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Добірка наукової літератури з теми "BAND APSS FILTER"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "BAND APSS FILTER"

Ehtesham, Mohammad, and Md Junaid. "Advanced compensation scheme for enhancing photovoltaic power quality." Indonesian Journal of Electrical Engineering and Computer Science 27, no. 3 (September 1, 2022): 1223. http://dx.doi.org/10.11591/ijeecs.v27.i3.pp1223-1230.

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With the photovoltaic (PV) system becoming highly popular in distribution network, there is also a growing concern regarding its adverse impacts over the power quality (PQ) of integrated system. This deterioration in PQ hassparked a new interest in the filtering techniques used in the power systemfor mitigating these problems. In contrast to conventional passive filters now active power filters (APFs) are being looked as the predominant solution.This paper presents a state-estimation based effective compensation strategy for enhancing performance of employed APF scheme. A novel control technique for PQ enhancement is proposed where Kalman filtering approach has been applied for generating the reference signals. Also, an adaptive hysteresis band technique has been applied here in the switching strategy. Thus an enhanced filter performance is achieved with reduced complexity and better elimination of distortions. Simulated results obtained in MATLAB/Simulink platform have been analyzed completely, where the superiority of filtering algorithm has been also demonstrated through leasttotal harmonic distortion (THD) achieved in source current among all the existing Kalman filters.

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Sun, Shu-Peng, Yong-Zhi Cheng, Hui Luo, Fu Chen, and Xiang-Cheng Li. "Compact broadband bandpass filter with wide stopband based on halberd-shaped spoof surface plasmon polariton." Acta Physica Sinica 72, no. 6 (2023): 064101. http://dx.doi.org/10.7498/aps.72.20222291.

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In this paper, a compact broadband bandpass filter with wide out-of-band rejection characteristics based on halberd-shaped spoof surface plasmon polariton (SSPP) is proposed. The filtering structure is achieved by etching a periodic halberd-shaped groove at the bottom of the substrate and a microstrip-to-slot line transition with a crescent-shaped patch at the top. Compared with the traditional dumbbell-shaped SSPP, the halberd-shaped SSPP has good slow-wave property, and the designed bandpass filter based on halberd-shaped SSPP can achieve a more compact size. The upper cutoff frequency and lower cutoff frequency of the passband can be adjusted by regulating the SSPP structure and the transition structure from microstrip-to-slot line, respectively. The simulation results show that the center frequency of broadband bandpass filter is 2.85 GHz, with the relative bandwidth of 130%, and the return loss in the passband is better than –10 dB, and the extreme strong out-of-band rejection of –40 dB from 5.6 GHz to 20 GHz. The size of the broadband bandpass filter is compact, only 1.08λg×0.39λg, where λg is the wavelength at the center frequency. In order to verify the effectiveness of the wideband bandpass filter, the traditional printed circuit board technology is used to fabricate the wideband bandpass filter. The measurement results are in good agreement with the simulation results, verifying the feasibility of the design. The proposed broadband bandpass filter shows promising prospects for developing SSPP functional devices and circuits at microwave frequencies.

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Wang Wu-Song, Zhang Li-Wei, Ran Jia, and Zhang Ye-Wen. "Experimental studies of the surface plasmon polaritons waveguide filter in microwave band." Acta Physica Sinica 62, no. 18 (2013): 184203. http://dx.doi.org/10.7498/aps.62.184203.

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Teng Chen-Chen, Zhou Wen, Zhuang Yu-Yang, and Chen He-Ming. "Low loss and narrow-band THz filter based on magnetic photonic crystals." Acta Physica Sinica 65, no. 2 (2016): 024210. http://dx.doi.org/10.7498/aps.65.024210.

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Tian, Ying, Wu-Hao Cai, Zi-Xiang Yang, Feng Chen, Rui-Bo Jin, and Qiang Zhou. "Hong-Ou-Mandel interference of entangled photons generated under pump-tight-focusing condition." Acta Physica Sinica 71, no. 5 (2022): 054201. http://dx.doi.org/10.7498/aps.71.20211783.

