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Artigos de revistas sobre o tema "Superdirective array"

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Autor: Grafiati

Publicado: 7 de julho de 2024

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1

Altshuler, E. E., T. H. O'Donnell, A. D. Yaghjian e S. R. Best. "A monopole superdirective array". IEEE Transactions on Antennas and Propagation 53, n.º 8 (agosto de 2005): 2653–61. http://dx.doi.org/10.1109/tap.2005.851810.

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2

Nakamura, Takashi, Shin-Ichi Miyagawa e Senji Yckokawa. "Superdirective cascaded dipole array". Electronics and Communications in Japan (Part I: Communications) 75, n.º 11 (1992): 80–88. http://dx.doi.org/10.1002/ecja.4410751108.

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3

Lonsky, Tomas, Jan Kracek e Pavel Hazdra. "Superdirective Linear Dipole Array Optimization". IEEE Antennas and Wireless Propagation Letters 19, n.º 6 (junho de 2020): 902–6. http://dx.doi.org/10.1109/lawp.2020.2981533.

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4

Buell, Kevin, Hossein Mosallaei e Kamal Sarabandi. "Metamaterial Insulator Enabled Superdirective Array". IEEE Transactions on Antennas and Propagation 55, n.º 4 (abril de 2007): 1074–85. http://dx.doi.org/10.1109/tap.2007.893373.

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5

Haskou, Abdullah, Ala Sharaiha e Sylvain Collardey. "Compact Antenna Array of Superdirective Elements". IEEE Antennas and Wireless Propagation Letters 15 (2016): 1386–89. http://dx.doi.org/10.1109/lawp.2015.2510382.

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6

Best, S. R., E. E. Altshuler, A. D. Yaghjian, J. M. McGinthy e T. H. O'Donnell. "An Impedance-Matched 2-Element Superdirective Array". IEEE Antennas and Wireless Propagation Letters 7 (2008): 302–5. http://dx.doi.org/10.1109/lawp.2008.921372.

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7

Simón Gálvez, Marcos F., Stephen J. Elliott e Jordan Cheer. "A superdirective array of phase shift sources". Journal of the Acoustical Society of America 132, n.º 2 (agosto de 2012): 746–56. http://dx.doi.org/10.1121/1.4733556.

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8

Andrasic, G., e J. R. James. "Height reduced superdirective array with helical directors". Electronics Letters 29, n.º 23 (1993): 2002. http://dx.doi.org/10.1049/el:19931335.

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9

Bokhari, S. A., H. K. Smith, J. R. Mosig, J. F. Zürcher e F. E. Gardiol. "Superdirective antenna array of printed parasitic elements". Electronics Letters 28, n.º 14 (1992): 1332. http://dx.doi.org/10.1049/el:19920846.

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10

Greco, Danilo, e Andrea Trucco. "Superdirective Robust Algorithms’ Comparison for Linear Arrays". Acoustics 2, n.º 3 (22 de setembro de 2020): 707–18. http://dx.doi.org/10.3390/acoustics2030038.

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Frequency-invariant beam patterns are often required by systems using an array of sensors to process broadband signals. In some experimental conditions (small devices for underwater acoustic communication), the array spatial aperture is shorter than the involved wavelengths. In these conditions, superdirective beamforming is essential for an efficient system. We present a comparison between two methods that deal with a data-independent beamformer based on a filter-and-sum structure. Both methods (the first one numerical, the second one analytic) formulate a mathematical convex minimization problem, in which the variables to be optimized are the filters coefficients or frequency responses. The goal of the optimization is to obtain a frequency invariant superdirective beamforming with a tunable tradeoff between directivity and frequency-invariance. We compare pros and cons of both methods measured through quantitative metrics to wrap up conclusions and further proposed investigations.

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11

Hu, Ruoyu, Yingqiang Wang, Wencheng Yang, Ying Chen e S. H. Huang. "Fast Calibration of Superdirective Ultra-Short Baseline Array". Journal of Marine Science and Engineering 11, n.º 9 (24 de agosto de 2023): 1665. http://dx.doi.org/10.3390/jmse11091665.

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Array calibration can effectively ensure the positioning accuracy of the ultra-short baseline (USBL) system. Traditional USBL array calibration methods focus on measuring the geometric position of the array elements. However, directional phase differences on the receive path are often ignored in the current calibration process, which can also cause array mismatch, especially when using the superdirective beamforming (SDB) technique. To further improve the calibration accuracy and convenience of the USBL using the SDB technique, a fast calibration method is proposed in this paper. In the new method, the hydrophone geometry error and the receiver path phase error are jointly considered. Then, two calibration models with different complexity are presented, and the conventional beamforming (CBF) beam output is deconvoluted with the calibrated beam pattern. The results of anechoic tank experiments show that the bearing root mean square error (RMSE) can be reduced from 1.663° to 0.081°, and the calibration time can be reduced from hours to tens of minutes.

