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Comparison of Tunable Microwave Bandpass Filters
2018 11th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP), 2018The development of software-defined radio and Radio-over-Fiber solutions for the future 5G systems necessitates the availability of small, cost-effective and tunable microwave filters. Possibility of integration is another requirement. As variable capacitance diodes are lossy in the millimeter wave (mmW) region, other solutions are utilized, e.g ...
Bence Cseppento +2 more
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A tunable bandpass patch filter with varactors
2010 IEEE MTT-S International Microwave Symposium, 2010This paper presents a miniaturized tunable bandpass patch filter using varactors. The filter is conceived with a triple-mode circular patch resonator with four slots, where the varactors were connected. The extracted equivalent model, the varactors assembly configuration and their biasing are presented.
A., Serrano +3 more
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Tunable reflectionless microstrip bandpass filters
2018 IEEE Radio and Wireless Symposium (RWS), 2018A class of frequency-reconfigurable reflectionless microstrip bandpass filters is reported. This RF/microwave device is based on a complementary-duplexer architecture made up of a bandpass-type and a bandstop-type channel with resistive termination. Whereas the bandpass channel defines the transmission profile of the overall filter, the input-signal ...
Dimitra Psychogiou +1 more
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Voltage tunable bandpass filter
2015 Signal Processing Symposium (SPSympo), 2015A voltage tunable bandpass filter is presented. The filter is realized in microstrip technology using two stepped-impedance resonators. The voltage tuning is provided by means of varactor diodes. The filter has fixed absolute bandwidth of 30 MHz in the frequency range from 375 MHz to 915 MHz. The insertion loss is lower than 5 dB and return loss better
Arkadiusz Golaszewski, Adam Abramowicz
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Tunable multimode-interference bandpass fiber filter
Optics Letters, 2010We report on a wavelength-tunable filter based on multimode interference (MMI) effects. A typical MMI filter consists of a multimode fiber (MMF) spliced between two single-mode fibers (SMF). The peak wavelength response of the filter exhibits a linear dependence when the length of the MMF is modified.
Antonio-Lopez, J. E. +4 more
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A Tunable Microwave Bandpass Filter
2019A convenient prototype of a reconfigurable microwave filter is presented in this paper. The transmission on defined frequencies are achieved by tunable combined lines. The measured performance of a narrow-band reconfigurable band-pass filter is realized using diodes, capacitors, and a voltage sweep of DC feed.
Mohamed Al Khatib +3 more
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Tunable in-line fiber-optic bandpass filter
Optics Letters, 1994An in-line fiber-optic bandpass wavelength filter has been demonstrated based on a single-mode fiber, side polished into the core, in evanescent contact with a high-index multimode overlay waveguide. Passband linewidths down to 5.2 nm were observed, while spacing between transmission peaks was seen to range from 45 to 256 nm for variation of the ...
K, McCallion, W, Johnstone, G, Fawcett
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Automatically tunable bandpass filter
2017 18th International Carpathian Control Conference (ICCC), 2017This article deals with automatically tunable bandpass second-order IIR filter. Filter is applied on the test stand which is used for active vibration control of sliding bearings with the use of piezoactuators. Control algorithm of vibration control was realized in Simulink and applied in dSPACE control system.
Miroslav Pawlenka, Miroslav Mahdal
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Optical bandpass Lyot filter with tunable bandwidth
2012 19th International Conference on Telecommunications (ICT), 2012We experimentally demonstrate the feasibility of the bandwidth tuning of a liquid-crystal based bandpass Lyot filter. This bandwidth tuning is achieved by applying a voltage to vary the birefringence of the liquid-crystal cells whose optical path difference takes predefined discrete values. We show that for a 2-stage liquid-crystal Lyot filter and at λ
Rachid Hamdi +6 more
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Tunable Bandpass Filter Using a Switched Tunable Diplexer Technique
IEEE Transactions on Industrial Electronics, 2017In this paper, a new technique using two p-i-n diodes to switch between two channels of a tunable diplexer with constant return loss is proposed to design a tunable bandpass filter (BPF) with wide frequency tuning range (FTR). The used third-order tunable diplexer with two independently tuned channels consists of one common varactor-tuned lumped ...
Jin Xu 0004, Yan Zhu
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