Relevant bibliographies by topics / Attenuator

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Attenuator'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 September 2023

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Journal articles on the topic "Attenuator"

1

Yuzvik, Denis A., and Maksim A. Stepanov. "An algorithm for synthesis of a film attenuator with uniform power dissipation along its length." Proceedings of the Russian higher school Academy of sciences, no. 2 (June 30, 2022): 60–69. http://dx.doi.org/10.17212/1727-2769-2022-2-60-69.

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The problem of synthesizing a film attenuator made by applying an absorbing material to a conductor is considered. Since the absorbing material has a parameter of maximum dissipated power per unit area, then when synthesizing an attenuator to attenuate high powers, the problem of exceeding the maximum dissipated power per unit area may arise. A sectional attenuator structure has been proposed, which is a set of sections having different attenuation to reduce the power dissipated per unit area. An algorithm for the synthesis of a sectional attenuator is proposed. The attenuator sections are rectangles of various widths. The attenuation distribution is performed using the Taylor series expansion of mathematical functions. The properties of the functions used to distribute the attenuation related to the problem under consideration were considered. The graphs of the dependence of power on the attenuator section are presented. Power distribution has been confirmed by simulation results. Theoretical calculations were confirmed by simulation results in the CST Microwave Studio software.
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Kim, Jeong-Geun, and Kang-Hee Lee. "An S/C/X-Band 4-Bit Digital Step Attenuator MMIC with 0.25 μm GaN HEMT Technology." Applied Sciences 12, no. 9 (May 7, 2022): 4717. http://dx.doi.org/10.3390/app12094717.

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In this paper, a 4-bit digital step attenuator using 0.25 μm GaN HEMT technology for wideband radar systems is presented. A switched-path attenuator topology with resistive T-type attenuators and double-pole double-throw (DPDT) switches was used to achieve both low insertion loss and phase/amplitude error. The measured insertion loss of the reference state is 2.8–8.3 dB at DC-12 GHz. The input and output return loss are less than 12 dB at DC-12 GHz. An attenuation coverage of 30 dB with a least significant bit of 2 dB was achieved at DC-12 GHz. A root mean square (RMS) amplitude error of 1 dB and a phase error of 8.5° were achieved, respectively. The attenuator chip size is 2.45 mm × 1.75 mm including pads. To the best of the authors’ knowledge, this is the first demonstration of a GaN-based digital step attenuator.
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Hao, Dongning, Wei Zhang, Xiubo Liu, and Yanyan Liu. "A Wideband 6-Bit Digital Attenuator in a GaAs pHEMT MMIC." Electronics 11, no. 14 (July 11, 2022): 2166. http://dx.doi.org/10.3390/electronics11142166.

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A low insertion loss, wideband 6-bit digital step attenuator is implemented in the 0.25-μm GaAs pHEMT process. Modified π- or T-type attenuator structures are adopted to expand the operation frequency bandwidth and reduce the insertion phase violation. Furthermore, the through-wafer via (TWV) is analyzed to reduce the influence of the parasitic effect on the high-frequency performance of the attenuator. The depletion mode single-gate switch transistors are used to control the on-off state of the attenuator, which provides low insertion loss and high isolation. The step of the attenuator is 0.5 dB, and the attenuation range is 31.5 dB. The measurement results show a maximum root mean square (RMS) attenuation error of 0.51 dB and RMS phase error of 6.6 degrees from DC-18 GHz. The chip area is 1.8 × 0.6 mm2.
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Aubakirov, Constantine Y., and Alexander V. Makeev. "DESIGNING MICROWAVE BAND ATTENUATORS AS ELECTRIC FILTERS WITH LOSSES." Interexpo GEO-Siberia 8 (May 21, 2021): 280–87. http://dx.doi.org/10.33764/2618-981x-2021-8-280-287.

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This paper presents the results of modeling attenuators with an attenuation of 1,2 dB and 1,8 dB, based on a harmonic filter with resistive inserts. Resistive inserts were introduced into the low-resistance sections of the harmonic filter, and resistive loops were connected to the high-resistance sections of the filter. An implementation of a 10 dB attenuator based on a quasi-polynomial bandpass filter with losses is proposed. The working frequency band of such attenuators reaches 4 GHz.
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Cui, Hong Ling, Qi Su, and En Li. "Attenuation Distribution Broadband Measurement System of Ceramic Pole Attenuator Used for TWT." Key Engineering Materials 723 (December 2016): 224–29. http://dx.doi.org/10.4028/www.scientific.net/kem.723.224.