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12

Humphrey, Victor F., Paul C. Hines e Victor Young. "Experimental performance analysis of a superdirective line array". Journal of the Acoustical Society of America 114, n.º 4 (outubro de 2003): 2426. http://dx.doi.org/10.1121/1.4778860.

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13

Chaloupka, H. J., X. Wang e J. C. Coetzee. "A superdirective 3-element array for adaptive beamforming". Microwave and Optical Technology Letters 36, n.º 6 (14 de fevereiro de 2003): 425–30. http://dx.doi.org/10.1002/mop.10782.

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14

Dakhli, Saber, Jean Marie Floc’h, Mohammed Aseeri, Ameni Mersani e Hatem Rmili. "Design of Compact and Superdirective Metamaterial-Inspired Two- and Three-Elements Antenna Arrays". Journal of Electromagnetic Engineering and Science 23, n.º 4 (31 de julho de 2023): 362–68. http://dx.doi.org/10.26866/jees.2023.4.r.179.

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This paper presents the development of a miniature antenna array in a small space in order to achieve superdirectivity for long-range communication. The proposed structures consist of a superdirective metamaterial-inspired array based on a capacitively loaded loop (CLL) driven by an electrically small monopole antenna. This elementary antenna is then used in two- and three-array configurations separated by a fixed interelement distance of 0.1λ to achieve a higher directivity and compact size (with λ the wavelength calculated at the operation frequency 1.850 GHz). The design of the elementary antenna, its simulated radiation performances, as well as those of the parasitic array are also reported. The results of the optimization of two- and three-antenna arrays are discussed. For this study, three corresponding prototypes were fabricated and tested. The measured impedance mismatch and radiation pattern results are presented and shown to be in good agreement with their simulated values. The maximum measured directivity is equal to 5.9 dBi and 4.75 dBi in the case of the two- and three- elements, respectively. The proposed antenna arrays can serve for the realization of point-to-point wireless links and can have a significant impact on compact and high-directive radiofrequency front-ends of a wireless system and for wireless power transfer applications.

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15

Hines, Paul C., Victor F. Humphrey e Victor Young. "Performance of a superdirective line array in nonideal environments". Journal of the Acoustical Society of America 114, n.º 4 (outubro de 2003): 2426. http://dx.doi.org/10.1121/1.4778855.

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16

Chryssomallis, M., e J. N. Sahalos. "A synoptic study of different superdirective endfire array concepts". Archiv für Elektrotechnik 76, n.º 6 (novembro de 1993): 469–76. http://dx.doi.org/10.1007/bf01576027.

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17

Hammoud, Mohamad, Abdullah Haskou, Ala Sharaiha e Sylvain Collardey. "Small end-fire superdirective folded meandered monopole antenna array". Microwave and Optical Technology Letters 58, n.º 9 (27 de junho de 2016): 2122–24. http://dx.doi.org/10.1002/mop.29995.

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18

Tsaliyev, Т. А. "A WEAKLY SUPERDIRECTIVE SLOTTED WAVEGUIDE ANTENNA ARRAY OF AXIAL RADIATION". Telecommunications and Radio Engineering 76, n.º 9 (2017): 751–60. http://dx.doi.org/10.1615/telecomradeng.v76.i9.10.

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19

Mazinani, S. Maryam, e Hamid Reza Hassani. "Superdirective Wideband Array of Planar Monopole Antenna With Loading Plates". IEEE Antennas and Wireless Propagation Letters 9 (2010): 978–81. http://dx.doi.org/10.1109/lawp.2010.2087411.

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20

Sodin, L. G. "Superdirective linear array antennas (optimization according to an integral criterion)". Journal of Communications Technology and Electronics 52, n.º 3 (março de 2007): 326–31. http://dx.doi.org/10.1134/s1064226907030060.

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21

Lu, Ping, Zhiwei Liu, Enpu Lei, Kama Huang e Chaoyun Song. "Superdirective Wideband Array of Circular Monopoles with Loaded Patches for Wireless Communications". Sensors 23, n.º 18 (13 de setembro de 2023): 7851. http://dx.doi.org/10.3390/s23187851.

