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Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Filters’ design"

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Mewada, Hiren K., and Jitendra Chaudhari. "Low computation digital down converter using polyphase IIR filter." Circuit World 45, no. 3 (August 5, 2019): 169–78. http://dx.doi.org/10.1108/cw-02-2019-0015.

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Purpose The digital down converter (DDC) is a principal component in modern communication systems. The DDC process traditionally entails quadrature down conversion, bandwidth reducing filters and commensurate sample rate reduction. To avoid group delay, distortion linear phase FIR filters are used in the DDC. The filter performance specifications related to deep stopband attenuation, small in-band ripple and narrow transition bandwidth lead to filters with a large number of coefficients. To reduce the computational workload of the filtering process, filtering is often performed as a two-stage process, the first stage being a down sampling Hoegenauer (or cascade-integrated comb) filter and a reduced sample rate FIR filter. An alternative option is an M-Path polyphase partition of a band cantered FIR filter. Even though IIR filters offer reduced workload to implement a specific filtering task, the authors avoid using them because of their poor group delay characteristics. This paper aims to propose the design of M-path, approximately linear phase IIR filters as an alternative option to the M-path FIR filter. Design/methodology/approach Two filter designs are presented in the paper. The first approach uses linear phase IIR low pass structure to reduce the filter’s coefficient. Whereas the second approach uses multipath polyphase structure to design approximately linear phase IIR filter in DDC. Findings The authors have compared the performance and workload of the proposed polyphase structured IIR filters with state-of-the-art filter design used in DDC. The proposed design is seen to satisfy tight design specification with a significant reduction in arithmetic operations and required power consumption. Originality/value The proposed design is an alternate solution to the M-path polyphase FIR filter offering very less number of coefficients in the filter design. Proposed DDC using polyphase structured IIR filter satisfies the requirement of linear phase with the least number of computation cost in comparison with other DDC structure.
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2

Chen, Zhimin, and Lenan Wu. "Design of Special Impacting Filter for Multicarrier ABPSK System." Mathematical Problems in Engineering 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/921932.

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A rather intuitive technique known as pole-zero placement is introduced to illustrate the frequency response of the special impacting filters (SIFs) with a pair of conjugate zero-poles and deduce the equation of the pole radii. Based on that, the paper proposes an iterative scheme to derive the parameters of the cascade notch filter. The cost function is determined by the cascading notch filter’s influence on impacting filters, converting the cost function’s least square problem to a filter parameters’ standard quadratic programming problem. Finally, a cascading notch SIF (CNSIF) designed to demodulate the ABPSK signals is realized.
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Jurisic Bellotti, Maja, and Mladen Vucic. "Sparse FIR Filter Design Based on Signomial Programming." Elektronika ir Elektrotechnika 26, no. 1 (February 16, 2020): 40–45. http://dx.doi.org/10.5755/j01.eie.26.1.23560.

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Анотація:
The goal of sparse FIR filter design is to minimize the number of nonzero filter coefficients, while keeping its frequency response within specified boundaries. Such a design can be formally expressed via minimization of l0-norm of filter’s impulse response. Unfortunately, the corresponding minimization problem has combinatorial complexity. Therefore, many design methods are developed, which solve the problem approximately, or which solve the approximate problem exactly. In this paper, we propose an approach, which is based on the approximation of the l0-norm by an lp-norm with 0 < p < 1. We minimize the lp-norm using recently developed method for signomial programming (SGP). Our design starts with forming a SGP problem that describes filter specifications. The optimum solution of the problem is then found by using iterative procedure, which solves a geometric program in each iteration. The filters whose magnitude responses are constrained in minimax sense are considered. The design examples are provided illustrating that the proposed method, in most cases, results in filters with higher sparsity than those of the filters obtained by recently published methods.
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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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Анотація:
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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Tüzün, Reşat, and Nursel Akçam. "Design of Microstrip Low Pass Filters." Academic Perspective Procedia 1, no. 1 (November 9, 2018): 47–55. http://dx.doi.org/10.33793/acperpro.01.01.13.

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Анотація:
Microstrip filters have a significant role in Radio Frequency/Microwave applications. Microstrip filters are common on microwave circuits, satellite communications, radars, test equipments and so on. Because microstrip filters are compact, cheap and easy to produce, they are highly preferred for microwave applications. Microwave filter; microwave system is a two-ported element used to control the frequency response at a certain point by attenuating the frequencies in the stop band by transmitting in the frequency band. Typical frequency responses are low pass, high pass, band pass and band stop. Also approaches such as Butterworth, Chebyshev, and Elliptic are defining filter characteristics. In this paper, microstrip filters havign Chebyshev, Elliptic and Maximally Flat approaches were designed. For example Chebyshev filter of design filters having 6 GHz cut frequency and having 46,34 dB at 6,6 GHz. The insertion loss is -3,66 dB at 6 GHz. AWR Sonnet is used for the simulation and analysis of this filters.
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Tsuno, K., T. Kaneyama, T. Honda, Y. Ishida, E. Munro, and J. Rouse. "Omega Filter design for a 200kv TEM." Microscopy and Microanalysis 5, S2 (August 1999): 344–45. http://dx.doi.org/10.1017/s143192760001504x.