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Hong-Ou-Mandel (HOM) interference is a non-classical effect of photons and plays an important role in quantum optics. The β-barium borate (BBO) has a high nonlinear efficiency, and is commonly used to generate biphoton states, thereby exhibiting HOM interference. However, in previous experiments, researchers often used band-pass filters, so the resulting spectrum was directly determined by the band-pass filter. As a result, the original spectrum of the BBO crystal, especially the spectrum under tight focusing, was lack of systematic research. In this paper, the biphoton spectral distribution and HOM interference generated by the BBO crystal under the condition of tight focusing are systematically studied for the first time. Theoretical calculations show that using a lens with 50-mm focusing length, the spectral width of the down-converted photons is increased by 7.9 times that of the non-focused case; the width of the HOM interference fringe is reduced to 1/8, and the visibility of the interference fringe increases from 53.0% to 98.7%. We experimentally prepare the energy-time entanglement state by using type-II BBO crystal and perform HOM interference, thereby obtaining the interference visibility of <inline-formula><tex-math id="M2">\begin{document}$(86.6 \pm 1.0)$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="5-20211783_M2.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="5-20211783_M2.png"/></alternatives></inline-formula>%. The increasing of the HOM visibility is due to the improvement of biphoton's spectral symmetry. In addition, the proposed technique by which different spectral distributions are obtained at different incident angles is expected to be applied to the preparation of high-dimensional qudits in the future.

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Cui Guang-Bin, Miao Jun-Gang, and Zhang Yong-Fang. "Design of waveguide array frequency selective surface filter in sub-millimeter wave band." Acta Physica Sinica 61, no. 22 (2012): 224102. http://dx.doi.org/10.7498/aps.61.224102.

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Zhao, Shu-Yu, Bin-Bin Xu, Zhen-Yu Zhao, and Xue-Qin Lü. "Influence of top mirror on performance of GaN-based resonant cavity light-emitting diode." Acta Physica Sinica 71, no. 4 (2022): 047801. http://dx.doi.org/10.7498/aps.71.20211720.

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In this paper, two kinds of distributed Bragg reflectors (DBRs) with high-reflective-film structure and filter structure are designed and evaporated on the top of GaN-based resonant cavity light emitting diode (RCLED), respectively. Firstly, the reflectivity spectra of the two kinds of DBRs are simulated. Then, the differences in performance including optical longitudinal modes, spectral linewidth, and output light intensity between the two kinds of RCLED devices with different top mirrors, are compared and analyzed. Finally, the influence of the top mirror reflection characteristics on the output spectrum of the RCLED is studied in detail. The results show that the top mirror is an important part of RCLED, and its reflection characteristics determine the optical performance of the device. For the conventional DBR with high-reflective-film structure, its reflectivity spectrum has a wide high-reflection band. Accordingly, the spectral linewidth of the RCLED can be effectively narrowed by using the conventional DBR as the top mirror. However, the spectrum still consists of multi-longitudinal modes. For the DBR with filter structure, its reflectivity spectrum has a narrow high-transmittance band at the central wavelength. Depending on the modulation effect of the high-transmittance band to the output light, single longitudinal mode light emission is realized for the RCLED with the specially designed DBR as the top mirror, which shows a broad application prospect in optical communication and optical fiber sensing. Moreover, the spectral characteristics of the RCLED can be further optimized to meet its application requirements in much more fields, by designing the top mirror structure and changing its reflectivity spectrum characteristics.

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Ning, Ren-Xia, Wang Huang, Fei Wang, Jian Sun, and Zheng Jiao. "Electromagnetic induction-like transparency in dual-band with dual-bright mode coupling." Acta Physica Sinica 71, no. 1 (2022): 014201. http://dx.doi.org/10.7498/aps.71.20211312.

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In this paper, a metamaterial structure with a double-layer split square ring and a double C-shaped structure is designed, which has dual-band electromagnetically induced transparency effects in the terahertz band. This structure has transmission peaks at 1.438 THz and 1.699 THz. Through the analysis of the surface current distribution, the reasons for the dual-band electromagnetically induced transparency are discussed. The effect of the designed metamaterial on the transmission window is studied when the opening size of the open square ring and the distance of the double C-shaped structure and the incident angle are changed. At an incident angle, the transmission spectrum of the designed material changes greatly, implying that it is highly sensitive to angle. The research results show that the structure has potential applications in sensors and angle filters.

