filtering antennas (filtennas). Then, performance comparisons between the key and essential structures for these aspects are presented and discussed. Furthermore, a comparison between several RF reconfiguration techniques, current challenges, and future developments is presented and discussed in this review. Among several reconfigurable structures, the most efficient designs with the best attractive features are addressed and highlighted in this paper to improve the performance of RF and MW front end systems.

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Section: Microstrip Filter-antenna (Filtenna) Integrationmentioning

confidence: 99%

A Survey on Reconfigurable Microstrip Filter–Antenna Integration: Recent Developments and Challenges

Al‐Yasir

Parchin

et al. 2020

Electronics

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“…In all the reported research works, the filters are designed to offer tuning over a narrow range of frequencies. In most of the said works, bandwidth reconfiguration is obtained by varying the lower/upper transmission zeros while retaining the centre frequency (Bi et al , 2020; Bi et al , 2021; Arain et al , 2020). The research reported by Chen et al (2021) has realized bandwidth reconfiguration by varying the centre frequency.…”

Section: Introductionmentioning

confidence: 99%

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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“…Therefore, wideband filters with notched bands are still in great need. Many methods have been reported to realize one or more notched frequencies in the passband, such as resonators 1 , exponential tapered impedance line 2 , embedded open stubs 3 – 5 , varactor-loaded shorted-slots 6 , asymmetric structure 7 , terminated capacitance 8 , signal interaction between main and minor paths 9 , 10 , folded coupling line 11 , 12 , and multi-mode resonator (MMR) 13 – 18 . Most of them use transmission poles and zeros to achieve good wideband performance and controllable notched bands, which can effectively suppress interference 19 – 26 .…”

Section: Introductionmentioning

confidence: 99%

Miniaturized tri-notched wideband bandpass filter with ultrawide upper stopband suppression

Wang

Shi

2021

Sci Rep

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Stepped impedance resonator (SIR) and its derivative resonators are widely used in the design of microwave filters. However, many spurious modes will be introduced into the stopband, resulting in lower upper stopband suppression and performance degradation. Based on the principle of slit line, a method to enhance the upper stopband suppression is proposed and verified by a miniaturized tri-notched wideband bandpass filter based on stub loaded ring resonator (SLRR) and shorted-stub loaded SIR (SSLSIR). The wideband is formed by coupling SLRR and interdigital lines, which has a rectangular DGS on the back of the substrate. Three notched bands with controllable positions in the passband can be produced by inserting two different SSLSIRs inside and outside the SLRR. Four slit lines are loaded on the low impedance stub of SSLSIR to adjust the high-order modes close to the transmission zeros (TZs). The operating frequency of the filter is 2.2–7.6 GHz, and the three notched bands are located at 2.97 GHz, 5.75 GHz and 6.46 GHz, respectively. The measurement results show that the − 20 dB enhanced upper stopband of the filter can reach 32 GHz, which proves that the filter has the characteristic of ultrawide upper stopband suppression while keeping the miniaturization.

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Design of Notched-Wideband Bandpass Filters With Reconfigurable Bandwidth Based on Terminated Cross-Shaped Resonators

Cited by 15 publications

References 29 publications

A Survey on Reconfigurable Microstrip Filter–Antenna Integration: Recent Developments and Challenges

A Survey on Reconfigurable Microstrip Filter–Antenna Integration: Recent Developments and Challenges

Miniaturized bandwidth reconfigurable microwave bandpass filter

Miniaturized tri-notched wideband bandpass filter with ultrawide upper stopband suppression

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