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A wideband superdirective array, composed of a two-element circular monopole configuration, is introduced. The monopoles are placed in close proximity, facing each other on a metal ground. To ensure good matching at high frequencies, two pairs of elliptical patches are added to the sides of the monopoles, enhancing the surface current of the circular patch for wideband performance. To achieve equal amplitude excitation and the desired phase difference, a wideband power divider with a phase shifter is designed to feed the antenna array. Simulation and measurement results demonstrate that the proposed wideband antenna array, operating within the frequency range of 2.94–7.93 GHz, exhibits a maximum directivity of 8.36–10 dBi, with an antenna efficiency ranging from 47.86 to 83.18% across the bandwidth. The proposed array has the advantages of miniaturization, high directivity and wideband operation and can be widely used in various portable wireless communication systems, including WLAN (5.05–5.9 GHz), ISM (5.725–5.875 GHz), 5G communication (3.3–3.8 GHz), etc.

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22

Hines, Paul C., Daniel L. Hutt e Victor Young. "Measured performance of an endfire superdirective line array in littoral water". Journal of the Acoustical Society of America 110, n.º 5 (novembro de 2001): 2740. http://dx.doi.org/10.1121/1.4777521.

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23

Volmer, C., M. Sengul, J. Weber, R. Stephan e M. A. Hein. "Broadband Decoupling and Matching of a Superdirective Two-Port Antenna Array". IEEE Antennas and Wireless Propagation Letters 7 (2008): 613–16. http://dx.doi.org/10.1109/lawp.2008.2006767.

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24

Jaafar, Hussein, Sylvain Collardey e Ala Sharaiha. "Characteristic Modes Approach to Design Compact Superdirective Array With Enhanced Bandwidth". IEEE Transactions on Antennas and Propagation 66, n.º 12 (dezembro de 2018): 6986–96. http://dx.doi.org/10.1109/tap.2018.2874691.

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25

Derkx, RenÉ M. M., e Kees Janse. "Theoretical Analysis of a First-Order Azimuth-Steerable Superdirective Microphone Array". IEEE Transactions on Audio, Speech, and Language Processing 17, n.º 1 (janeiro de 2009): 150–62. http://dx.doi.org/10.1109/tasl.2008.2006583.

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26

Miaris, G., M. Chryssomallis, E. Vafiadis e J. N. Sahalos. "A unified formulation for Chebyshev and Legendre superdirective endfire array design". Electrical Engineering 78, n.º 4 (julho de 1995): 271–80. http://dx.doi.org/10.1007/bf01240234.

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27

Alexandridis, Anastasios, Anthony Griffin e Athanasios Mouchtaris. "Capturing and Reproducing Spatial Audio Based on a Circular Microphone Array". Journal of Electrical and Computer Engineering 2013 (2013): 1–16. http://dx.doi.org/10.1155/2013/718574.

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This paper proposes a real-time method for capturing and reproducing spatial audio based on a circular microphone array. Following a different approach than other recently proposed array-based methods for spatial audio, the proposed method estimates the directions of arrival of the active sound sources on a per time-frame basis and performs source separation with a fixed superdirective beamformer, which results in more accurate modelling and reproduction of the recorded acoustic environment. The separated source signals are downmixed into one monophonic audio signal, which, along with side information, is transmitted to the reproduction side. Reproduction is possible using either headphones or an arbitrary loudspeaker configuration. The method is compared with other recently proposed array-based spatial audio methods through a series of listening tests for both simulated and real microphone array recordings. Reproduction using both loudspeakers and headphones is considered in the listening tests. As the results indicate, the proposed method achieves excellent spatialization and sound quality.

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28

Russo, Ivan, Christian Canestri, Antonio Manna, Giorgio Mazzi e Antonio Tafuto. "Dual-Band Antenna Array With Superdirective Elements for Short-Distance Ballistic Tracking". IEEE Transactions on Antennas and Propagation 67, n.º 1 (janeiro de 2019): 232–41. http://dx.doi.org/10.1109/tap.2018.2877308.

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29

Iseki, Akihiro, Yuichiro Kinoshita e Kenji Ozawa. "Optimization of neural-network-based superdirective microphone-array system using a genetic algorithm". Acoustical Science and Technology 36, n.º 4 (2015): 326–32. http://dx.doi.org/10.1250/ast.36.326.

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30

Itoh, Keiichiro, Osamu Ishii, Yasuhiro Nagai, Naobumi Suzuki, Yoshihiro Kimachi e Osamu Michikami. "Two-element superdirective array antenna composed of high-T c superconducting small helical radiators". Journal of Superconductivity 5, n.º 5 (outubro de 1992): 485–90. http://dx.doi.org/10.1007/bf00620509.

