A 0.61‐2.39 GHz fully tunable bandpass filter with minimum number of loaded varactors

Lan, Bozhang; Li, Hai‐Xiong; Guo, Chao; Ding, Jun

doi:10.1002/mop.31561

Cited by 6 publications

(3 citation statements)

References 6 publications

(11 reference statements)

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“…[1][2][3] Recently, for the purpose of multifunction integration, central frequency and bandwidth tunable filters, called fully tunable filters, are investigated. Some fully tunable filters employ multimode resonators, [4][5][6][7][8] the bandwidth can be tuned by adjusting the frequency splitting of resonant modes. The bandwidth of central frequency tunable filter can also be tuned by utilizing tunable components to tune coupling coefficients directly.…”

Section: Introductionmentioning

confidence: 99%

Fully tunable filter with cross coupling and reconfigurable transmission zero

Feng

Xiang

et al. 2020

Int J RF Microw Comput Aided Eng

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In this article, a novel coupling structure is proposed. The surface voltage and current distribution on this structure can be tuned by changing the ratio of the two capacitances so that the central frequency and coupling coefficient can be tuned. The coupling structure can also be tuned to change the sign of coupling coefficient, which is utilized to control the transmission zero of cross coupled tunable bandpass filter. A second order bandpass filter with tunable central frequency and bandwidth is designed and measured. The measurement shows that the central frequency tuning range is 0.768 to 1.512 GHz and the fractional bandwidth tuning range is 0.052 to 0.18 at 1.14 GHz. It shows that the filter can also be tuned with constant fractional bandwidth or constant absolute bandwidth. A tunable cascaded triple bandpass filter with tunable central frequency and bandwidth is designed and measured, as well. The crosscoupled transmission zero can be configured to locate at either high side or low side of the passband by changing the coupling type of the filter topology.

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Section: Introductionmentioning

confidence: 99%

Fully tunable filter with cross coupling and reconfigurable transmission zero

Feng

Xiang

et al. 2020

Int J RF Microw Comput Aided Eng

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“…The electrically tunable microstrip passband filters (BPFs) have received increasingly great attention due to their compact size, reduced weight, and low cost. [1][2][3] Furthermore, with the development of wireless communication systems, the tunable filters with constant bandwidth are more attractive. [4][5][6][7][8][9][10][11] Generating multiple transmission zeros (TZs) is a good solution to sharpen the skirt and enhance the out of band rejection, which can improve the isolation between two tunable channels.…”

Section: Introductionmentioning

confidence: 99%

“…The electrically tunable microstrip passband filters (BPFs) have received increasingly great attention due to their compact size, reduced weight, and low cost . Furthermore, with the development of wireless communication systems, the tunable filters with constant bandwidth are more attractive .…”

Section: Introductionmentioning

confidence: 99%

Compact high‐selectivity tunable dual‐mode filter with constant bandwidth by adopting frequency‐dependent S‐L coupling

Zhu

Xue

Sun

et al. 2019

Micro & Optical Tech Letters

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A compact high‐selectivity tunable dual‐mode microstrip bandpass filter (BPF) with constant bandwidth is proposed in this letter. Three self‐adaptive transmission zeros (TZs) are generated due to the frequency‐dependent source‐load (S‐L) coupling and intrinsic characteristic of dual‐mode resonator, which can sharpen the skirt and deepen the upper stopband. The passband performance can be mainly determined by the pole separation Δf of dual‐mode and external quality factor Qe. Finally, a tunable filter with tuning range from 1.15 to 1.65GHz, constant 3 dB absolute bandwidth (ABW3dB) of 120 ± 5 MHz is designed and fabricated. The measurement results show good agreement with simulated ones, which confirms the design feasibility.

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Recent development in reconfigurable dielectric resonator antenna and microwave filter: design and application

Rai,

Ranjan,

Chowdhury

2024

Int J Communication

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SummaryDeveloping wireless communication systems depends on reconfigurable microwave filters (MF) and dielectric resonator antenna (DRA) because the functionality of the various filters and antennas available for a wireless communication system is limited, and reconfigurable DRA and MF are utilized to overcome these limitations. The throughput of a multiantenna system can be achieved with reconfigurable DRA and filter. Various switching strategies and classifications of reconfigurable DRA and MF are presented. The electrical reconfiguration technique is most suitable for developing a reconfigurable DRA and filter among all the switching techniques. In this approach, reconfigurability may be accomplished by utilizing a PIN diode, a varactor diode, and a radio‐frequency microelectromechanical switch (RF‐MEMS). These switches are more reliable, highly efficient, and easily integrated with the microwave circuit. Reconfigurable DRA with machine learning is demonstrated. The application of reconfigurable DRA and filters in cognitive radio (CR) is also demonstrated. Also, the review article focused on the performance parameters, design, and challenges of reconfigurable antenna and MF.

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A 0.61‐2.39 GHz fully tunable bandpass filter with minimum number of loaded varactors

Cited by 6 publications

References 6 publications

Fully tunable filter with cross coupling and reconfigurable transmission zero

Fully tunable filter with cross coupling and reconfigurable transmission zero

Compact high‐selectivity tunable dual‐mode filter with constant bandwidth by adopting frequency‐dependent S‐L coupling

Recent development in reconfigurable dielectric resonator antenna and microwave filter: design and application

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