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Анотація:
A new omega filter has successfully been installed in 200kV TEMs(see FIG. 1). Energy filtering TEM (EFTEM) is extremely useful to enhance contrast of biological specimens, to observe defects in thick semiconductor tips, to obtain a good compositional map in grain boundaries, to give structure image in the thick specimen regions and to obtain quantitative data by removing plasmon loss signals. In-column filters such as omega filter has advantages over postcolumn filters from points of cancellation of aberrations, to obtain iso-chromatic images and a freedom of selecting variety of magnifications.Here, we discuss conditions of designing an omega filter. In usually, curved axis systems, which are common to energy analysis equipment, has large second order aberrations. Those aberrations are compensated in analyzers with single sector magnet with multi stage sextupole correctors. However, the adjustment of those correctors is difficult and residual aberrations destroy quality of the filtered image.
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Linville, A. Frank. "Single‐channel digital filter design for seismic applications." GEOPHYSICS 59, no. 10 (October 1994): 1584–92. http://dx.doi.org/10.1190/1.1443547.

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Анотація:
A general least‐squares, time‐domain filter design methodology has been developed that is easy to use for a variety of seismic filtering applications. The 1-D finite‐impulse response frequency filter can efficiently provide the noise attenuation and selectivity needed in modern data processing. Flexibility of design allows a choice of all basic types of single‐channel filters commonly used in processing. These include low‐pass, high‐pass, band‐pass, band‐reject, and notch filters. In addition, multiple bands may be passed or rejected using a single operator design without increasing the length of the filter. The ability to reject multiple noise bands with one filter is convenient and also reduces data processing costs. The filter can be viewed as a minimum‐phase Wiener‐Levinson predictive deconvolution filter designed to reject specified frequency bands. The filter is designed from an exact mathematical description of the specified stop bands that provide an explicit expression for the required autocorrelation lags in the normal equations. The filter’s desired frequency response (transition zone width and rejection level) is simply related to two input parameters—operator length and white noise level.
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8

Al-Yasir, Yasir, Naser Ojaroudi Parchin, Raed Abd-Alhameed, Ahmed Abdulkhaleq, and James Noras. "Recent Progress in the Design of 4G/5G Reconfigurable Filters." Electronics 8, no. 1 (January 20, 2019): 114. http://dx.doi.org/10.3390/electronics8010114.

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Анотація:
Currently, several microwave filter designs contend for use in wireless communications. Among various microstrip filter designs, the reconfigurable planar filter presents more advantages and better prospects for communication applications, being compact in size, light-weight and cost-effective. Tuneable microwave filters can reduce the number of switches between electronic components. This paper presents a review of recent reconfigurable microwave filter designs, specifically on current advances in tuneable filters that involve high-quality factor resonator filters to control frequency, bandwidth and selectivity. The most important materials required for this field are also highlighted and surveyed. In addition, the main references for several types of tuneable microstrip filters are reported, especially related to new design technologies. Topics surveyed include microwave and millimetre wave designs for 4G and 5G applications, which use varactors and MEMSs technologies.
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Nguyen, Phuoc Si. "Infinite Impulse Response Digital Filters Design." International Journal of Signal Processing Systems 5, no. 2 (June 2017): 83–88. http://dx.doi.org/10.18178/ijsps.5.2.83-88.

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Rohini, R., N. V. Satya Narayana, and Durgesh Nandan. "A Crystal View on the Design of FIR Filter." Journal of Computational and Theoretical Nanoscience 17, no. 9 (July 1, 2020): 4235–38. http://dx.doi.org/10.1166/jctn.2020.9052.

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Анотація:
In audio and video signal processing main element is the FIR filter. This paper presents complete information regarding the FIR filters. It also focuses on the design of FIR filters which provide low-area, energy-delay, low-power consumption, high-speed, low critical path, and low complexity. Implementation of FIR filters with different methods like memory-based VLSI architecture, filters for sampling rate conversion, linear phase FIR filters, optimal hybrid form FIR filters, Nyquist filters, hybrid multiplier less FIR filters, low complexity FIR filters, variable partition hybrid form FIR filters, area efficiency FIR filters are discussed in this paper. The objective of this paper to provide all related information regarding FIR filters at one platform.
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Дисертації з теми "Filters’ design"

1

Anderson, Martin S. "Design of two-dimensional PCAS digital filters and filter banks." Thesis, University of Warwick, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307968.