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Zhou, Chang, Rui Gong, and Xiao-Bo Feng. "Theoretical studies on optical absorption in twisted bilayer graphene under vertical electric field." Acta Physica Sinica 71, no. 5 (2022): 054203. http://dx.doi.org/10.7498/aps.71.20211406.

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The interlayer twist angle is an important parameter that can tune the physical properties of graphene in a wide wavelength range. In this paper, we employ an effective continuum model to calculate the band structure of twisted bilayer graphene with different twist angles in the presence and absence of vertical electric field. Based on the transition rate of the electron-photon interaction, we calculate and simulate the optical absorption spectra caused by the interband and intraband transitions around the van Hove singularities. The calculation results show that the optical absorption caused by the interband transitions occurs in the wavelength range from visible light to near-infrared while it appears in far-infrared for intraband transitions. The optical absorption coefficient of the intra-band transitions is almost two orders of magnitude larger than that of inter-band transitions. In the absence of an external electric field, as the twist angle increases, the absorption peak of the inter band transition moves from the infrared light band to the visible light band, but the resonant peak position of its intra-band transition does not change. At the same time, the absorption coefficient values corresponding to the above two transitions will increase. When an electric field is applied perpendicular to the twisted bilayer graphene, the symmetry of the initial band structure of bilayer graphene is destroyed, which results in the splitting of the absorption peaks associated the with interband transitions, and the distance between the two splitting peaks increases with the electric field intensity increasing; while the position and amplitude of the absorption peak associated with the intraband transition are completely unaffected by the applied electric field. The theoretical calculation results in this paper can provide the theoretical guidance for further applying twisted graphene to optoelectronic devices such as tunable dual-band filters.

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Huang Xi, Zhang Xin-Liang, Dong Jian-Ji, Zhang Yu, and Huang De-Xiu. "Theoretical study on non-inverted wavelength conversion based on semiconductor optical amplifier and optical band-pass filter." Acta Physica Sinica 59, no. 2 (2010): 1021. http://dx.doi.org/10.7498/aps.59.1021.

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Дисертації з теми "BAND APSS FILTER"

Degerli, Yavuz. "Étude, modélisation des bruits et conception des circuits de lecture dans les capteurs d'images à pixels actifs CMOS." École nationale supérieure de l'aéronautique et de l'espace (Toulouse ; 1972-2007), 2000. http://www.theses.fr/2000ESAE0009.

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Ce travail porte sur l'amélioration des performances en bruit et sur la conception de circuits de lecture de capteurs d'images à pixels actifs CMOS à destination des applications scientifiques. La première partie est consacrée à l'étude et à la modélisation du bruit temporel de la chaîne de lecture du capteur. Cette étude nous permet de définir des règles de conception réduisant le bruit de ces circuits. Des circuits de test ont été réalisés sur une technologie CMOS 0. 7µm, afin de valider les résultats obtenus. Le deuxième axe porte sur la conception de circuits analogiques de lecture et de traitement du signal effectuant l'extraction du signal utile, l'amplification, et la correction de bruit spatial fixe de colonnes, intégrés sur la même puce que la matrice photosensible ainsi que l'analyse de leurs performances. Trois circuits ont été réalisés sur une technologie CMOS 0. 7µm : le premier est un amplificateur à capacités commutées (c. C. ) élémentaire, le second un amplificateur à c. C. à compensation de la tension de décalage, et le troisième un filtre passe-bande actif commutable. Ils permettent des vitesses de lecture jusqu'à 10Mpixel/sec. Une analyse théorique détaillée de la réponse des circuits au bruit blanc et au bruit en 1/f[exposant α], en considérant la nature non-stationnaire des signaux de sortie, est présentée. Les résultats expérimentaux et théoriques sont comparés. Finalement un nouveau circuit de lecture du signal des colonnes est proposé et développé afin de réduire le bruit spatial fixe de colonnes. Il nécessite un seul amplificateur de colonne commun à toute une matrice de pixels. Les effets des non-idéalités des composants réels sur les performances de ce circuit sont étudiés et des solutions sont proposées et discutées afin de les minimiser. Les résultats expérimentaux ainsi que les problèmes rencontrés sur un circuit de test, comprenant 128x128 pixels et réalisé sur une technologie CMOS 0. 6µm, sont présentés.