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Ceramic pole attenuator is an important part in TWT. The performance of TWT is closely related to the attenuation distribution of ceramic pole. The measurement of attenuation distribution was a difficult problem all the time. The traditional measurement method characterize the attenuation distribution by measuring the resistance distribution. The main disadvantage of this method is that result can not characterize ceramic pole’s performance in microwave condition. In this paper we select double-ridge waveguide as measurement transmission line, and based on the classical “Transmission and Reflection Method” an attenuation distribution measurement system was developed. This measurement system provides a convenient method to get accurate attenuation distribution in microwave condition. X-band and Ku-band ceramic pole attenuators were measured, and curves of attenuation distribution were given in this paper.
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Mitkov, A. S., A. A. Stolyarenko, and M. G. Rubanovich. "FILM ATTENUATORS BASED ON FILTER STRUCTURES WITH DISSIPATIVE LOSSES." Issues of radio electronics, no. 4 (May 10, 2019): 84–89. http://dx.doi.org/10.21778/2218-5453-2019-4-84-89.

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The article presents the results of a study of the frequency properties of a multi-stage high-power attenuator with attenuation of 10 dB in the frequency range 0–3 GHz, obtained on a dielectric substrate made of beryllium ceramics. For its construction, microstrip filters with quarter-wave couplings and dissipative losses are used, as well as additional film resistors made in the form of trapezoidal plumes. These loops have a minimum size in the area of a short circuit. The design features of wide-band microwave attenuators of high power are determined, including the conditions for ensuring uniform distribution of the dissipated microwave power and distribution of the resonant frequencies of low-Q resonators. Equivalent circuits were compiled, which allow to determine the initial structure of the attenuator and optimize its frequency characteristics for any power level.
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Venkanna, B. K., and Swati B. Wadawadagi. "Experimental Investigations on Noise Attenuation of a Twin Cylinder Stationary Diesel Engine with Different Types of Mufflers." Journal of Vibration and Acoustics 121, no. 3 (July 1, 1999): 351–54. http://dx.doi.org/10.1115/1.2893987.

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Together with atmospheric and water pollution, noise pollution is threatening human society with vehicles constituting the major source of noise. The available literature on control measures (1, 2, 3) indicates purely reactive mufflers in general are of more use for fixed speed machinery and dissipative attenuators have the ability to filler out acoustic energies over a wide range of frequencies. This paper presents cm attempt made to use a combination of these major types of mufflers fitted in the exhaust line of a four stroke, twin cylinder stationary diesel engine to attenuate exhaust noise to an acceptable level. A sound attenuation of 19 dBA has been obtained for combined reactive and dissipative (Model—M2, loosely packed with glass wool) attenuator through entire the load range without affecting the engine performance and a sound attenuation of 21 dBA has been obtained for reactive (with baffle plate. Model—M3) muffler through the entire load range with a nominal increase in BSFC at higher loads.
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Fan, Chao, Yahua Ran, and Liqun Ye. "Ultra wideband CMOS digital T-type attenuator with low phase errors." Journal of Semiconductors 43, no. 3 (March 1, 2022): 032401. http://dx.doi.org/10.1088/1674-4926/43/3/032401.

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Abstract A proposed inductive-phase-compensation ultra wideband CMOS digital T-type attenuator design based on an analysis of minimising phase errors is presented in this letter. In a standard CMOS technology, the proposed attenuator is analytically demonstrated to have low phase errors due to the inductive-phase-compensation network. A design equation is inferred and a wide-band 4dB attenuation bit digital attenuator with low phase errors is designed as a test vehicle for the proposed approach.
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Zhou, Shenghao, Hangyu Jiao, Dongxu Liu, Weizhen Liu, Junzhe Lin, Qingkai Han, and Zhong Luo. "Numerical and Experimental Analysis of Pressure Pulsation Attenuator Based on Helmholtz Resonator." Applied Sciences 13, no. 14 (July 20, 2023): 8381. http://dx.doi.org/10.3390/app13148381.

