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Academic literature on the topic 'Narrow band Filters'

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Published: 6 September 2023

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Journal articles on the topic "Narrow band Filters"

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Hruschka, Crassen, Udo Barabas, and Lutz Gohler. "Optical narrow band filter without resonance's." Facta universitatis - series: Electronics and Energetics 17, no. 2 (2004): 209–17. http://dx.doi.org/10.2298/fuee0402209h.

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This paper introduces an optical wave filter, which uses gratings at 45? or 135? inclined grating lines that avoid any resonance's. Therefore, many more options to form the filter shape exist. In general, the filter design can be traced to that of transversal filters (finite impulse response filter, FIR filter). Such an integrated optical wave filter is characterized by steep filter slopes and a narrow pass band (less then 01nm) combined with a high stop band attenuation (more than 40dB) and a linear phase response in the pass band. Compared to conventional Bragg grating filters, the inclined grating line filters can have a flatter pass band and steeper filter skirts related to the width of the pass band. In general, the filter's realization is possible using any optical material. In view of the excellent optical properties the semiconductor material system InP/InGaAsP is used for manufacturing the filter.
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Hou, Hai-Gang, Shahid Hussain, Hai-Cheng Shao, Gui-Wu Liu, Ming-Song Wang, Guan-Jun Qiao, and Asma Shaheen. "Experimental Insights on Factors Influencing Sensitivity of Thin Film Narrow Band-Pass Filters." Journal of Nanoelectronics and Optoelectronics 14, no. 11 (November 1, 2019): 1548–54. http://dx.doi.org/10.1166/jno.2019.2663.

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First time study for development of relationship between design and fabrication of thin film narrow-pass filters simulated using the Essential Macleod optical coating design program and verified through experimental data. In thin film narrow band-pass filter's design, can design better filter by changing some parameters, but the theoretical designs are often difficult to achieve. The sensitivity of thin film narrow band-pass filters are mainly influenced by the refractive index of cavity layers, number of mirror layers, interference order and number of cavities. Based on analysis of all these aspects, laws of influence are obtained. A narrow band-pass filter with super wide rejection band was designed and fabricated to verify the simulation results, showing a good agreement between the experimental and theoretical observations.
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Shafiee, Maryam, Mohammad Amin Chaychi Zadeh, and Homayoon Oraizi. "Design of Miniaturized Multiband Filters Using Zero Order Resonators for WLAN Applications." International Journal of Microwave Science and Technology 2015 (March 9, 2015): 1–7. http://dx.doi.org/10.1155/2015/345326.

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The objective of this paper is to design miniaturized narrow- and dual-band filters for WLAN application using zero order resonators by the method of least squares. The miniaturization of the narrow-band filter is up to 70% and that of the dual-band filter is up to 64% compared to the available models in the literature. Two prototype models of the narrow-band and dual-band filters are fabricated and measured, which verify the proposed structure for the filter and its design by the presented method, using an equivalent circuit model.
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Mezaal, Y. S., H. H. Saleh, and H. Al-saedi. "New Compact Microstrip Filters Based on Quasi Fractal Resonator." Advanced Electromagnetics 7, no. 4 (September 3, 2018): 93–102. http://dx.doi.org/10.7716/aem.v7i4.883.

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This paper presents new microstrip devices as single band bandpass and multi band bandstop filters. The proposed filters use slotted patch microstrip resonator based on quasi fractal geometry, simulated by AWR12 software package. Both filters have quasi elliptic frequency response, designed at centre frequency of 2.437 GHz for bandpass filter and at band frequencies of 2.434, 4.032, 4.976 and 5.638 GHz GHz respectively, for multi bandstop filter. All filters are employed using RT/Duroid 6010.8 LM substrate of dielectric constant and 1.27 mm dielectric thickness. Simulation results show that the designed quasi fractal bandpass filter has very narrow fractional bandwidth of 0.38 % which is very rare in microstrip filter design. On the other hand, the projected bandstop filter offers multi narrow rejection bands that is useful in broadband wireless schemes influencing from fixed interferences. Both filters present satisfactory S11 and S21 responses besides smallness properties that stand for interesting features of the newest wireless applications. The simulated and measured frequency responses for both designed filters are in good agreement.
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Rajapakse, Nihal C., and John W. Kelly. "INFLUENCE OF R:FR RATIO ON CHRYSANTHEMUM GROWTH." HortScience 26, no. 5 (May 1991): 484c—484. http://dx.doi.org/10.21273/hortsci.26.5.484c.