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Chen, Tsuhan Vaidyanathan P. P. Vaidyanathan P. P. "Multidimensional multirate filters and filter banks : theory, design, and implementation /." Diss., Pasadena, Calif. : California Institute of Technology, 1993. http://resolver.caltech.edu/CaltechETD:etd-08232007-095226.

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Zakaria, Zahriladha. "Design of lossy filters." Thesis, University of Leeds, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531592.

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Law, Ying Man. "Iterative algorithms for the constrained design of filters and filter banks /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202004%20LAW.

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Анотація:
Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 108-111). Also available in electronic version. Access restricted to campus users.
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Kumar, Bhunesh. "Design of Harmonic Filters for Renewable Energy Applications." Thesis, Högskolan på Gotland, Institutionen för kultur, energi och miljö, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hgo:diva-1862.

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Harmonics are created by non-linear devices connected to the power system. Power system harmonics are multiples of the fundamental power system frequency and these harmonic frequencies can create distorted voltages and currents. Distortion of voltages and currents can affect the power system adversely causing power quality problems. Therefore, estimation of harmonics is of high importance for efficiency of the power system network. The problem of harmonic loss evaluation is of growing importance for renewable power system industry by impacting the operating costs and the useful life of the system components. Non-linear devices such as power electronics converters can inject harmonics alternating currents (AC) in the electrical power system. The number of sensitive loads that require ideal sinusoidal supply voltage for their proper operation has been increasing. To maintain the quality limits proposed by standards to protect the sensitive loads, it is necessary to include some form of filtering device to the power system. Harmonics also increases overall reactive power demanded by equivalent load. Filters have been devised to achieve an optimal control strategy for harmonic alleviation problems. To achieve an acceptable distortion, increase the power quality and to reduce the harmonics hence several three phase filter banks are used and connected in parallel. In this thesis, high order harmonics cases have been suppressed by employing variants of Butterworth, Chebyshev and Cauer filters. MATLAB/SIMULINK wind farm model was used to generate and analyze the different harmonics magnitude and frequency. High voltage direct current (HVDC) lines for an electrical grid that is more than50km far away wind farm generation plant was investigated for harmonics. These HVDC lines are also used in offshore wind farm plant. Investigated three-phase harmonics filters are shunt elements that are used in power systems for decreasing voltage distortion and for correcting the power factor. Renewable energy sources are not the stable source of energy generation like wind, solar and tidal e.t.c. Though they are secondary sources of generation and hard to connect with electrical grid. In near future the technique is to use the wave digital filter (WDF) or circulator-tree wave digital filter (CTWDF) for the renewable energy application can be employed to mitigate the harmonics. These WDF and CTWDF can b eused in HVDC lines and smart grid applications. A preliminary analysis is conducted for such a study.
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Elsayed, Ahmed Elsayed Ahmed. "Design of H#infinity# filters." Thesis, University of Strathclyde, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303235.

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Melgarejo, Lermas Juan Carlos. "Advanced Techniques for the Design and Optimization of Multi-Band and Reconfigurable Microwave Waveguide Filters." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/172728.