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AWASTHI, SHRUTI. "DESIGN AND IMPLEMENTATION OF BANDPASS FILTER USING PARALLEL COUPLED RESONATOR." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14814.

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Band-pass filters play a vital role in wireless communication systems. Transmitted and received signals have to be filtered at a certain centre frequency with a specific bandwidth. Band-pass filters are used as frequency selective component in many RF and Microwave applications. There are several applications of a band-pass filter, for instance, at the receiver end it is used to eliminate the image frequency and to bandlimit the received signal. In the transmitter, they are used to reject the spurious signals generated by the local oscillator (LO). This project deals with the analysis, design, simulation, fabrication and testing of parallel coupled band-pass filter. Advanced Design System (ADS) 2011.10 Software is used for mathematical calculations and simulations. The filter is designed at the centre frequency 2.4 GHz using FR-4 as a substrate.

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Частини книг з теми "BAND APSS FILTER"

Sarkar, Nurul I., Anita Xiao-min Kuang, Kashif Nisar, and Angela Amphawan. "Hospital Environment Scenarios using WLAN over OPNET Simulation Tool." In Healthcare Administration, 789–804. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-6339-8.ch040.

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For the past ten years, heterogeneous networks wired and wireless had tended to integrate seamlessly, offering effective and reliable service for medical operations. One of the problems encountered by network practitioners is the seamless integration of network components into healthcare delivery. As a multiplexing hospital model, the implementation certainly presents some challenges. The major technical and performance issues involve are as following. The operating parameters should keep aligned to the Quality of Service (QoS) requirement throughout simulation. Bandwidth utilisation of wireless networking is a challenging issue for real-time multimedia transmission. IEEE 802.11 provides relatively lower data rate than wired networks, thus the developer tends to adopt a more compromised solution: either reduce the file size or compress the image packets. Communication performance that varies constantly with the impact of signal strength, traffic load and interference. As stated radio signal senses as a curve and attenuates greatly while metallic object and microwave exist within the active range. To ensure devices do not interfere with other electronic equipments (e.g. heart monitors), assert wireless spectrum has to be managed appropriately. This research paper aims to develop a generic hospital network scenarios using Wireless Local Area Network (WLAN) over OPNET Simulation, to evaluate the performance of the integrated network scenario for Intensive Care Units (ICU). This research makes use of computer simulation and discusses various aspects of the network design, so as to discover the performance behaviour pertaining to effect of traffic type, traffic load and network size. In the ICU scenario, the performance of video conference degrades with network size, thus, a QoS-enabled device is recommended to reduce the packet delay and data loss. IEEE 802.11a suits in hospital environment because it mitigates interference on the 2.4GHz band where most wireless devices operate. Experiment examines the effect of signal strength in WLAN. It is convinced that -88dBm is the best signal strength threshold. Although 802.11a generates slightly lower throughput than 802.11g, this issues can be addressed by placing more APs in the service area. It is convinced that 802.11a suits the hospital environments, because it mitigates interference on the popular 2.4GHz band where most wireless devices operate. It is important for medical devices which require future upgrade and Bluetooth deployment.

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Тези доповідей конференцій з теми "BAND APSS FILTER"

Ghasemzadeh, Pejman, Michael Hempel, Hamid Sharif, and Tarek Omar. "Maximizing RF Communications Throughput for Railroad Applications at 160 MHz." In 2022 Joint Rail Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/jrc2022-79575.