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Due to the development of aviation hydraulic systems towards high pressure and high flow, the frequency range of pressure pulsation becomes wider, and the amplitude of pulsation increases. This puts higher requirements on the attenuation characteristics of the pressure pulsation attenuator. To reduce the damage caused by pressure pulsation to the pipeline, a Helmholtz-type pulsation attenuator (HTPA) is designed, which works through the Helmholtz resonant chamber. The theoretical model of HTPA is established by the method of lumped parameter method and distribution parametric method. The insertion loss is adopted to evaluate its attenuation characteristics. The internal pressure dynamic characteristics and attenuation effect of the HTPA are analyzed by simulation and experimentation. The results show that the pulsation attenuation rate δ was 40% after the installation of the attenuator. In the frequency range of 0–1000 Hz, the maximum insertion loss is 19 dB, which verifies the validity and correctness of the theoretical model.
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Yuan, Jun, Hang Jiang, Zheng-yan Fang, Tian-sheng Wang, Zhi Luo, Feng-xian Jiang, and Gui-hong Yin. "Design and Characteristic Analysis of a New Type of Hydraulic Pulsation Suppressor." E3S Web of Conferences 293 (2021): 02028. http://dx.doi.org/10.1051/e3sconf/202129302028.

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In order to decrease the pressure pulsation of high-pressure hydraulic system and speed up the process of high-pressure hydraulic system, a new type of hydraulic pulsation suppressor is designed. The hydraulic pulsation suppressor is designed on the basis of the structural characteristics and attenuation performance of the expansion chamber attenuator and H-type muffler. The theoretical model of the modern hydraulic pulsation suppressor is established based on the fluid theory, and the attenuation performance of the new hydraulic pulsation suppressor is analyzed. The results demonstrate that the designed new hydraulic pulsation suppressor can attenuate the pressure pulsation with a pulsation frequency of 20 Hz～2000 Hz, and attenuate the frequency bandwidth; the attenuation effect is above 50dB, and the attenuation effect is ideal.
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Dissertations / Theses on the topic "Attenuator"

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Choudhury, Imran. "Design of Variable Attenuators Using Different Kinds of PIN-Diodes." Thesis, Linköpings universitet, Fysik och elektroteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-98674.

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Variable attenuators are important circuits that can be employed in many radio frequency (RF) applications, e.g., in automatic gain control (AGC) amplifiers, broadband gain-control blocks at RF frequencies or as broadband vector modulators. For any applications, low insertion phase shift and low power consumption are of interest. A way to implement variable attenuators is using the RF PIN diode. The PIN diode is characterized by a low doped (I = intrinsic) semiconductor region between p- (P) and n-type (N) semiconductor regions. Besides the variable attenuators, the PIN-diode is used in other RF circuits, such as RF switches, limiters and phase shifters. This project presents the design of variable attenuators at 7.5 GHz and 500 MHz frequency bandwidth for ultra-wideband (UWB) applications using two different PIN diodes. The variable attenuators have a topology based on 90° hybrid couplers. The design is performed using Advance Design Systems (ADS) from Agilent Technologies Inc. After presenting the PIN diode and its equivalent circuit, the theory of the 90° passive directional branch line coupler and the operation principle of the variable attenuators are presented. As the selection of the appropriate PIN diode is a critical step in the design, special attention is dedicated to this aspect. It follows the design of the variable attenuators with extensive descriptions of the simulations in ADS. Firstly, both series and shunt attenuators are presented. However, as these circuits normally offer narrow band variable attenuation, the 900 directional branch line coupler is used in the attenuator for broader band operation. At the end, a double hybrid coupler is found to eliminate the ripple in the high attenuation state of the single hybrid coupled attenuator. So the final topology of the variable attenuator is a double hybrid coupler variable attenuator- Moreover, in this project, different PIN diodes are investigated for variable attenuator applications. Different manufacture companies are currently providing different kinds of PIN diodes in terms of parameters and packages. Every type of PIN diodes are providing different sort of advantages to the designers. That is why it has become more difficult for the RF designers to choose the right device for the specified application. Beside the design of the variable attenuator using PIN diodes, some considerations in form of a guide line to the designers while they are using the PIN diode for designing the variable attenuator. In this work, the used PIN diodes are a beam lead PIN diode and chip PIN diode. The beam lead PIN diode is used because it is manufactured for high frequency and it produces excellent electrical performance and isolation at high frequencies. On the other hand, the chip PIN diode eliminates the problem of package parasitics. However, printed circuit board (PCB) manufacturing limitations at the university laboratory incline the balance in the favor of the beam lead PIN diode, HPND- 4005 from Avagotech, instead of the also considered chip diode MA-COM MA4P202.
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Prokop, Daniel. "Rozbor a konstrukce optického laditelného vláknového útlumového článku pro telekomunikační aplikace." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-376985.