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[ES] El creciente número de dispositivos intercambiando datos ha empujado a las empresas del sector espacial a utilizar bandas de frecuencia cada vez más altas, como Ku, K y Ka, ya que permiten emplear canales de frecuencia más anchos. A medida que disminuye la longitud de onda, el tamaño de los filtros se reduce y, por tanto, son más sensibles a las desviaciones de fabricación. Para compensar estos errores, es necesario emplear elementos de sintonía en la etapa de diseño. En este contexto presentamos una estrategia de diseño que permite incluir todos los factores no ideales, como elementos de sintonía o esquinas redondeadas, en las simulaciones finales de filtros y multiplexores. Una vez se han fabricado los filtros es necesario ajustar manualmente los elementos de sintonía hasta recuperar la respuesta objetivo. Sin embargo, para realizar esta tarea con éxito es necesario tener mucha experiencia previa y, aún así, conlleva un tiempo considerable. Por tanto, también proponemos un procedimiento de sintonización eficiente y sistemático que permite a cualquier persona, independientemente de su experiencia previa en sintonización, realizar esta tarea con éxito. Además del aumento de las tasas de transmisión, otros desafíos del sector espacial son reducir el tamaño y peso de sus componentes, así como dotarlos de capacidad dereconfiguración. Emplear dispositivos multifunción como filtros multibanda o dispositivos reconfigurables es una posible solución. En este contexto, proponemos una nueva familia de filtros multibanda en guía de ondas que puede adaptarse a las futuras necesidades del sector espacial. Con el mismo objetivo, también proponemos una familia de dispositivos reconfigurables de varios estados discretos que pueden modificar su comportamiento de forma remota.
[CA] El creixent nombre de dispositius intercanviant dades ha empés a les empreses del sector espacial a utilitzar bandes de freqüència cada vegada més altes, com Ku, K i Ka, ja que permeten fer servir canals de freqüència més amples. A mesura que la longitud d'ona disminueix, la mida dels filtres es redueix i, per tant, són més sensibles a les desviacions de fabricació. Per compensar aquests errors, és necessari fer servir elements de sintonia en l'etapa de disseny. En aquest context presentem una estratègia de disseny que permet incloure tots els factors no ideals, com a elements de sintonia o cantonades arrodonides, en les simulacions finals de filtres i multiplexors. Una vegada s'han fabricat els filtres és necessari ajustar manualment els elements de sintonia fins a recuperar la resposta objectiu. Però, per realitzar aquesta tasca amb èxit és necessari tenir molta experiència prèvia i, així i tot, comporta un temps considerable. Per tant, també proposem un procediment de sintonització eficient i sistemàtic que permet a qualsevol persona, independentment de la seua experiència prèvia en sintonització, realitzar aquesta tasca amb èxit. A més de l'augment de les taxes de transmissió, altres desafiaments de el sector espacial són reduir la mida i pes dels seus components, així com dotar-los de capacitat de reconfiguració. Emprar dispositius multifunció com filtres multibanda o dispositius reconfigurables és una possible solució. En aquest context, proposem una nova família de filtres multibanda en guia d'ones que pot adaptar-se a les futures necessitats del sector espacial. Amb el mateix objectiu, també proposem una família de dispositius reconfigurables de diversos estats discrets que poden modificar el seu comportament de forma remota.
[EN] The need for ever increasing data rate of modern communication systems has motivated companies in the space sector to exploit higher frequency bands, such as Ku, K and Ka, in order to offer wider bandwidths to their customers. However, as the frequency increases, the wavelength decreases, and all waveguide hardware becomes smaller and more sensitive to deviations from the ideal dimensions that normally occur when manufacturing the devices. In order to compensate for these deviations (or errors), tuning elements must then be added to the hardware and included in the design process. In this context, therefore, we focus on the investigation of novel design strategies for filters and multiplexers with the objective of including all necessary non-ideal factors in the design process. It is important to note in this context that, once the filters are manufactured, the tuning elements are usually adjusted manually until the desired target performance has been achieved. However, successfully performing this task requires a considerable amount of time and very significant previous experience in tuning microwave filters. Consequently, an additional goal of our research work is to propose efficient and systematic tuning procedures so that anyone, regardless of their previous tuning experience, can successfully perform this difficult task. In addition to the increasing data rates, another current challenge of advanced communication systems is the ability to be reconfigured remotely to adjust to changes in costumer demands. The use of multi-function or reconfigurable devices is then an attractive possible solution. In this context, therefore, we also investigate new families of multi-band waveguide filters that can be used to accommodate several pass bands in the same filtering device. Furthermore, we also propose a new family of reconfigurable devices with several discrete states that can be easily controlled remotely.
Melgarejo Lermas, JC. (2021). Advanced Techniques for the Design and Optimization of Multi-Band and Reconfigurable Microwave Waveguide Filters [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/172728
TESIS
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Silveira, Taboadela Patricia María. "Systematic Design Methodology for Acoustic Wave Filters Integrated in Multiplexers and Codesigned Modules." Doctoral thesis, Universitat Autònoma de Barcelona, 2021. http://hdl.handle.net/10803/673855.