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The response of chrysanthemum plants to varying R:FR ratios and phytochrome photoequilibrium values (Ø = Pfr/Ptot) was evaluated by growing plants under 6%, or 40% CuSO4 and water spectral filters. Using a narrow band-width (R = 655-665 and FR = 725-735 nm) and a broad bandwidth (R = 600-700 and FR = 700-800 nm) for R:FR calculation, 6% CUSO4 filter transmitted light with greater R:FR (3.9) and grater Ø (0.81) than 40% CuSO4 or water filters. Light transmitted through 40% CuSO4 and water filters had a similar narrow band R:FR ratio (1.2), but the broad band R:FR ratio (2.1) of 40% CuSO4 filter was higher than water filter. Estimated Ø value was similar for both water and 40% CuSO4 filters. Final height of plants grown in CuSO4 chambers was about 30% less than the plants in control chambers. The results suggest that broad band R:FR ratio correlated more closely to plant response than the narrow band R:FR ratio.
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Edison Singh, M. "A Compact Wide Stopband Band Pass SIW Filter For K-Band Applications." Journal of Physics: Conference Series 2236, no. 1 (March 1, 2022): 012012. http://dx.doi.org/10.1088/1742-6596/2236/1/012012.

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Abstract Direct coupled filters have narrow stopband due to higher order modes passband. A compact dual layer band pass filter is proposed with wide stop band. The proposed filter provides the return loss of 16.87db and insertion loss of 2.5dB at the passband frequency 20.9 GHz. The filter size is half of the conventional direct coupled filters. The stop band covers up to 40 GHz with insertion loss below 35dB. The filter has no slot which makes it immune to the EMI/EMC problems.
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Celis, Sebastian, Mohamed Farhat, Abdullah S. Almansouri, Hakan Bagci, and Khaled N. Salama. "Simplified Modal-Cancellation Approach for Substrate-Integrated-Waveguide Narrow-Band Filter Design." Electronics 9, no. 6 (June 9, 2020): 962. http://dx.doi.org/10.3390/electronics9060962.

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Current substrate-integrated-waveguide (SIW) filter design methodologies can be extremely computational and time-inefficient when a narrow-band filter is required. A new approach to designing compact, highly selective narrow-band filters based on smartly positioned obstacles is thus presented here. The proposed modal-cancellation approach is achieved by translating or eliminating undesired modes within the frequency of interest. This is performed by introducing smartly located obstacles in the maxima and nulls of the modes of interest. This approach is different from the traditional inverter technique, where a periodic number of inductive irises are coupled in a ladder configuration to implement the desired response of an nth-order filter, and significantly reduces the complexity of the resulting filter structure. Indeed, the proposed method may be used to design different filters for several frequency bands and various applications. The methodology was experimentally verified through fabricated prototypes.
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Comer, D. "High-frequency narrow-band active filters." IEEE Transactions on Circuits and Systems 33, no. 8 (August 1986): 838–40. http://dx.doi.org/10.1109/tcs.1986.1085995.

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Hayder A. Ahmed, Hayder A. Ahmed. "Improved narrow wavelength band blocking filters." Chinese Optics Letters 7, no. 4 (2009): 352–54. http://dx.doi.org/10.3788/col20090704.0352.