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This paper deals with the possibilities of designing the module for control of the attenuation of the optical signal. The paper describes basics of ber optic transmission and beam e ects. Variants of attenuation cells are characterized in this paper and based on the ndings a solution of the module for control of the attenuation of the optical signal is proposed. Practical section of the thesis deals with the design and physical construction of module for control of the attenuation of the optical signal using MEMS variable optical attenuator.
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Wilson, Cynthia 1974. "A free-carrier based silicon on insulator waveguide attenuator /." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32975.

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All solid-state switches and attenuators are becoming increasingly popular over their mechanical counterparts. Their advantages include smaller size, no moving parts, and faster response times. The device presented here is a silicon on insulator waveguide attenuator, its operation is based on free-carrier absorption of photons. Free-carriers are provided by forward biasing a PIN diode structure integrated in a single mode rib waveguide where the guided mode propagates in the intrinsic region. The device was optimized optically using CAD tools to provide off-state losses of less than 1dB. The PIN diode electrical structure was also optimized to for a maximum power consumption of 1W at maximum attenuation. Good agreement of the theory developed was found when compared to experimental measurements of fabricated prototypes of similar structure. Fabrication and testing of devices according to the specifications arrived at in this thesis is suggested for future work.
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Li, Zhuo. "Structure and function of hip, an attenuator of the Hsp70 chaperone cycle." Diss., Ludwig-Maximilians-Universität München, 2014. http://nbn-resolving.de/urn:nbn:de:bvb:19-166974.

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Fang, Peng. "Analyses of the fungal arginine attenuator peptide's role in the regulation of ribosome stalling /." Full text open access at:, 2003. http://content.ohsu.edu/u?/etd,186.

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Martín, Ortega Álvaro. "Power absorption mechanisms and energy transfer in X-ray gas attenuators." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY006/document.

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Le travail effectué dans le cadre de cette thèse porte sur l'étude d'un atténuateur de rayonnement X à gaz et du plasma produit à l'intérieur. Un atténuateur à gaz est composé d'une chambre remplie du gaz, généralement argon ou krypton à quelques centaines de millibars, qui absorbe la partie de basse énergie d'un spectre de rayonnement X de synchrotron, en réduisant la puissance reçu par les éléments optiques en aval sans affecter les propriétés de la partie de haute énergie du spectre. L'absorption des photons crée une région de gaz chaud et ionisé autour du parcours du faisceau X, en réduisant la densité du gaz localement. A détaillé bilan énergétique entre tous les processus impliqués c'est nécessaire pour être capable de prédire l'absorption et opérer et dessiner atténuateurs a gaz efficacement. Un modèle hybride que combine techniques de modélisation Monte Carlo et fluides à été développé pour déterminer le bilan énergétique et simuler l'absorption de rayonnement X. Le modèle a été valide expérimentalement pas études incluant absorption de puissance, spectroscopie optique d'émission et spectroscopie d'absorption par laser à diodes. Les résultats des simulation et expériences montre un plasma confiné autour du parcours du faisceau X, recombinant dans le volume de gaz et avec une température maximale de plusieurs centaines de Kelvin. Le modèle a été capable de prédire l'absorption de rayons X avec un erreur de entre 10 et 20%, qui permettre son utilisation comme première approximation pour le dessin et opération de atténuateurs a gaz et aussi comme point de partie pour modèles plus affinées
The work done in the context of this thesis focuses in the study of an X-ray gas attenuator and the plasma produced within. An X-ray gas attenuator consists on a vessel filled with gas, usually argon or krypton at a few hundreds millibars, that absorbs the low energy fraction of a synchrotron X-ray spectrum, reducing the power received by downstream optical elements without affecting the properties of the high energy part of the spectrum. The absorption of the photons creates a region of hot, ionized gas around the X-ray beam path, decreasing locally the gas density. A detailed energy balance between all the involved processes is required to be able to predict the absorption and operate and design gas attenuators efficiently. A hybrid model combining Monte Carlo and fluid modelling techniques has been developed to determine the energy balance and simulate the X-ray absorption. The model has been validated by experimental studies including power absorption, optical emission spectroscopy and tunable laser absorption spectroscopy. The results of both simulation and experiments show a plasma confined around the X-ray beam path, recombining in the bulk of the gas and with a maximum temperature of several hundreds of Kelvin. The model was able to predict the X-ray absorption within a 10-20% of error, which allows its use as a first approximation for the design and operation of gas attenuators, and also provides a starting point for more refined models
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Huang, Zhengyu. "Novel Segment Deformable Mirror Based Adaptive Attenuator Used In Wavelength Division Multiplexed Optical Communications Network." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/34454.