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Анотація:
El desplegament mundial de la tecnologia 5G i l’ús estès de xarxes sense fils han impulsat un creixement accelerat del nombre de bandes freqüencials requerides pels telèfons intel·ligents i altres dispositius mòbils. De manera simultània, per incrementar la velocitat de connexió, també s’incrementen la complexitat de l’esquema de modulació, el nombre d’antenes i el nombre de portadores agregades. Aquestes especificacions requereixen avenços en la tecnologia de filtres d’RF per assegurar la selecció de la portadora adequada i de tota la informació transmesa. Alhora, dispositius més petits son necessaris en un espai cada cop més reduït i han de suportar nivells de potència més elevats en un escenari d’alta integració. Davant d’aquest desafiament, els ressonadors basats en tecnologia d’ona acústica han demostrat ser la solució que compleix amb els requeriments del mercat. El disseny d’un filtre d’ona acústica ha estat enfocat fins ara des de les tècniques d’optimització que requereixen un procés llarg i costós en termes de computació, una aproximació poc eficient des del punt de vista de la indústria. Però, eines de simulació basades en tècniques avançades de síntesi que consideren les restriccions tecnològiques han estat desenvolupades pel nostre grup en els darrers anys. Aquestes eines proporcionen solucions ràpides i precises com a primer pas per la posterior optimització de l’estructura. El propòsit principal d’aquesta tesi és aconseguir les demandes actuals d’integració de múltiples filtres en un sol mòdul (un multiplexor) i també incloure amplificadors de potència per reduir la mida de les capçaleres d’RF dels dispositius mòbils. En el cas dels multiplexors, el concepte de les xarxes de mínima susceptància ha estat empleat introduint el control de la fase del coeficient de reflexió per classificar aquestes xarxes. Dos escenaris han estat analitzats en quan al pla de freqüències: fixe i flexible. Aquest darrer és un cas complex que es troba impulsat en el paradigma de l’agregació de portadores i els requeriments del mercat. La metodologia proposada garanteix el compliment de les restriccions tecnològiques i dels requeriments d’atenuació de cada canal. En la part de la integració de filtres d’ona acústica en mòduls complets, aquesta tesi adreça la síntesi de filtres considerant impedàncies complexes a la càrrega i a la font. Aquesta proposta permet codissenyar filtres amb xarxes actives o passives permetent eliminar la tradicional etapa intermèdia d’adaptació d’impedàncies. El process de codisseny és il·lustrat amb amplificadors de potència i filtres analitzant les característiques de cara part per assegurar una alta eficiència i una alta potència de sortida en la banda. Alhora, una resposta de filtrat de Chebyshev s’obté en el dispositiu resultant. De la mateixa manera, el control de la fase amb diversos objectius s’ha discutit en aquesta tesi. L’anàlisi teòric queda suportat per exemples simulats i prototips fabricats que demostren la validesa de la hipòtesi. Els resultats aconseguits es troben resumits al final de cada capítol.
La implementación de la tecnología 5G a nivel mundial y el extendido uso de conexiones inalámbricas han impulsado el incremento acelerado del número de bandas de radio frecuencia (RF) que deben ser soportadas por los teléfonos inteligentes y los dispositivos móviles. Al mismo tiempo aumenta la complejidad de los esquemas de modulación, el número de antenas y la cantidad de portadoras con el objetivo de aumentar la velocidad de conexión. Estas demandas requieren avances en la tecnología de filtros de RF que garanticen la selección correcta de cada portadora y la adquisicion íntegra de la información deseada. Sumamos además la necesidad de tener dispositivos cada vez más pequeños en un espacio cada vez más reducido y capaces de manejar mayores potencias en un escenario de alta integración. En este contexto tan desafiante, los filtros basados en resonadores de tecnología microacústica han demostrado ser la solución para cubrir las necesidades del mercado. El diseño de filtros en esta tecnología ha estado dominado por técnicas de optimización que requieren un gran tiempo de procesado y un esfuerzo computacional no eficientes desde el punto de vista industrial. Sin embargo, herramientas de simulación basadas en métodos de síntesis avanzados que consideran los requerimientos propios de la tecnología han sido desarrollados en los últimos años en nuestro grupo de investigación con el objetivo de proporcionar una solución precisa y rápida que sirva de semilla para una posterior optimización. Esta tesis persigue como objetivo dar respuesta a la tendencia actual de integración de múltiples filtros en módulos de RF que incluyen amplificadores de potencia (PA) para disminuir la ocupación dentro de los smartphones. Durante el proceso de diseño de multiplexores he aplicado conceptos con fundamentos teóricos sólidos como las Redes de Mínima Susceptancia y he introducido el control de la fase en el proceso de síntesis como elemento clave en la clasificación de dichas redes de filtrado. Dos posibles escenarios fueron analizados según el plan de frecuencia: fijo y flexible. Este último escenario es especialmente complejo y constituye una demanda industrial reciente debido a la aparición de la tecnología de Carrier Aggregation. La metodología presentada garantiza la viabilidad tecnológica y el cumplimiento de las especificaciones para cada banda de frecuencia. Como parte de la integración en módulos, esta tesis también incluye la síntesis de filtros acústicos con impedancia compleja a la entrada y/o salida. Esta propuesta permite el codiseño de filtros con elementos activos o pasivos para eliminar redes intermedias de adaptacion de impedancia. Se ilustra el proceso de codiseño de amplificadores de potencia y filtros en tecnología microacústica desde un punto de vista integrador para garantizar una alta eficiencia en la conversión de energía y potencias de salida estables en toda la banda de frecuencia. Simultáneamente, una respuesta de filtrado tipo Chebyshev es obtenida en el dispositivo final. El control de la fase con diferentes objetivos es también abordado en este documento. Todos los análisis teóricos han sido acompañados de ejemplos simulados y prototipos fabricados que demuestran la ideoneidad de los planteamientos. Los resultados alcanzados han sido resumidos en cada capítulo.
The worldwide implementation of 5G technology and the extended use of wireless networks have boosted the fast-paced increase in the radio frequency bands number supported by smartphones and other mobile devices. Simultaneously, to increment the connection speed, the modulation scheme complexity, antenna number, and carrier aggregated are increasing. These specifications require advances in the RF filter technology to ensure the proper selection of each carrier and the full information acquisition. Additionally, smaller devices are needed for a shrinking space and also be able to handle higher powers in a highly integrated scenario. In this challenging environment, resonators based on acoustic wave (AW) technology have demonstrated to be the solution for the market requirements. The AW filter design has been driven by optimization techniques that require a time-consuming process and computational efforts, being inefficient from the industry point of view. Nevertheless, simulation tools based on advanced synthesis techniques considering the technological accommodation have been developed in our research group in the last years. These tools provide precise and fast solutions as the first tier for a later optimization procedure. The principal purpose of this thesis is to meet the current demands of integration of multiple filters in one RF module, namely multiplexers, and also including power amplifiers (PA) to reduce the device size inside the smartphones. For the multiplexers design, the Minimum Susceptance Networks (MSN) concept has been exploited, introducing the reflection coefficient phase control as a key element for this kind of network classification. Two probable scenarios were analyzed regarding the frequency plan: fixed and flexible. The latter is a complex case boosted by the advent of the Carrier Aggregation technology and the market requirements. The proposed methodology guarantees technological feasibility and mask specifications fulfillment for each channel. As part of the AW filters module integration, this thesis addresses the synthesis considering complex source/load impedances. The proposal allows the co-design of filters with active or passive networks removing the common inter-stage matching network. It is illustrated the co-design process for power amplifiers and filters analyzing each part's features to ensure high efficiency and output power in the passband. Simultaneously, a Chebyshev filter response is obtained in the resulting device. Moreover, the phase control with different purposes is also discussed in this document. The theoretical analysis has been supported by simulated examples and manufacturing prototypes that show the approach's pertinence. The achieving results have been summarized at each chapter's end.
Universitat Autònoma de Barcelona. Programa de Doctorat en Enginyeria Electrònica i de Telecomunicació
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9