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Al-Majdi, Kadhum, and Yaqeen Sabah Mezaal. "New Miniature Narrow Band Microstrip Diplexer for Recent Wireless Communications." Electronics 12, no. 3 (February 1, 2023): 716. http://dx.doi.org/10.3390/electronics12030716.

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Using Kappa substrate material, a compact microstrip diplexer is developed in this research with two separate channels based on the coupled junction and two bandpass filters functioning in independent frequency bands. Each filter comprises an input/output feed line and a number of resonators with different impedances. The diplexer’s frequency response was modeled and optimized using the Sonnet EM solver. At 2.84 and 4.08 GHz for TX/RX channels, the insertion loss is better than 1 dB for both channels, while the return loss values are 21.2 and 17 dB for transmit and receive filters, respectively. The microstrip diplexer has miniature dimensions of 24 mm × 18 mm with highly narrow bands and band isolation of more than 35 dB. The simulated scattering parameters are in agreement with the measured ones.
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Dissertations / Theses on the topic "Narrow band Filters"

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Thomas, James W. "Efficient narrow-band notch filter." Master's thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-02022010-020151/.

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Gamble, Robin. "A study of narrow-band spectral reflection filters." Thesis, Queen's University Belfast, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335958.

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DeSandre, Lewis Francis. "LASER DAMAGE MEASUREMENTS ON ALL-DIELECTRIC NARROW-BAND FILTERS." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275258.

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Dai, L. Barbara. "Design and realization methods for IIR multiple notch filters and high-speed narrow-band and wide-band filters." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0015/MQ56117.pdf.

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Mohsén, Mikael. "Implementation and Evaluation of Single Filter Frequency Masking Narrow-Band High-Speed Recursive Digital Filters." Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1522.

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In this thesis two versions of a single filter frequency masking narrow-band high-speed recursive digital filter structure, proposed in [1], have been implemented and evaluated considering the maximal clock frequency, the maximal sample frequency and the power consumption. The structures were compared to a conventional filter structure, that was also implemented. The aim was to see if the proposed structure had some benefits when implemented and synthesized, not only in theory. For the synthesis standard cells from AMS csx 0.35 mm CMOS technology were used.

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Machibya, Telesphory Raphael. "Design and compensation of high-frequency, narrow-band, bandpass MOSFET-C filters." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185075.

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Circuit designs that employ only CMOS technology are becoming more desirable than those using traditional bipolar integrated circuit technology. This technology offers a high density of MOS circuitry, good capacitor accuracy and high stability. The availability of techniques for the design and realization of precision filters in fully integrated form has many applications in signal processing VLSI circuits. The design, simulation and compensation of MOS transistor filters are presented. The MOS transistor is used as a voltage controlled resistor. The resulting "MOSFET-C" filters can then be built of MOS transistors, capacitors and operational amplifiers fabricated in MOS technology. The advantages of MOSFET-C filters over other integrated filters are discussed. Desirable MOS transistor circuit configurations for use in these filter designs are also presented. High-order, high-frequency, narrow-band bandpass filters are designed and simulated to give a systematic step-by-step design procedure for realizing MOSFET-C filters. These steps include modifying existing well established and studied filter building blocks for use in this method. The nonidealities associated with MOS transistors, especially at high frequencies, are studied and modeled for simulation. Compensation techniques for these nonidealities, together with those of operational amplifiers are presented and applied to both RC and MOSFET-C filters. A compensation scheme is developed which cancels the op amp effects in second-order filter building blocks.
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Watson, Alexander M. "Fabrication of Micropolarizer and Narrow Band-Pass Pixel Filters for Focal Plane Array." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1324658152.

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Vann, Lelia Belle. "Ultra narrow band fiber optic Bragg grating filters for atmospheric water vapor measurements." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/280456.