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In wavelength division multiplexed (WDM) optical communication networks, signals are amplified periodically by optical amplifiers. Since the gain profiles of optical amplifiers are not flat, equalizers are usually used to maintain signal powers at different wavelengths in equal to avoid crosstalk and data loss. However, fixed attenuation can only compensate fixed input power and amplification. In active network, input power and amplifier gain change with time. Active level compensation at each wavelength is needed. An adaptive attenuator is a device with a chromatically variable transmissivity used to equalize channel powers in wavelength-division multiplexing (WDM) fiber-optic communication lines. In this thesis, a method of Fourier analysis of multi-beam interference is developed. It is shown that the total electric field and relative phase delay of each beam form a Fourier transform pair. Thus methods and properties of Fourier analysis are applicable in multi-beam interference analysis and design. Fourier transform based design is presented. Novel devices that apply such design principles are introduced. Principles and structures of novel adaptive attenuators based on various technologies such as segment deformable mirror, liquid crystal, phase modulation array are given. Simulation results for segment deformable mirror based adaptive attenuator are presented.
Master of Science
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Solow, Steven P. "Characterization of A transcriptional Attenuator in The rpmf-Plsx-Fab Operon of Escherichia coli K-12." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30536.

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Fatty acids are an essential component of the phospholipids of the inner and outer membranes of Escherichia coli. The synthesis of both fatty acids and phospholipids is regulated. Synthesis increases when growth rate increases, is inhibited when starvation occurs, and the fatty acid composition of the membrane changes with growth temperature. Several genes encoding enzymes involved in membrane synthesis are located in the rpmF-plsX-fab operon. In this operon, a gene encoding a phospholipid synthetic gene of unknown function, plsX, lies just downstream of the ribosomal protein gene rpmF and upstream of five fatty acid biosynthetic genes, fabH, fabD, fabG, acpP, and fabF. The operon is also complex; transcription is initiated from at least eight promoters. In addition, some transcripts produced by the operon are cleaved by RNases while others terminate at one of three specific points at the 5' end of plsX. This work demonstrates that a weak transcriptional terminator (an attenuator) lies at the 5' end of plsX. The attenuator was localized to a 200 bp segment. Analysis of the secondary structure of the attenuator mRNA has lead to a model which includes four stem-loop structures. In this model, the plsX start codon lies within the loop of the second stem. Two tandem stems are located directly upstream of the mapped 3' endpoints. Mutational analysis shows that all four stem-loops play a role in attenuator activity. Regulation of the attenuator and the attenuator's mechanism of controlling downstream gene expression were investigated. Ribosome binding to attenuator mRNA, the PlsX protein, ppGpp concentration, and rate of lipid synthesis all appear to have no effect on attenuator activity. Interestingly, growth temperature appears to have an effect on both attenuator activity and the activity of one or more of the promoters upstream of rpmF, P₁, P₂, and P₃. Activity of the three promoters is 4.5-fold higher at 28°C as compared with 42°C. The attenuator also appears to increase expression of downstream genes 2-fold as temperature decreases. Though the attenuator region terminates transcription, growth temperature-regulation of attenuator activity is apparently mediated by a change in stability of the mRNA. These data demonstrate that transcriptional expression of plsX is 9-fold higher at 28°C as compared with 42°C. The striking dependence on temperature of plsX expression suggests a role for PlsX in the temperature modulation of fatty acid incorporation into the membrane phospholipids.
Ph. D.
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Mikul, Alex Olegovich. "SPDT switch, attenuator and 3-bit passive phase shifter based on a novel SiGe PIN diode." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Thesis/Fall2009/a_mikul_111909.pdf.

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Thesis (M.S. in electrical engineering)--Washington State University, December 2009.
Title from PDF title page (viewed on Dec. 28, 2009). "School of Electrical Engineering and Computer Science." Includes bibliographical references (p. 49-51).
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Li, Zhuo [Verfasser], and F. Ulrich [Akademischer Betreuer] Hartl. "Structure and function of hip, an attenuator of the Hsp70 chaperone cycle / Zhuo Li. Betreuer: F. Ulrich Hartl." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2014. http://d-nb.info/1048522393/34.

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Books on the topic "Attenuator"

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Carney, John F. Reusable truck mounted attenuator. [Olympia: Washington State Dept. of Transportation, 1997.