El-Feghi, Idris S. "Design of three-dimensional digital filters." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0013/MQ52542.pdf.

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Wicks, Tony. "Design and implementation of PCAS filters." Thesis, University of Warwick, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308510.

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Книги з теми "Filters’ design"

1

Van Valkenburg, M. E. 1921- and Van Valkenburg, M. E. 1921-, eds. Design of analog filters. New York: Oxford University Press, 2001.

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2

1940-, Taylor Fred J., ed. Electronic filter design handbook: LC, active, and digital filters. 2nd ed. New York: McGraw-Hill, 1988.

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Active filters: Theory and design. Boca Raton: CRC Press, 2008.

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4

Schlichthärle, Dietrich. Digital Filters: Basics and Design. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2011.

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5

Schlichthärle, Dietrich. Digital Filters: Basics and Design. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000.

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6

Filter design. Oxford, [England]: Newnes, 1997.

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7

Anderson, Martin S. Design of two-dimensional PCAS digital filters and filter banks. [s.l.]: typescript, 1994.

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Jean-Claude, Berka, ed. Active RC filter design. Amsterdam: Elsevier, 1986.

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9

Roger, Harrison, ed. Practical filter design. New York: Prentice Hall, 1993.

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10

Yichuang, Sun, and Fidler J. K, eds. Continuous-time active filter design. Boca Raton, Fla: CRC Press, 1999.

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Частини книг з теми "Filters’ design"

1

Self, Douglas. "Filters." In Small Signal Audio Design, 179–92. Third edition. | Abingdon, Oxon ; New York, NY : Routledge, 2020.: Focal Press, 2020. http://dx.doi.org/10.4324/9781003031833-6.

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Schlichthärle, Dietrich. "Design of IIR Filters." In Digital Filters, 259–328. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-14325-0_6.

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Schlichthärle, Dietrich. "Design of FIR Filters." In Digital Filters, 329–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-14325-0_7.

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Schlichthärle, Dietrich. "Design of IIR Filters." In Digital Filters, 141–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-04170-3_6.

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Schlichthärle, Dietrich. "Design of FIR Filters." In Digital Filters, 177–225. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-04170-3_7.