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Optical fibers have revolutionized telecommunications. Much of the success of optical fiber lies in its near-ideal properties: low transmission loss, high optical damage threshold, and low optical nonlinearity. The photosensitivity of an optical fiber was accidentally discovered by Hill, et al. in 1978. However, the technological advances made in the field of photosensitive optical fibers are relatively recent. This fascinating technology of photosensitive fiber is based on the principle of a simple in-line all-fiber optical filter. It has been shown that the transmission spectrum of a fiber Bragg grating can be tailored by incorporating multiple phase-shift regions during the fabrication process. Phase shifts open up ultra narrowband transmission windows inside the stop band of the Bragg grating. As a specific application, this research is focused on applying this technology in future space-based water vapor DIfferential Absorption LIDAR (DIAL) systems to improve the performance of space-based LIDAR systems by rejecting the reflected solar background. The primary goal of this research effort was to demonstrate the feasibility of using ultra narrow band fiber optic Bragg grating filters for atmospheric water vapor measurements. Fiber Bragg gratings were fabricated such that two transmission filter peaks occurred and were tunable, one peak at a 946 nm water vapor absorption line and another peak at a region of no absorption. Both transmission peaks were in the middle of a 2.66-nm stop band. Experimental demonstration of both pressure and temperature tuning was achieved and characterization of the performance of several custom-made optical fiber Bragg grating filters was made. To our knowledge these are the first optical fiber gratings made in this frequency range and for this application. The bandwidth and efficiency of these filters were measured and then these measurements were compared with theoretical calculations using a piecewise matrix form of the coupled-mode equation. Finally, an ultra narrow band water vapor DIAL filter was characterized having two pass bands less than 8 pm and peak transmissions greater than 80 percent. Such fiber optic filters are now ready for integrating into space-based water vapor LIDAR systems. More broadly, these filters have the characteristics that will revolutionized satellite remote-sensing.
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Zargarzadeh, MohammadReza. "Filter Design for Interference Cancellation for Wide and Narrow Band RF Systems." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/81132.

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In radio frequency (RF), filtering is an essential part of RF transceivers. They are employed for different purposes of band selection, channel selection, interference cancellation, image rejection, etc. These are all translated in selecting the wanted signal while mitigating the rest. This can be performed by either selecting the desired frequency range by a band pass filter or rejecting the unwanted part by a band stop filter. Although there has been tremendous effort to design RF tunable filters, there is still lack of designs with frequency and bandwidth software-tuning capability at frequencies above 4 GHz. This prevents the implementation of Software Defined Radios (SDR) where software tuning is a critical part in supporting multiple standards and frequency bands. Designing a tunable integrated filter will not only assist in realization of SDR, but it also causes an enormous shrinkage in the size of the circuit by replacing the current bulky off-chip filters. The main purpose of this research is to design integrated band pass and band stop filters aimed to perform interference cancellation. In order to do so, two systems are proposed for this thesis. The first system is a band pass filter capable of frequency and band with tuning for C band frequency range (4-8 GHz) and is implemented in 0.13 µm BiCMOS technology. Frequency tunability is accomplished by using a variable capacitor (varactor) and bandwidth tuning is carried out by employing a negative transconductance cell to compensate for the loss of the elements. Additional circuitry is added to the band pass filter to enhance the selectivity of the filter. The second system is a band stop filter (notch) with the same capability as the band pass filter in terms of tuning. This system is implemented in C band, similar to its band stop counterpart and is capable of tuning its depth by using a negative transconductance in an LC tank. A negative feedback is added to the circuit to improve the bandwidth. While implemented in the same process as the band pass filter, it only employs CMOS transistors since it is generally more attractive due to its lower cost and scalability. Both of the systems mentioned use a varactor for changing the center frequency which is a nonlinear element. Therefore, the nonlinearity of it is modelled using two different methods of nonlinear feedback and Volterra series in order to gain further understanding of the nonlinear process taking place in the LC tank. After the validation of the models proposed using Cadence Virtuoso simulator, two methods of design and tuning are suggested to improve the linearity of the system. After post layout-extraction, the band pass filter is capable of Q tuning in the range of 3 to 270 and higher. With the noise figure of 10 to 14 dB and input 1-dB compression point as high as 2 dBm, the system shows a reasonably good performance along its operating frequency of 4 to 8 GHz. The band stop filter which is designed in the same frequency band can achieve better than 55 dB of rejection with the noise figure of 6.7 to 8.8 dB and 1-dB compression point of -4 dBm. With the power consumption of 39 to 70 mW, the band stop filter can be used in a low power receiver to suppress unwanted signals. The technique used in the band stop filter can be applied to higher frequency ranges if the circuit is implemented in a more advanced silicon technology. Implementing the mentioned filters in a receiver along with other elements of low noise amplifiers, mixers, etc. would be a major step toward full implementation of SDR systems. Studying the linearity theory of varactors would help future designers identify the sources of nonlinearity and suggest more efficient tuning techniques to improve the linearity of RF electronic systems.
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Granado, Talita Conte. "Narrow-Band Imaging (NBI) for endoscopic capsules: optical filters on light source or on imager?" Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18152/tde-17082017-144715/.