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Allen, Deborah Longhi. Value engineering study of guardrail and impact attenuator repair. McLean, Va: U.S. Dept. of Transportation, Federal Highway Administration, 1987.

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L, Fasanella Edwin, Langley Research Center, and United States. Army. Aerostructures Directorate., eds. Determination of flight hardware configuration of energy-absorbing attenuator for proposed space station crew and equipment translation aid cart. Washington, D.C: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1991.

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FitzGerrell, R. G. Site attenuation. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1985.

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Seismic noise attenuation. Oxford: Pergamon Press, 1990.

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United States. Army Aviation Research and Technology Activity. Aviation Applied Technology Directorate., ed. Operational effects on crashworthy seat attenuators. Fort Eustis, VA: Aviation Applied Technology Directorate, US Army Aviation Research and Technology Activity, 1990.

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Alvarez, Pedro J. J. Bioremediation and Natural Attenuation. New York: John Wiley & Sons, Ltd., 2005.

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Alvarez, Pedro J. J., and Walter A. Illman. Bioremediation and Natural Attenuation. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2005. http://dx.doi.org/10.1002/047173862x.

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Alvarez, Pedro J. J., and Walter A. Illman. Bioremediation and Natural Attenuation. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2005. http://dx.doi.org/10.1002/047173862x.

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Bright, Mildred Ivamide. Attenuation of leachate organic micropollutants by geochemically designed high attenuation landfill liners. Birmingham: University of Birmingham, 1997.

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Book chapters on the topic "Attenuator"

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Weik, Martin H. "attenuator." In Computer Science and Communications Dictionary, 76. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_1000.

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Weik, Martin H. "fixed attenuator." In Computer Science and Communications Dictionary, 612. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_7216.

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Weik, Martin H. "optical attenuator." In Computer Science and Communications Dictionary, 1158. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_12925.

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Weik, Martin H. "displacement attenuator." In Computer Science and Communications Dictionary, 435. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_5310.

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Weik, Martin H. "fiber optic attenuator." In Computer Science and Communications Dictionary, 582. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_6906.

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Weik, Martin H. "fixed optical attenuator." In Computer Science and Communications Dictionary, 614. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_7244.

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Weik, Martin H. "gap-loss attenuator." In Computer Science and Communications Dictionary, 670. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_7877.

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Weik, Martin H. "variable optical attenuator." In Computer Science and Communications Dictionary, 1880. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_20662.

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Weik, Martin H. "longitudinal displacement attenuator." In Computer Science and Communications Dictionary, 929. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_10632.

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Youssef, Ahmed A., and James Haslett. "RF Attenuator Linearization Circuits." In Nanometer CMOS RFICs for Mobile TV Applications, 95–130. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-8604-4_4.

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Conference papers on the topic "Attenuator"

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Zhu, Jiabin, Hua Zhou, and Huayong Yang. "Investigations on Pulsation-Reduction Characteristics of Hydraulic Attenuator Based on Experimental Method." In ASME/BATH 2014 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fpmc2014-7835.

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Three types of hydraulic attenuators are designed and investigated to study the pulsation-reduction characteristics in hydraulic system. Attenuator test rig is established to obtain pressure signals in time domain and frequency domain (5 Hz to 1200 Hz), respectively. Influences of changing source impedance and loading impedance to the attenuation rate (Ka) and pressure ratio of inlet and outlet (Pio) are discussed. Experiment results show that expansion chamber attenuator (ECA) is a better choice for a wide frequency range of pulsation reduction. Two types of perforated tube attenuators (PTA) have better performances in some certain frequency range. The performance of PTA can have further improvements by designing the damping holes diameters. The performance of the attenuator is mainly influenced by pump character and rotating speed. The system loading has limited influence on the performance comparing to source impedance.
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Shang, Xia, Hua Zhou, Anhuan Xie, and Jiabin Zhu. "Filtering Characteristics of String Hydraulic Pulsation Attenuator." In ASME 2017 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/dscc2017-5312.

