Results 21 to 30 of about 137,852 (257)
Narrow-band optical filter through phase conjugation by nondegenerate four-wave mixing in sodium vapor [PDF]
, 1981 An ultrahigh-Q tunable optical filter with a FWHM bandwidth of 41 MHz is demonstrated. The filtering is produced by nondegenerate phase conjugation through four-wave mixing in atomic-sodium vapor.
Gluck, Natalie S. +2 more
core +1 more source
21.69–24.36 GHz MEMS Tunable Band-Pass Filter
Micromachines, 2016 The K-band microelectromechanical systems (MEMS) tunable band-pass filter, with a wide-frequency tunable range and miniature size, is able to fulfill the requirements of the multiband satellite communication systems.
Zhongliang Deng, Hao Wei, Xubing Guo
doaj +1 more source
Tunable active chirped-corrugation waveguide filters [PDF]
, 1989 A novel tunable semiconductor waveguide reflection filter is proposed and analyzed. The filter is based on spatially selective gain pumping of a chirped-corrugation waveguide.
Mittelstein, Michael +2 more
core +1 more source
Frequency-Tunable and Pattern Diversity Antennas for Cognitive Radio Applications
International Journal of Antennas and Propagation, 2014 Frequency-tunable microstrip antennas, for cognitive radio applications, are proposed herein. The approach is based on tuning the operating frequency of a bandpass filter that is incorporated into a wideband antenna.
A. H. Ramadan +4 more
doaj +1 more source
Tunable Optical Filters Using Compound Ring Resonators for DWDM [PDF]
, 2003 The device is based on a loop mirror in a ring resonator. The loop mirror allows tuning by changing the coupling coefficient of a directional coupler. The loop mirror is implemented using a Sagnac configuration to have the same optical path between the ...
Corredera, Pedro +3 more
core +3 more sources
IEEE Photonics Journal, 2017 We present a new tunable all-fiber compact multimode fiber (MMF)-based filter and its applications in fiber sensors. Using the matrix optics approach, we theoretically analyze the transmission characteristics of the tunable filter.
Li Wei +3 more
doaj +1 more source
Calculated and measured transmittance of a tunable metallic photonic crystal filter for terahertz frequencies [PDF]
, 2003 A tunable metallic photonic crystal filter with a mechanical tuning mechanism is demonstrated. The performance is predicted with rigorous full-vector electromagnetic simulations (finite-difference time domain).
Blaikie, R.J. +2 more
core +1 more source
RF transversal filter using an AOTF [PDF]
, 2004 An acoustooptic tunable filter (AOTF) is employed in an optical system to obtain an independently tunable and reconfigurable radio-frequency transversal filter.
Mansoori, S, Mitchell, A
core +1 more source
IEEE Photonics Journal, 2015 The wavelength-tunable filter is a key device for creating colorless, directionless, and contentionless reconfigurable optical add-drop multiplexers.
Shoichi Takashina +4 more
doaj +1 more source
Concept for Continuously Tunable Output Filters for Digital Transmitter Architectures
IEEE Access, 2019 This paper presents a novel output filter approach for continuously frequency-tunable digital power amplifiers, suitable for future seamless and band-less applications in 5G, e.g. for cognitive radios (CR). The presented tunable output filter is based on
Christian Schuster +8 more
doaj +1 more source