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The Narrow-Band Imaging (NBI) technique allows the detection of lesions not identified with white light. Medical studies revealed that the wavelengths of 415 nm and 540 nm of the electromagnetic spectrum correspond to the peaks of hemoglobin absorptions band. The wavelength of 415 nm is located in the blue region of the electromagnetic spectrum, allowing the visualization enhancement of superficial veins. Moreover, the wavelength of 540 nm is located in the green region of the spectrum, and it is related to the visualization of sub-epithelial vessels. Initially, this work aims the design, simulation, fabrication (as well as stablish all the ideal settings for the depositions) and characterization of optical filters for the wavelength around 415 nm and 540 nm, through the application of the Fabry-Perot principle. Additionally, this work aims the investigation of two hypotheses: the first one is test the optical filters on the image sensor, and the second one is to test them on the light sources, in order to determined which adaptation technique is better for improving the image contrast of the blood vessels.
A técnica de Narrow-Band Imaging (NBI), ou imageamento por banda estreita, permite a detecção de lesões que não podem ser identificadas com a luz branca. Estudos clínicos revelaram que os comprimentos de onda de 415 nm e 540 nm do espectro eletromagnético correspondem aos picos de banda de absorção da hemoglobina. O comprimento de onda de 415 nm localiza-se na parte azul do espectro eletromagnético, o que permite uma melhor visualização de vasos superficiais. Além disso, o comprimento de onda 540 nm localiza-se na faixa verde do espectro e está relacionado com a visualização de vasos sub-epitheliais. O intuito deste trabalho é o projeto, simulação, fabricação (assim como estabelecer os parâmetros ideais para as deposições) e caracterização de filtros ópticos para os comprimentos de onda próximos de 415 nm e 540 nm, com aplicação do princípio físico de Fabry-Perot. Posteriormente, pretende-se investigar duas hipóteses: a primeira é a de testar os filtros ópticos no sensor de imagem, e o segundo é a de testá-los nas fontes de luz, para verificar qual técnica de adaptação seria melhor para aumentar o contraste entre os vasos sanguíneos.
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Books on the topic "Narrow band Filters"

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Middleton, D. Effects of narrow-band filters on the output envelopes and phases of joint AM-FM inputs: An analytical extension of the Bedrosian-Rice formulation. [Boulder, CO]: U.S. Dept. of Commerce, National Telecommunications and Information Administration, 1985.

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Middleton, D. Effects of narrow-band filters on the output envelopes and phases of joint AM-FM inputs: An analytical extension of the Bedrosian-Rice formulation. [Boulder, CO]: U.S. Dept. of Commerce, National Telecommunications and Information Administration, 1985.

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Middleton, D. Effects of narrow-band filters on the output envelopes and phases of joint AM-FM inputs: An analytical extension of the Bedrosian-Rice formulation. [Boulder, CO]: U.S. Dept. of Commerce, National Telecommunications and Information Administration, 1985.