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In order to attenuate the pulsation of the hydraulic systems, the string hydraulic pulsation attenuator is proposed using the principle of mechanical vibration absorption. We present a new type of mechanical structure that can attenuate the pulsation as well as reduce the noise. Elastic strings and fluid can be seen as a forced vibratory system. Resonant cavities isolated by inner pipes of the string hydraulic pulsation attenuator and the damping orifices on inner pipes constitute the Helmholtz resonant structure. It’s a way to realize the effect of structural resonant and fluid resonant filtering. Based on the dynamic characteristics of the pipeline, the transfer matrix model of the string hydraulic pulsation attenuator is established. The attenuation performance of the string hydraulic pulsation attenuator is evaluated by insertion loss. In MATLAB software, we simulate the pulsating characteristics to analyze the relationship between the main structural parameters and the characteristics of pulsating pressure. The simulated theoretical results are compared and analyzed, which indicates that the string hydraulic pulsation attenuator is very effective for filtering in a very wide frequency range. Pulsation attenuating is good for improving the life of components and the working reliability. Noise reducing is good for people’s health at the working-site. Especially under some secret circumstances, controlling noise is a must.
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Pal, Biswajit, Mrinal Kanti Mandal, Manisha Kahar, and Santanu Dwari. "Filtering Attenuator with Electronically Tunable Attenuation." In 2021 IEEE MTT-S International Microwave and RF Conference (IMARC). IEEE, 2021. http://dx.doi.org/10.1109/imarc49196.2021.9714562.

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Uddin, M. Rakib, Jin Wallner, Amit Dikshit, Yukta Timalsina, S. Khatijah, Nicholas M. Fahrenkopf, and David L. Harame. "Silicon Rib-waveguide based On-chip Optical Attenuator." In Bragg Gratings, Photosensitivity and Poling in Glass Waveguides and Materials. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/bgppm.2022.jw3a.3.

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A 30-µm length silicon rib-waveguide based on-chip optical attenuator is fabricated and experimentally demonstrated. For a wide range of wavelengths (1490-1590nm), the attenuator offers around 2.6 dB of attenuation at 1.5V.
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Lin, Cheng-Hsuan, Shih-Yi Wen, Chieh Hu, Hsiao-Wen Lee, and Wensyang Hsu. "A Variable Optical Attenuator With Tunable Mirror Curvature." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33318.

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A novel variable optical attenuator is proposed, fabricated, and tested here. The attenuation effect is achieved by changing the curvature of a reflection mirror membrane. In order to demonstrate the proposed principle, concave mirrors with different radii are first used to confirm the attenuation effect. Then a thermal bimorph structure with membrane is used to deform the mirror membrane at different input voltages to show the variable attenuation effect. The size of the mirror membrane, which is made of low-stress Nitride (1.0 μm) with Cr/Au (0.4 μm) on the top surface, is 800 μm × 800 μm. The major two materials in bimorph actuator are low-stress Nitride and Al (1.2 μm). Two other materials, Poly-Si (0.4 μm) and SiO2 (0.5μm), act as the heating and insulation layers in the bimorph beams, respectively. The minimum insertion loss of the attenuator is found to be 0.74 –dB. The attenuation and deflections of the mirror membrane at the central part are calibrated at different input voltages. It shows that and the attenuation is more than 40 –dB at input voltage of 44 V when the central displacement of the mirror membrane is about 16 μm.
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Churkin, Vadim S., Michael G. Rubanovich, and Vladimir P. Razinkin. "Broadband attenuator." In 2011 12th International Conference and Seminar of Young Specialists on Micro/Nanotechnologies and Electron Devices (EDM 2011). IEEE, 2011. http://dx.doi.org/10.1109/edm.2011.6006955.

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Roben, B., K. Lange, and A. Steiger. "Terahertz thin-film attenuator with 35 dB power attenuation." In 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). IEEE, 2022. http://dx.doi.org/10.1109/irmmw-thz50927.2022.9895846.

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Klimeš, L., L. Kozubík, and P. Charvát. "Computational Design Optimization of PCM-Based Attenuator of Fluid Temperature Fluctuations." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10381.

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Abstract A fluid-PCM heat exchanger (attenuator) of a circular design with water as the fluid was investigated both numerically and experimentally. A computational model of the PCM-based attenuator was developed with the use of the control volume method and the effective heat capacity. Square wave fluctuations of the water temperature at the inlet of the attenuator were considered in the study. The model and its functionality was validated by means of experimental data. The experimental investigation was carried out in a lab environment and two tanks containing water of different temperatures with the computer-controlled mixing valve were used to simulate square wave temperature fluctuations. The validated model was then coupled with metaheuristic optimization methods. The bee algorithm, the genetic algorithm, and the particle swarm optimization algorithm were applied in the study. Design optimization of the attenuator was performed with the aim to maximize the attenuation capability of the attenuator, but considering a cost factor as well. Results indicated that the metaheuristic approach represents a viable way for the solution of this kind of problems. All three metaheuristics provided comparable results in terms of the value of objective function as well as of the computational efficiency.
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Gate, Gregory, Huanyu Song, Franz Tavella, and James Glownia. "Attenuators for Ultrafast High Peak Power Laser Pulses Based on Diffraction." In CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/cleo_at.2023.jth2a.125.