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6

Fluke, John C. "Filters." In Controlling Conducted Emissions by Design, 105–32. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-7024-6_6.

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Marković, Dejan, Robert W. Brodersen, Rashmi Nanda, and Borivoje Nikolić. "Digital Filters." In DSP Architecture Design Essentials, 111–43. Boston, MA: Springer US, 2012. http://dx.doi.org/10.1007/978-1-4419-9660-2_7.

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Dimopoulos, Hercules G. "Some Filter Design Mathematics." In Analog Electronic Filters, 441–64. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-2190-6_11.

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Litovski, Vančo. "Introduction to the RM Software for Filter Design." In Electronic Filters, 75–98. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9852-1_5.

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Khoury, John M. "Transconductor — C Filters." In Analog Circuit Design, 167–86. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4757-2353-3_9.

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Тези доповідей конференцій з теми "Filters’ design"

1

Greenlee, Alison, Timothy Murray, Victor Lesniewski, Mark Jeunnette, and Amos G. Winter. "Design and Testing of a Low-Cost and Low-Maintenance Drip Irrigation Filtration System for Micro-Irrigation in Developing Countries." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-35351.

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The cylindrical filters presently used in <1000 m2 drip irrigation systems are frequently clogged, increasing pressure loss and lowering the flow rate through the filters. This work investigates the mechanisms for this clogging and proposes an alternative filtration design that would enable both more reliable and lower maintenance filtering. This proposed system is compatible with existing drip irrigation systems and could be made inexpensively with plastic bottle manufacturing equipment. To compare the proposed design to off-the-shelf options, a drip irrigation test setup was built to measure the pressure loss across different filters as particles accumulated. These experiments confirmed that pleated cartridge filters, with high effective surface area, incurred lower pressure losses than cylindrical filters. These tests revealed that the greatest reason for clogged performance was that filtered particles (not the cartridge filter itself) eventually restricted the flow of water through the system. This inspired the redesign of the filter housing such that the housing extended far below the filter, providing a catch basin away from the filter for the particles to settle. Fixing the filter independently of the bottom casing significantly improved the overall performance of the filtration system, reduced the maintenance requirement necessary from the user, and would enable inexpensive manufacturing via blow molding. This paper experimentally demonstrates that the cartridge filter inside the redesigned housing can filter out over 2 kg of sand while maintaining less than a .03 bar pressure drop across the filter at a flow rate of 25 l/s.
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Economou, D., C. Mavroidis, and I. Antoniadis. "Comparison of Robust Residual Vibration Suppression Capabilities of Conventional Digital Filters." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21472.

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Abstract Digital filters consist a quite effective robust residual vibration tool, when they are used for preconditioning any excitation function, prior to its application in a flexible system. Since a quite large number of conventional digital filters already exist, each one obtained by a different design procedure and resulting to different characteristics, a systematic comparison of their capabilities is performed. Critical design parameters are addressed, influencing the filter behavior in vibration suppression, such as the total delay introduced by the filter, the permitted residual vibration error, the robustness degree achieved and the necessary computational requirements in their implementation. It is shown, that although mere does not exist a single type of filter, simultaneously conforming to an optimal degree to all the design requirements, a large variety of conventional filters can be effectively used for the several individual residual vibration suppression requirements.
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3

Walker, J. L. B. "Filters." In IEE Colloquium on How to Design RF Circuits. IEE, 2000. http://dx.doi.org/10.1049/ic:20000144.

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Vaubert, Virginie, David P. Stinton, Chris Barra, and Santosh Limaye. "Design and Initial Development of Monolithic Cross-Flow Ceramic Hot-Gas Filters." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-320.

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Advanced, coal-fueled, power generation systems utilizing pressurized fluidized bed combustion (PFBC) and integrated gasification combined cycle (IGCC) technologies are currently being developed for high-efficiency, low emissions, and low-cost power generation. In spite of the advantages of these promising technologies, the severe operating environment often leads to material degradation and loss of performance in the barrier filters used for particle entrapment. To address this problem, LoTEC Inc., and Oak Ridge National Laboratory are jointly designing and developing a monolithic cross-flow ceramic hot-gas filter. The filter concept involves a truly monolithic cross-flow design that is resistant to delamination, can be easily fabricated, and offers flexibility of geometry and material make-up. During Phase I of the program, a thermo-mechanical analysis was performed to determine how a cross-flow filter would respond both thermally and mechanically to a series of thermal and mechanical loads. The cross-flow filter mold was designed accordingly, and the materials selection was narrowed down to Ca0.5Sr0.5Zr4P6O24 (CS-50) and 2Al2O3−3SiO2 (mullite). A fabrication process was developed using gelcasting technology and monolithic cross-flow filters were fabricated. The program focuses on obtaining optimum filter permeability and testing the corrosion resistance of the candidate materials.
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Zeng, Yi, and Ming Yu. "Design Advanced Microwave Filters with Redundancy." In 2021 IEEE MTT-S International Microwave Filter Workshop (IMFW). IEEE, 2021. http://dx.doi.org/10.1109/imfw49589.2021.9642371.