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Middleton, D. Effects of narrow-band filters on the output envelopes and phases of joint AM-FM inputs: An analytical extension of the Bedrosian-Rice formulation. [Boulder, CO]: U.S. Dept. of Commerce, National Telecommunications and Information Administration, 1985.

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Middleton, D. Effects of narrow-band filters on the output envelopes and phases of joint AM-FM inputs: An analytical extension of the Bedrosian-Rice formulation. [Boulder, CO]: U.S. Dept. of Commerce, National Telecommunications and Information Administration, 1985.

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Middleton, D. Effects of narrow-band filters on the output envelopes and phases of joint AM-FM inputs: An analytical extension of the Bedrosian-Rice formulation. [Boulder, CO]: U.S. Dept. of Commerce, National Telecommunications and Information Administration, 1985.

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Woon-Seng, Gan, and Kuo Sen M, eds. Subband adaptive filtering: Theory and implementation. Hoboken, N.J: J. Wiley, 2009.

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Soderstrand, Michael A. New algorithms for the detection and elimination of sine waves and other narrow-band signals in the presence of broadband signals and noise. Monterey, Calif: Naval Postgraduate School, 1992.

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Kulkarni, Satish S. Sensitivity analysis and architectural comparison of narrow-band sharp-transition digital filters. 1994.

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Narrow Band-Pass Filters for Low Frequency Applications: Evaluation of Eight Electronics Filter Design Topologies. Speed To Proficiency Research: S2pro(C), 2018.

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Book chapters on the topic "Narrow band Filters"

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Kochergin, Vladimir. "Omnidirectional Narrow-Band-Pass, Band-Pass, and Band-Blocking IR Filters." In Omnidirectional Optical Filters, 197–245. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4757-3793-6_6.

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Schwelb, Otto. "Characteristics of Grating Assisted Couplers Used as Narrow-Band Optical Filters." In Applications of Photonic Technology 2, 293–98. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4757-9250-8_48.

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Lee-Ong, Alembert, and Alfred Allen Buenafe. "Imaging-Enhancing System." In Mastering Endo-Laparoscopic and Thoracoscopic Surgery, 45–49. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3755-2_8.

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AbstractVisualization is one of the fundamental pillars (including CO2 insufflation and instrumentation) critical to performing MIS. Initially evolved from direct view through the laparoscope to indirect view on the monitor projected from a camera system. Early advances were geared towards improving the image quality and reproduction of stereoscopic vision. Current advancements involve in part or in combination, the application of optical filters to manipulate specific light spectrums (narrow-band imaging) and the use of fluorescent dye (indocyanine green-fluorescent imaging) to see beyond what can be viewed with the naked eye, coupled with the advantage of real-time application. Narrow-band imaging is primarily used in gastrointestinal endoscopy to detect mucosal pathologies, while ICG aid in revealing specific structures beneath tissues and assess tissue perfusion; it is finding interest for application in various MIS procedures.
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Wang, L., H. W. Dong, G. Wang, Y. L. Bai, and P. Wang. "Design of Nonpolarizing Narrow Band-Pass Filters with Wide Non-transmission Frequency Range." In Springer Proceedings in Physics, 131–39. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49184-4_13.

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Ghadban, Amina, Moussa El Yahyaoui, Youssra Chatei, Radouane Kouddane, El miloud Ar reyouchi, and Kamal Ghoumid. "60 GHZ Millimeter Wave Generation for RoF Systems Based on the Beat of Narrow-Band Bragg Filters." In Lecture Notes in Electrical Engineering, 10–15. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1405-6_2.

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Rosado, M., and M. Moreno. "Deep Narrow Band Interference Filter Photographs of Selected Extended Planetary Nebulae." In Planetary Nebulae, 171. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0865-9_37.

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Gaurav, Yatindra, and R. K. Chauhan. "Design of Narrow-Band Bandpass Filter with Extended Stopband Using Open-Loop Triangular Resonators." In Smart Computing and Informatics, 153–60. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-5547-8_15.