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31

Zhang, Huajun, Huotao Gao, Huaqiao Zhao, Ting Cao e Boya Li. "A SET OF SIMPLE NUMERICAL PATTERN SYNTHESIS ALGORITHMS FOR ANTI-JAMMING WITH SUPERDIRECTIVE RECEIVING ARRAY". Progress In Electromagnetics Research M 49 (2016): 195–202. http://dx.doi.org/10.2528/pierm16052001.

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32

Kim, Oleksiy S., Sergey Pivnenko e Olav Breinbjerg. "Superdirective Magnetic Dipole Array as a First-Order Probe for Spherical Near-Field Antenna Measurements". IEEE Transactions on Antennas and Propagation 60, n.º 10 (outubro de 2012): 4670–76. http://dx.doi.org/10.1109/tap.2012.2207363.

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33

Ma, Xiaohui, Christoph Hohnerlein e Jens Ahrens. "Concept and Perceptual Validation of Listener-Position Adaptive Superdirective Crosstalk Cancellation Using a Linear Loudspeaker Array". Journal of the Audio Engineering Society 67, n.º 11 (22 de novembro de 2019): 871–81. http://dx.doi.org/10.17743/jaes.2019.0037.

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34

Guo Jun-Yuan, Yang Shi-E, Piao Sheng-Chun e Mo Ya-Xiao. "Direction-of-arrival estimation based on superdirective multi-pole vector sensor array for low-frequency underwater sound sources". Acta Physica Sinica 65, n.º 13 (2016): 134303. http://dx.doi.org/10.7498/aps.65.134303.

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35

Wang, Yuzhu, Jingdong Chen, Jacob Benesty, Jilu Jin e Gongping Huang. "Binaural Heterophasic Superdirective Beamforming". Sensors 21, n.º 1 (25 de dezembro de 2020): 74. http://dx.doi.org/10.3390/s21010074.

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The superdirective beamformer, while attractive for processing broadband acoustic signals, often suffers from the problem of white noise amplification. So, its application requires well-designed acoustic arrays with sensors of extremely low self-noise level, which is difficult if not impossible to attain. In this paper, a new binaural superdirective beamformer is proposed, which is divided into two sub-beamformers. Based on studies and facts in psychoacoustics, these two filters are designed in such a way that they are orthogonal to each other to make the white noise components in the binaural beamforming outputs incoherent while maximizing the output interaural coherence of the diffuse noise, which is important for the brain to localize the sound source of interest. As a result, the signal of interest in the binaural superdirective beamformer’s outputs is in phase but the white noise components in the outputs are random phase, so the human auditory system can better separate the acoustic signal of interest from white noise by listening to the outputs of the proposed approach. Experimental results show that the derived binaural superdirective beamformer is superior to its conventional monaural counterpart.

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36

Kates, James M. "Superdirective arrays for hearing aids". Journal of the Acoustical Society of America 94, n.º 4 (outubro de 1993): 1930–33. http://dx.doi.org/10.1121/1.407515.

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37

Merklinger, Harold M. "Superdirective and gradient sensor arrays". Journal of the Acoustical Society of America 114, n.º 4 (outubro de 2003): 2425. http://dx.doi.org/10.1121/1.4778839.

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38

Cavalieri, André V. G., Peter Jordan, Tim Colonius e Yves Gervais. "Axisymmetric superdirectivity in subsonic jets". Journal of Fluid Mechanics 704 (3 de julho de 2012): 388–420. http://dx.doi.org/10.1017/jfm.2012.247.

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AbstractWe present experimental results for the acoustic field of jets with Mach numbers between 0.35 and 0.6. An azimuthal ring array of six microphones, whose polar angle, $\theta $, was progressively varied, allows the decomposition of the acoustic pressure into azimuthal Fourier modes. In agreement with past observations, the sound field for low polar angles (measured with respect to the jet axis) is found to be dominated by the axisymmetric mode, particularly at the peak Strouhal number. The axisymmetric mode of the acoustic field can be clearly associated with an axially non-compact source, in the form of a wavepacket: the sound pressure level for peak frequencies is found be superdirective for all Mach numbers considered, with exponential decay as a function of $ \mathop{ (1\ensuremath{-} {M}_{c} \cos \theta )}\nolimits ^{2} $, where ${M}_{c} $ is the Mach number based on the phase velocity ${U}_{c} $ of the convected wave. While the mode $m= 1$ spectrum scales with Strouhal number, suggesting that its energy content is associated with turbulence scales, the axisymmetric mode scales with Helmholtz number – the ratio between source length scale and acoustic wavelength. The axisymmetric radiation has a stronger velocity dependence than the higher-order azimuthal modes, again in agreement with predictions of wavepacket models. We estimate the axial extent of the source of the axisymmetric component of the sound field to be of the order of six to eight jet diameters. This estimate is obtained in two different ways, using, respectively, the directivity shape and the velocity exponent of the sound radiation. The analysis furthermore shows that compressibility plays a significant role in the wavepacket dynamics, even at this low Mach number. Velocity fluctuations on the jet centreline are reduced as the Mach number is increased, an effect that must be accounted for in order to obtain a correct estimation of the velocity dependence of sound radiation. Finally, the higher-order azimuthal modes of the sound field are considered, and a model for the low-angle sound radiation by helical wavepackets is developed. The measured sound for azimuthal modes 1 and 2 at low Strouhal numbers is seen to correspond closely to the predicted directivity shapes.