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Wang, Jun, W. Chen, and Anand K. Asundi. "Strain contouring using Gabor filters: filter bank design." In Third International Conference on Experimental Mechanics, edited by Xiaoping Wu, Yuwen Qin, Jing Fang, and Jingtang Ke. SPIE, 2002. http://dx.doi.org/10.1117/12.468859.

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Al-Hashimi, B. "Current mode filters: design, simulation and implementation." In IEE 15th SARAGA Colloquium on Digital and Analogue Filters and Filtering Systems. IEE, 1995. http://dx.doi.org/10.1049/ic:19951450.

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Somerset, W. P. "Computer aided design of digital Nyquist filters." In IEE 15th SARAGA Colloquium on Digital and Analogue Filters and Filtering Systems. IEE, 1995. http://dx.doi.org/10.1049/ic:19951461.

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Weiss, S., M. Harteneck, and R. W. Stewart. "On implementation and design of filter banks for subband adaptive systems." In IEE Colloquium on Digital Filters: An Enabling Technology. IEE, 1998. http://dx.doi.org/10.1049/ic:19980295.

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Economou, D., C. Mavroidis, and I. Antoniadis. "Proper Filter Design Procedure for Vibration Suppression Using Delay-Error-Order Curves." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/dsc-24614.

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Abstract Vibration suppression can be performed by digital filtering the input to the flexible system. Traditional digital filters have been proved to be efficient for vibration suppression, when they are properly designed. In order to ensure the proper filter design, the Delay-Error-Order (DEO) curves are introduced, to be used as a filter design tool. Based on the DEO curves, the vibration suppression properties and capabilities of the filter can be related with the design parameters involved in the traditional filter design methods. Using the DEO curves, the filters designed by means of conventional design methods posses excellent vibration suppression capabilities. This design procedure is presented in detail in this paper and an example of the application of the method is included.
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Звіти організацій з теми "Filters’ design"

1

Humblet, Pierre A. Design of Optical Matched Filters. Fort Belvoir, VA: Defense Technical Information Center, March 1991. http://dx.doi.org/10.21236/ada459249.

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Vaidyanathan, P. P., and Ahmet Kirac. Theory and Design of Optimum Fir Compaction Filters,. Fort Belvoir, VA: Defense Technical Information Center, January 1996. http://dx.doi.org/10.21236/ada323658.

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Kirac, Ahmet, and P. P. Vaidyanathan. FIR Compaction Filters: New Design Methods and Properties,. Fort Belvoir, VA: Defense Technical Information Center, April 1997. http://dx.doi.org/10.21236/ada324480.

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4

Hutchins, J. A., and R. W. Simons. Enhanced Internet firewall design using stateful filters final report. Office of Scientific and Technical Information (OSTI), August 1997. http://dx.doi.org/10.2172/554820.

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Kallman, Robert R. The Design of Phase-Only Filters for Optical Correlations. Fort Belvoir, VA: Defense Technical Information Center, July 1990. http://dx.doi.org/10.21236/ada225641.

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Deibele, C., and /Fermilab. Design of Microwave Band Pass Filters for the Debuncher Stochastic Cooling System. Office of Scientific and Technical Information (OSTI), January 2001. http://dx.doi.org/10.2172/984584.

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Xiao, Haiqiao. Design of Radio-Frequency Filters and Oscillators in Deep-Submicron CMOS Technology. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.7106.

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Kirac, Ahmet, and P. P. Vaidyanathan. Efficient Design Methods of Optimal FIR Compaction Filters for M-channel FIR Subband Coders,. Fort Belvoir, VA: Defense Technical Information Center, November 1996. http://dx.doi.org/10.21236/ada327786.

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Bergman, W., M. W. First, W. L. Anderson, H. Gilbert, and J. W. Jacox. Criteria for calculating the efficiency of deep-pleated HEPA filters with aluminum separators during and after design basis accidents. Office of Scientific and Technical Information (OSTI), February 1995. http://dx.doi.org/10.2172/71317.

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Bergman, W., M. W. First, and W. L. Anderson. Criteria for calculating the efficiency of deep-pleated HEPA filters with aluminum separators during and after design basis accidents. Office of Scientific and Technical Information (OSTI), February 1995. http://dx.doi.org/10.2172/95682.

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