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Viswanadha, Karteek, and N. S. Raghava. "Design of a Narrow-Band Pass Asymmetric Microstrip Coupled-Line Filter with Distributed Amplifiers at 5.5 GHz for WLAN Applications." In Advances in Intelligent Systems and Computing, 181–87. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1822-1_17.

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Roy, Subhabrata, and Abhijit Chandra. "A Study on the Optimum Selection of Interpolation Factor for the Design of Narrow Transition Band FIR Filter Using IBM." In Computers and Devices for Communication, 465–75. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8366-7_69.

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Milic, Ljiljana. "Frequency-Reponse Masking Techniques." In Multirate Filtering for Digital Signal Processing, 295–315. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-178-0.ch010.

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The initial concept of the frequency-response masking technique was introduced by Neuvo, Cheng-Yu and Mitra (1984). It was shown that the complexity of a linear phase FIR filter can be considerably reduced by using the cascade connection of an interpolated FIR (IFIR) filter and a properly designed FIR filter. The IFIR filter transfer function is obtained by replacing the unit delay z-1 with the delay block z-M, where M is an integer. In this way, the frequency response of the IFIR filter is made periodic. The FIR filter in the cascade is used to eliminate (mask) the images from the IFIR filter frequency response. Two years later, Lim (1986) proposed a complete approach for the application of frequency-response masking technique in designing narrow-band and arbitrary-band linear phase FIR filters. It was shown that the approach given in (Lim, 1986) results in a linear phase FIR filter with a small fraction of nonzero coefficients, and thus is suitable for implementing sharp filters with arbitrary bandwidths. The arithmetic complexity is considerably smaller in comparison with the arithmetic complexity of an optimal FIR filter having the equivalent frequency response. This approach is applied later to IIR filters by Johansson and Wanhammar (1997, 2000). The overall filter is composed of an IIR periodic model filter and its complementary periodic filter, and FIR linearphase masking filters. In this way, the arbitrary-band filter can be designed. For a narrowband filter, the cascade of a periodic filter and masking filter can be used. The frequency-response masking approach is suitable for digital filters with sharp transition bands. Compared to the classical single-filter design, this technique offers the advantage of lower coefficients’ sensitivity, higher computation speed and lower power consumption. Recently, the application of frequency-response masking approach has been extended to filter banks to achieve a sharp band-separation with reduced computational complexity (Furtado, Diniz, Netto, and Saramäki, T. 2005; Rosenbaum, Lövenborg, and Johansson, 2007). In this chapter, we review the frequency-response masking techniques for narrow-band and arbitrary bandwidth IIR filters. We demonstrate through examples that very selective characteristics can be obtained using relatively low-order sub-filters. In this way, stable, low-sensitive filters are obtained.
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Conference papers on the topic "Narrow band Filters"

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Ciosek, Jerzy. "Theory of narrow-band polarizing interference filters." In Optical Interference Coatings. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/oic.1998.tud.3.

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Perfect narrow-band polarizing interference filter (NBPIF) reflects radiation in wide spectral range except radiation of selected wavelength and specified linear polarization. In real systems of NBPIF there are the constructions with feature of narrow-band interference filters and thin-film interference polarizers for the single wavelength. These filters may be designed for different spectral range. Then the different optical materials could be used. NBPIF have been described earlier1-3.
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Strizhachenko, A. V., A. A. Zvyagintsev, V. V. Chizhov, and K. A. Lyalko. "Microwave narrow band filters." In 2010 20th International Crimean Conference "Microwave & Telecommunication Technology" (CriMiCo 2010). IEEE, 2010. http://dx.doi.org/10.1109/crmico.2010.5632635.

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3

B, Eric, Grann, David E. Holcomb, Raymond A. Zuhr, and M. G. Moharam. "Subwavelength Structured Narrow-band Integrated Optical Grating Filters." In Diffractive Optics and Micro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/domo.1998.dmb.5.

