Tunable Bandpass Filter With Continuously-Tuned Center Frequency And Bandwidth

Zhang, X.-Y.; Zhang, Y.-B.; Wang, X.-Y.; Hu, Bin‐Jie

doi:10.1080/09205071.2012.710371

Cited by 3 publications

(2 citation statements)

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“…Many tunable filters have been proposed. Some of them concentrate on the tunability of either the center frequency or the bandwidth , and others deal with simultaneous control of both bandwidth and center frequency .…”

Section: Introductionmentioning

confidence: 99%

A varactor-tuned bandpass filter based on lowpass filter and shorted stubs

Guan

Guo

2014

Microw. Opt. Technol. Lett.

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This article presents a tunable bandpass filter (BPF) which is comprised of a chebyshev stepped‐impedance lowpass filter (LPF), three shorted stubs, three varactors, and some blocking capacitors. Detailed design of the LPF, the effects of the shorted stubs, the schematic of the tunable BPF, and the tuning strategies are investigated. By tuning the reversed‐bias voltages of the varactors, which are shunted with the low impedance of the stepped‐impedance LPF, the operating frequency of the filter is changed. After the tunable BPF is designed and simulated, one experiment filter has been fabricated and tested. The measurement results of the experiment filter show that the center frequency of the tunable filter can be reconfigured from 1.09 to 2.44 GHz if the reversed‐bias voltages are altered within 0–30 V. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:879–883, 2014

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Section: Introductionmentioning

confidence: 99%

A varactor-tuned bandpass filter based on lowpass filter and shorted stubs

Guan

Guo

2014

Microw. Opt. Technol. Lett.

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“…Due to their potential to significantly reduce the overall size and complexity of modern multiband communication systems, RF tunable filters are becoming an active research topic [5][6][7][8][9][10][11][12][13][14][15]. However, none of the above tunable filters have addressed the issue on designing two tunable passbands.…”

Section: Introductionmentioning

confidence: 99%

A Dual-Band Bandpass Filter With a Tunable Passband

Jia¹,

Feng²,

Huang³

et al. 2013

PIER C

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In this paper, a novel dual-band bandpass filter with a tunable passband is proposed. Based on two quarter-wavelength resonators and one half-wavelength resonator, dual-band character is designed by introducing two independent coupling paths. The filter structure is designed and can be divided into two parts. The Transmission Zeros (TZs) are derived through simulation. By varying the reverse bias voltage applied to the varactor diodes which are connected to the resonators, the first passband can be independently tuned. The second passband can be easily controlled by the width of the half-resonator. Finally, simulation results show a first tunable passband with a constant fractional-bandwidth of 3.9 ± 0.3%, a center frequency of 1.472-1.886 GHz, and the second passband almost remains constant with a fractional-bandwidth 2.4% at frequency range 2.24 GHz. The measurement of the fabricated example shows good agreement with the simulation.

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