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Attenuators must have a damage threshold to handle input pulses while not introducing significant dispersion or altering the spectrum. We have developed such an attenuator based on diffraction that can meets these requirements.
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Figueiredo, Pedro N., and Robert E. Peale. "Plasmonic Infrared Attenuator." In 2019 IEEE Research and Applications of Photonics in Defense Conference (RAPID). IEEE, 2019. http://dx.doi.org/10.1109/rapid.2019.8864416.

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Reports on the topic "Attenuator"

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Robertson, Perry J. Digital attenuator design. Office of Scientific and Technical Information (OSTI), November 2012. http://dx.doi.org/10.2172/1057254.

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Ryutov, D. The LCLS Gas Attenuator Revisited. Office of Scientific and Technical Information (OSTI), June 2005. http://dx.doi.org/10.2172/877752.

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Bryant, Duncan, and Leigh Provost. Walter Marine and Atlantic Reefmaker Wave Attenuator : wave transmission testing results. Engineer Research and Development Center (U.S.), February 2022. http://dx.doi.org/10.21079/11681/43303.

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As part of a testing service agreement with Walter Marine and Atlantic Reefmaker, a 1:5.2 physical model of the Reefmaker Wave Attenuator was constructed and tested by the US Army Engineer Research and Development Center to evaluate its influence on wave attenuation. The tested prototype wave periods ranged from 2.5 to 8 sec with prototype wave heights between 1 ft and 6.5 ft. The Reefmaker Wave Attenuator included orthogonal and square designs and was tested under a variety of configurations including a suspended configuration, a bed-mounted configuration, and a rotated configuration. Testing demonstrated that depending on configurations and wavelength, the wave transmission coefficients ranged from 0.29 to 0.70. The most improvement, however, was demonstrated when testing the square unit designs with transmission coefficients, kt, below 0.51. The smallest kt of 0.29 occurred during square unit testing, which consisted of eight bed-mounted, square Ecosystem disks plus a base unit (24.05 in. freeboard) and with a wave period of 3.0 sec and height of 0.84 ft. Of all 134 tests performed, including the suspended case, the average transmission through the structure was 58%.
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Kishiyama, K., M. Roeben, J. Trent, D. Ryutov, and S. Shen. LCLS XTOD Attenuator System System Concept Report. Office of Scientific and Technical Information (OSTI), April 2006. http://dx.doi.org/10.2172/900460.

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Molnar, J. A. Analysis of FIN Line Feasibility for W-Band Attenuator Applications. Fort Belvoir, VA: Defense Technical Information Center, June 1991. http://dx.doi.org/10.21236/ada237271.

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Ryutov, D. D. The Gas Flow from the Gas Attenuator to the Beam Line. Office of Scientific and Technical Information (OSTI), December 2010. http://dx.doi.org/10.2172/993720.

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Ryutov, D., R. Bionta, M. McKernan, S. Shen, and J. Trent. The Physics Analysis of a Gas Attenuator with Argon as a Working Gas. Office of Scientific and Technical Information (OSTI), December 2005. http://dx.doi.org/10.2172/890613.

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Ryutov, D., R. Bionta, S. Hau-Riege, K. Kishiyama, D. McMahon, M. Roeben, S. Shen, and P. Stefan. The Physics of the Gas Attenuator for the Linac Coherent Light Source (LCLS). Office of Scientific and Technical Information (OSTI), December 2009. http://dx.doi.org/10.2172/1130036.

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Ryutov, ,. D. D. The Physics Analysis of a Gas Attenuator with Argon as a Working Gas. Office of Scientific and Technical Information (OSTI), December 2010. http://dx.doi.org/10.2172/1000329.

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Ryutov, D. D., R. M. Bionta, S. P. Hau-Riege, K. I. Kishiyama, D. McMahon, M. D. Roeben, S. Shen, and P. M. Stefan. The Physics of the Gas Attenuator for the Linac Coherent Light Source (LCLS). Office of Scientific and Technical Information (OSTI), February 2011. http://dx.doi.org/10.2172/1004930.

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