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A unique type of narrow-band integrated optical filter is investigated based on embedding a subwavelength resonant grating structure within a planar waveguide. Current integrated narrow-band optical filters are limited by their size, density of devices that can be produced, overall performance, and ability to be actively altered for tuning and modulation purposes. In contrast, the integrated optical filters described in this work can have extremely narrow bandwidths - on the order of a few angstroms. Also, their compact size enables multiple filters to be integrated in a single high density device for signal routing or wavelength discrimination. Manipulating any of the resonant structure’s parameters will tune the output response of the filter, which can be used for modulation or switching applications.
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Belt, Roger F., Mark Randles, John Creamer, and Oscar M. Stafsudd. "Narrow Band Iso-Index Filters for Blue-Green Laser Communications." In Compact Blue-Green Lasers. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/cbgl.1992.the1.

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Communications through the 440-470nm water transmission window requires a laser, a narrow band high field of view filter, and an appropriate detector. Polarization interference filters offer very narrow transmission bands, wide angular field of view, and tuning capability. The Lyot-Ohman, Solc, various hybrids, and recent designs are powerful examples of technologies employing common single crystals of quartz, calcite, or ADP. The superior iso-index filter (no = ne at a particular λ) is potentially the most useful. Materials for iso-index filters are not common since they must be stable single crystals, high quality, and usually involve mixed ions in an isomorphous structure. The research group at UCLA has shown that β"-Al2O3 fulfills these conditions within the Na-Ag system . However, β"-Al2O3 does not melt congruently and large single crystals are not attainable readily. An alternate superionic conductor, β-Al203, behaves similarly and can be grown as sizeable (1 × 6 inch) boules.
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Cooke, Caitlyn M., Jennifer Arroyo, Kuan Zhang, Alfonso Escorcia, Khanh Nguyen, and William R. Deal. "Narrow-band Band-pass Filters for Terahertz Applications." In 2021 IEEE/MTT-S International Microwave Symposium - IMS 2021. IEEE, 2021. http://dx.doi.org/10.1109/ims19712.2021.9575005.

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6

Willey, Ronald R. "Improved Narrow Wavelength Band Blocking Filters." In Laser Science. Washington, D.C.: OSA, 2006. http://dx.doi.org/10.1364/ls.2006.lmf8.

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7

Martindale, A., N. P. Bannister, K. D. M. Harris, G. A. Solan, S. P. Collins, Y. Champouret, V. K. Muppidi, G. W. Fraser, and M. Roy. "Narrow-band x-ray polarizing filters." In Optical Engineering + Applications, edited by Oswald H. W. Siegmund. SPIE, 2007. http://dx.doi.org/10.1117/12.734114.

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Denisov, G. G. "Quasi-optical narrow-band notch filters." In 18th International Conference on Infrared and Millimeter Waves. SPIE, 1993. http://dx.doi.org/10.1117/12.2298611.

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Vindevoghel, J., and P. Descamps. "Narrow band active GaAs MMIC filters in K-band." In 30th European Microwave Conference, 2000. IEEE, 2000. http://dx.doi.org/10.1109/euma.2000.338680.

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Jhang, Jyun-Yuan, Ching-Wen Hsue, and Cheng-Chang Chen. "Narrow-band W filters using parallel stubs." In 2010 International Workshop on Electromagnetics; Applications and Student Innovation (iWEM). IEEE, 2010. http://dx.doi.org/10.1109/aem2c.2010.5578818.

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Reports on the topic "Narrow band Filters"

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Cheng-Yang Tan. A proposed interim improvement to the Tevatron beam position monitors with narrow band crystal filters. Office of Scientific and Technical Information (OSTI), August 2003. http://dx.doi.org/10.2172/813540.

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2

Willemsen, Balam A. Ultra-Narrow Band Tunable Filter. Fort Belvoir, VA: Defense Technical Information Center, December 2005. http://dx.doi.org/10.21236/ada443871.

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