A Compact Wide-Range Frequency and Bandwidth Reconfigurable Filter

Tian, Mingen; Long, Zhihe; Feng, Lijun; He, Leilei; Zhang, Tianliang

doi:10.1109/lmwc.2022.3178722

Cited by 7 publications

(4 citation statements)

References 12 publications

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“…The reconfigurable technology in the bandpass filter is one of the key research contents. [13][14][15][16][17] Reconfigurable technology using electronic components (such as p-i-n diode) is widely used in filter structures. [1][2][3] The electronic reconfigurable type has the advantages of fast speed and small volume.…”

Section: Introductionmentioning

confidence: 99%

“…There are many different technologies to implement bandpass filter, such as microstrip, 1–3 stripline, 4 substrate integrated waveguides (SIW), 5–7 metal rectangular waveguide, 8,9 substrate‐integrated‐suspended‐line (SISL), 10–12 and so on. The reconfigurable technology in the bandpass filter is one of the key research contents 13–17 …”

Section: Introductionmentioning

confidence: 99%

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Novel FR4‐based low loss reconfigurable filter with four operating modes using movable transmission lines

Wang,

Jiang,

Wang

2024

Micro & Optical Tech Letters

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In the letter, a novel reconfigurable filter using movable transmission lines is proposed. The filter is based on substrate‐integrated‐suspended‐line structure with two inner layers, fabricated on low‐cost FR4 substrate. The suspension line and the cavity are completely covered by copper. The suspension line could be freely moved in the air cavity. In the novel structure, the coupled lines have a variable coupling coefficient. With the movements of two transmission lines, the filter has four operating modes and can be tuned, with low insertion loss of less than 0.45 dB, showing promising properties.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel FR4‐based low loss reconfigurable filter with four operating modes using movable transmission lines

Wang,

Jiang,

Wang

2024

Micro & Optical Tech Letters

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“…Bandpass filters (BPFs) with electronically reconfigurable transfer functions are highly-desirable in these systems to enhance existing capabilities, and miniaturize their size [2]. The majority of the tunable BPFs that have been presented to date are large in size and are based on low-quality factor (Q) (around 50-150 for lumped-element (LE) and microstrip-type configurations [3]- [4], and 300-800 for coaxialresonator-based components [5]) resonators. These also exhibit high levels of in-band insertion loss (IL) between 3-10 dB [4], [6].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Wave Resonator-Based Bandpass Filters With Continuously Tunable Fractional Bandwidth

Nasser

Psychogiou

2023

IEEE Trans. Circuits Syst. II

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A new class of acoustic-wave resonator-based bandpass filters (BPFs) with continuously tunable fractional bandwidth (FBW) are presented. They are based on cascaded multi-resonant stages of hybridly-integrated surface acoustic wave (SAW) resonators with lumped element (LE) components. Each stage comprises one SAW resonator and one or more LE resonators that contribute to the overall transfer function to one pole and two transmission zeros (TZs). As such highly-selective quasi-elliptic transfer functions with N poles, 2N TZs and enhanced FBW can be created for two series and N-2 parallel stages. It is shown that by reconfiguring the resonant frequency of the LE resonators, continuously-tunable FBWs can be obtained. The operating principles of the multi-stage concept are demonstrated through design examples of multi-stage prototypes. The concept has been validated at 916.6 MHz through a fourpole/eight-TZ BPF with tunable BW between 0.63-1.32 MHz (i.e., FBW=0.57 -1.32kt 2 ), minimum in-band insertion loss (IL) 3.9-2.3 dB (Qeff =7700-6000) and out-of-band isolation > 27 dB. Index Terms-Acoustic wave resonator (AWR), high quality factor (Q), tunable bandpass filter (BPF), kt 2 -enhancement.

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“…In [25], bandwidth tunability is achieved by independently controlling the adjustable TZs. Good performances have been reported with filters using a crossshaped resonator, a T-shaped resonator, and a higher order coaxial-based resonator [26][27][28][29] or with filters based on short sections of parallel coupled lines and short-circuited stub resonators [30][31][32][33][34][35].…”

mentioning

confidence: 99%

A New Class of High-Selectivity Bandpass Filters With Constant Bandwidth and 5:1 Bandwidth Tuning Ratio

Vryonides,

Arain,

Quddious

et al. 2024

IEEE Access

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This paper presents a design for compact bandpass filters (BPFs) that feature high selectivity. This high selectivity is achieved through the use of open-/short-circuited coupled-line segments at the filter's input and output and a pair of symmetrical parallel-coupled lines connected to a pair of open steppedimpedance resonators (SIRs) introducing three transmission zeros (TZs) on either side of the passband. In addition, two different designs for these BPFs, one with a fixed bandwidth and one with a tunable bandwidth are also presented. The characteristics of the proposed structure are analyzed using even-, odd-mode and ABCD analyses. To enable bandwidth tuning, two varactor diodes are added to the edges of the open SIRs, allowing the TZs to be adjusted around the upper band edge. The paper includes details of two prototypes that were designed, fabricated, and tested: Filter A with a constant bandwidth that covers the entire S-band (2-4 GHz) and a 3-dB fractional bandwidth (FBW) of 60%, and Filter B with a tunable bandwidth and a 3-dB FBW that varies from 12% to 60%. The filters have been measured to have insertion loss of less than 0.8 dB for Filter A and less than 1.1 dB for Filter B throughout the passband, and return loss of greater than 16 dB and 15 dB for Filter A and B, respectively. These filters have a compact size of less than 0.113λg 2 , and feature high selectivity with a wide 3-dB bandwidth tuning range ratio, as well as an upper stopband suppression level of more than 40 dB. INDEX TERMS Bandpass filter (BPF), parallel-coupled lines, selectivity, transmission zeros (TZs). I. INTRODUCTIONCompact planar microwave passive bandpass filters (BPFs) with superior selectivity and high-performance characteristics such as passband flatness, low insertion loss, sharp roll-off skirt, and high out-of-band rejection are some of the main filter performance requirements for modern RF communication systems. A variety of design approaches and structures has been published in literature [1][2][3][4][5][6][7][8][9][10][11][12]. In particular, [1] reports the implementation of different pairs of coupled lines in a BPF with multiple transmission zeros (TZs) and transmission poles (TPs). In [2], a new technique for designing a high-selectivity filter using a coupled-line structure is proposed, with the downside of only adding one pair of symmetrical TZs. In addition, [3] describes a BPF with compact size and two pairs of TZs that uses coupled lines and open/shorted stubs. Pairs of coupled lines are also reported in [4] to improve the out-of-band interference and roll-off rates (ROR). Even though it is only valid for dualband filters, [5] proposes a new method to enhance the selectivity by adding two open-circuited sections to the input This article has been accepted for publication in IEEE Access.

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A Compact Wide-Range Frequency and Bandwidth Reconfigurable Filter

Cited by 7 publications

References 12 publications

Novel FR4‐based low loss reconfigurable filter with four operating modes using movable transmission lines

Novel FR4‐based low loss reconfigurable filter with four operating modes using movable transmission lines

Acoustic Wave Resonator-Based Bandpass Filters With Continuously Tunable Fractional Bandwidth

A New Class of High-Selectivity Bandpass Filters With Constant Bandwidth and 5:1 Bandwidth Tuning Ratio

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