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Abstract As the railroad industry in North America pursues the further expansion of their wireless communications capabilities in support of many different railroad applications, such as Positive Train Control and wireless wayside monitoring, it faces a critical challenge due to the rapidly worsening congestion and over-utilization of RF spectrum resources. Thus, the rail industry is exploring the use of underutilized non-traditional RF bands. One such example is the 160 MHz RF band. In this paper we present initial results from our comprehensive evaluation and RF solutions design effort for the 160 MHz band, with the aim of maximizing communications throughput while complying with current regulatory requirements such as channelization and emission mask regulations. Accomplishing this investigation involves capturing and evaluating all parameters impacting the signal and its spectral characteristics, such as sampling rate and the root-raised-cosine filter parameters (roll-off, filter span, etc.), in order to adhere to channel width mandates and avoid adjacent channel interference. Our results assist with formulating bit rate and symbol rate selections to maximize performance within FCC-mandated spectral mask requirements for this RF band. For our comprehensive investigation we evaluated signals modulated using QAM, Mil188QAM, APSK, DVB-S2/S2X/SH-APSK, PSK and PAM, with different modulation orders ranging from 2 to 256. We then further expanded our work by considering Orthogonal Frequency Division Multiplexing (OFDM) and its corresponding parameters, e.g., FFT size, cyclic prefix, guard bands and more. This research is designed to pave the way to enable vital rail applications for non-traditional RF bands, or expand critical applications such as Positive Train Control into bands such as 160 MHz.

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Zamudio, M. E., Y. Tawk, C. G. Christodoulou, and J. Costantine. "Embedding a reconfigurable band-pass/band-stop filter into an antenna." In 2012 IEEE Antennas and Propagation Society International Symposium and USNC/URSI National Radio Science Meeting. IEEE, 2012. http://dx.doi.org/10.1109/aps.2012.6348463.

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Yohannan, J., V. Hamsakutty, A. V. P. Kumar, V. Thomas, G. Bindhu, and K. T. Mathew. "A Rectangular Dielectric Resonator Band Stop Filter." In 2006 IEEE Antennas and Propagation Society International Symposium. IEEE, 2006. http://dx.doi.org/10.1109/aps.2006.1711359.

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Wang, J. P., Y. X. Guo, B. Z. Wang, L. C. Ong, and S. Q. Xiao. "Dual-band microstrip stepped-impedance bandpass filter." In 2007 IEEE Antennas and Propagation Society International Symposium. IEEE, 2007. http://dx.doi.org/10.1109/aps.2007.4396199.

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Wang, H. Y., and H. Zhou. "A multi-band loop antenna with a band stop filter for wireless handheld devices." In 2017 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC). IEEE, 2017. http://dx.doi.org/10.1109/apwc.2017.8062261.

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Reid, J. R., and R. T. Webster. "A compact integrated coaxial V-band bandpass filter." In IEEE Antennas and Propagation Society Symposium, 2004. IEEE, 2004. http://dx.doi.org/10.1109/aps.2004.1329839.

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Zayniyev, D., and D. Budimir. "Dual-band microstrip antenna filter for wireless communications." In 2010 IEEE International Symposium Antennas and Propagation and CNC-USNC/URSI Radio Science Meeting. IEEE, 2010. http://dx.doi.org/10.1109/aps.2010.5561046.

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Sanphuang, Varittha, Niru K. Nahar, and John L. Volakis. "Novel FSS filters in Ka band." In 2012 IEEE Antennas and Propagation Society International Symposium and USNC/URSI National Radio Science Meeting. IEEE, 2012. http://dx.doi.org/10.1109/aps.2012.6348716.

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Sohail, Irfan, Yogesh Ranga, Karu P. Esselle, Ladislau Matekovits, and Stuart G. Hay. "Ultra-wide band frequency selective surface filter designed for Ku- and K- band applications." In 2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2013. http://dx.doi.org/10.1109/aps.2013.6710899.

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Ghaed, Mohammad, Dennis Sylvester, and David Blaauw. "A dual-passband filter architecture for dual-band systems." In 2011 IEEE Antennas and Propagation Society International Symposium and USNC/URSI National Radio Science Meeting. IEEE, 2011. http://dx.doi.org/10.1109/aps.2011.6222776.

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