Results 171 to 180 of about 19,862 (222)
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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, Roberto Gomez-Garcia
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Independently Tunable Dual-Band Bandpass Filter
2020 17th International Computer Conference on Wavelet Active Media Technology and Information Processing (ICCWAMTIP), 2020A reconfigurable multiband band-pass filter is proposed in this paper, using the structures and techniques of the Stub-loaded Stepped-Impedance Resonators dual-mode configuration. This design uses the source-load link and the shorted T-shaped stub lines.
Aidoo Michael Wilson +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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Switchable and tunable triple-channel bandpass filter
Chinese Physics B, 2022A triple-channel bandpass filter with switchable and tunable functions is proposed, which is based on a triple-mode cross resonator. The varactors and switching diodes are loaded at the end of the resonator. Because of the use of switches, resonators have four working states: conventional single-mode, two dual-modes, and one triple-mode.
Ming-En Tian +4 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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Tunable dual-band terahertz metamaterial bandpass filters
Optics Letters, 2013We report metamaterial terahertz (THz) bandpass filters with tunable dual-band selectivity. The shift in the center frequency of the device is achieved by actively modifying the effective length of the resonators. This was realized by introducing vanadium dioxide (VO2) bridges interconnecting specific regions of each resonator.
Yanhan, Zhu +7 more
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All-Fiber Acousto-Optic Tunable Bandpass Filter
Optical Fiber Communication Conference and International Conference on Quantum Information, 2001We report a novel, 3.5 nm bandpass, zero frequency shift, all-fiber AOTF employing a single acoustic flexural wave to couple light from the core mode to a cladding mode (propagating past a core block) and back again to the core mode.
T.E. Dimmick, D.A. Satorius, G.L. Burdge
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Tunable state-variable bandpass filter
IEE Proceedings G (Electronic Circuits and Systems), 1982A simple method for tuning a state-variable bandpass filter over more than one octave without serious loss in the Q-value is presented. This is accomplished by modifying the input stage by adding one extra variable resistor. Analytical calculations show that there will be a 6% loss in quality factor over the tuning range.
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Highly Tunable Narrow Bandpass MEMS Filter
IEEE Transactions on Electron Devices, 2017We demonstrate a proof-of-concept highly tunable narrow bandpass filter based on electrothermally and electrostatically actuated microelectromechanical-system (MEMS) resonators. The device consists of two mechanically uncoupled clamped–clamped arch resonators, designed such that their resonance frequencies are independently tuned to obtain the desired ...
Md Abdullah Al Hafiz +3 more
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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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