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39

Dawoud, M. M., e M. A. Hassan. "Design of superdirective endfire antenna arrays". IEEE Transactions on Antennas and Propagation 37, n.º 6 (junho de 1989): 796–800. http://dx.doi.org/10.1109/8.29368.

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40

Hansen, R. C., e D. Gammon. "Superdirective linear arrays with uniform amplitudes". Microwave and Optical Technology Letters 20, n.º 1 (5 de janeiro de 1999): 28–31. http://dx.doi.org/10.1002/(sici)1098-2760(19990105)20:1<28::aid-mop7>3.0.co;2-3.

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41

Wang, Yong, Xiaoyuan Li, Long Yang e Yixin Yang. "Robust superdirective beamforming for arbitrary sensor arrays". Applied Acoustics 210 (julho de 2023): 109462. http://dx.doi.org/10.1016/j.apacoust.2023.109462.

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42

Haskou, Abdullah, Ala Sharaiha e Sylvain Collardey. "Theoretical and practical limits of superdirective antenna arrays". Comptes Rendus Physique 18, n.º 2 (fevereiro de 2017): 118–24. http://dx.doi.org/10.1016/j.crhy.2016.11.003.

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43

Malyuskin, Oleksandr, e Vincent F. Fusco. "Ultracompact Retrodirective Antenna Arrays With Superdirective Radiation Patterns". IEEE Transactions on Antennas and Propagation 64, n.º 7 (julho de 2016): 2923–35. http://dx.doi.org/10.1109/tap.2016.2560922.

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44

Zhou, Qing-Chen, Huotao Gao, Huajun Zhang e Fan Wang. "ROBUST SUPERDIRECTIVE BEAMFORMING FOR HF CIRCULAR RECEIVE ANTENNA ARRAYS". Progress In Electromagnetics Research 136 (2013): 665–79. http://dx.doi.org/10.2528/pier12122301.

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45

Yu, Gaokun, Yanping Qiu e Ning Wang. "A Robust Wavenumber-Domain Superdirective Beamforming for Endfire Arrays". IEEE Transactions on Signal Processing 69 (2021): 4890–905. http://dx.doi.org/10.1109/tsp.2021.3105754.

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46

Wang, Yong, Yixin Yang, Zhengyao He, Yuanliang Ma e Bing Li. "Robust Superdirective Frequency-Invariant Beamforming for Circular Sensor Arrays". IEEE Signal Processing Letters 24, n.º 8 (agosto de 2017): 1193–97. http://dx.doi.org/10.1109/lsp.2017.2712151.

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47

Haskou, Abdullah, Sylvain Collardey e Ala Sharaiha. "Measuring superdirective electrically small antenna arrays mounted on PCBs". Microwave and Optical Technology Letters 57, n.º 10 (29 de julho de 2015): 2269–74. http://dx.doi.org/10.1002/mop.29363.

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48

Ziolkowski, Richard W. "Superdirective Circular Arrays of Electric and Huygens Dipole Elements". Electromagnetic Science 2, n.º 1 (março de 2024): 1–25. http://dx.doi.org/10.23919/emsci.2024.0007.

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49

Ivanenkov, A. S., A. A. Rodionov e N. V. Savel’yev. "Superdirective Acoustic Imaging with the Use of Flexible Microphone Arrays". Radiophysics and Quantum Electronics 64, n.º 7 (dezembro de 2021): 471–81. http://dx.doi.org/10.1007/s11141-022-10148-5.

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50

Zhou, Qingchen, Huotao Gao, Huajun Zhang, Lin Zhou e Fan Wang. "Pattern synthesis method applied in designing HF superdirective receive arrays". IEICE Electronics Express 10, n.º 21 (2013): 20130715. http://dx.doi.org/10.1587/elex.10.20130715.

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