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Добірка наукової літератури з теми "Antenna arrays"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 31 липня 2024

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Статті в журналах з теми "Antenna arrays"

Thevenot, M., C. Menudier, A. El Sayed Ahmad, G. Zakka El Nashef, F. Fezai, Y. Abdallah, E. Arnaud, F. Torres, and T. Monediere. "Synthesis of Antenna Arrays and Parasitic Antenna Arrays with Mutual Couplings." International Journal of Antennas and Propagation 2012 (2012): 1–22. http://dx.doi.org/10.1155/2012/309728.

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Анотація:

A synthesis method to design multielement antennas with couplings is presented. The main objective is to perform a rigorous determination of the electromagnetic characteristics involved in the design, especially with arrays of moderate sizes. The aim is to conceive jointly and efficiently the antenna and the circuits to connect (feed distribution network, power amplifiers, reactive loads, etc.). The subsequent objective is to improve the understanding and capabilities of strongly coupled antennas. As a whole, the synthesis procedure is then applied to different antenna architectures in order to show its efficiency and versatility. A focus on some antenna concepts where the management of couplings is a key factor to improve the performances is presented. After describing the synthesis procedure, the first category of coupled multielement antenna studied concerns radiating arrays in linear or circular polarization. A design including couplings effects on an active array is also presented. Then, the method is applied to parasitic antenna arrays and a specific investigation on reflectarray antenna is performed as they can be considered as a particular case of parasitic arrays.

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Wang, Shiyu, Gaoqi Dou, and Guangming Song. "Minitype Arrays of Acoustically Actuated Magnetoelectric Antennas for Magnetic Induction Communication." Actuators 13, no. 8 (July 23, 2024): 276. http://dx.doi.org/10.3390/act13080276.

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The magnetoelectric (ME) antennas rely on the mechanical movement of magnetic dipoles, making it possible to break the constraints on physical dimensions decided by the wavelength of the electromagnetic wavelength. The ME antennas achieve super-low frequency (SLF) communications with a smaller size to provide a novel solution for long-range, underwater, and underground communications; navigation over the horizon; and geological exploring. As a result, further theoretical research and optimization of ME antennas have been an open challenge for decades. Here, we report on minitype arrays of acoustically actuated ME antenna and their more rigorous equivalent circuits. These arrays of ME antenna adjust amplitude-frequency response through the mechanical regulation method. The mechanical parameters of ME antennas in the arrays result in regulating amplitude-frequency response, such as working frequency, fractional bandwidth, and intensity of magnetic induction. Our work provides a more accurate theoretical model and diverse array form over state-of-the-art ME antenna arrays. The frequency, fractional bandwidth, and magnetic induction strength of the ME antenna arrays were achieved to be adjustable in the ranges of 84 to 181 Hz, 3.9% to 8.3%, and two to four times, respectively. In addition, we have calculated the attenuation characteristics of ME antennas and their minitype arrays in seawater. The results show that the ME antenna array described in this manuscript is able to enhance the radiation intensity and information-loading capability, which has a positive potential for application in SLF communication systems.

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Shevchenko, M. E., A. B. Gorovoy, V. M. Balashov, and S. N. Solovyov. "Features of application of ESPRIT method for different configurations of antenna arrays." Issues of radio electronics, no. 12 (February 3, 2021): 30–37. http://dx.doi.org/10.21778/2218-5453-2020-12-30-37.

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The paper discusses the features of the application of the ESPRIT method, which provides direction finding of a variety of radio sources with minimal computational costs, including in real time. To be able to use ESPRIT, antenna arrays are required that have the property of shift invariance, and for practical implementation, antenna arrays are required that allow you to form estimates of the directions of arrival of the largest number of signals that overlap in the spectrum, with a minimum number of antennas and reception channels. The aim of the work is to analyze the influence of the antenna array configuration on the features of ESPRIT application for different antenna array with the same number of antennas. A comparative qualitative analysis of the properties and features compared to the MUSIC method is presented. The algorithms developed by the authors for processing multichannel data received by angle and square antenna arrays are presented. It is shown analytically that when using a corner antenna array, it is necessary to take into account the possible presence of signals from indistinguishable-mirror directions of arrival. With a square antenna array, there are no mirror directions of arrival of different signals, which simplifies the implementation of the algorithm. It is shown analytically and by simulation modeling that the configuration of a square antenna array allows to increase the number of simultaneously tracked signals that overlap in the spectrum, compared to a corner antenna array with the same number of antennas.

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Mohd Aminudin Jamlos, Nurasma Husna Mohd Sabri, Mohd Faizal Jamlos, Wan Azani Mustafa, Syed Zulkarnain Syed Idrus, Mohamad Nur Khairul Hafizi Rohani, Khairul Najmy Abdul Rani, and Mohd AL Hafiz Mohd Nawi. "5.8 GHz Circularly Polarized Rectangular Microstrip Antenna Arrays simulation for Point-to-Point Application." Journal of Advanced Research in Applied Sciences and Engineering Technology 28, no. 3 (November 30, 2022): 209–20. http://dx.doi.org/10.37934/araset.28.3.209220.

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In this paper, the design and simulation of rectangular microstrip antenna arrays for improving antenna gain is performed for point-to-point application. The proposed design is composed of four elements microstrip antenna with an array configuration operating at 5.8 GHz. Each element is constructed from four truncated arrays radiating elements and an inclined slot on each patch which capable to achieve circular polarized capability. The design of the 2x1 and 2x2 of rectangular microstrip array antenna was implemented from the designed of single rectangular patch antenna as the basic building element. The designed 2x1 and 2x2 array were fed by microstrip transmission line which applied a technique of quarter wave impedance matching. The antenna design was etched on Rogers RT 5880 substrate with 2.1 and 1.53 mm of dielectric constant and thickness respectively. All the designed structure were simulated in CST software. The main results of the designed antennas were compared in terms of gain, axial ratio and return loss. Based on the return loss simulation results, the designed antennas resonated exactly at the desired resonant frequency of 5.8 GHz which indicates good antenna designs. Compared to the single patch antenna having an antenna gain of 8.26 dB, the 2x1 and 2x2 arrays achieved a gain of 10.24 dB and 13.29 dB respectively. The results show that the designed rectangular microstrip antenna arrays have an improved gain performance over the single patch antenna.

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Radzivilov, H., M. Ilyinov, and P. Khomenko. "Features computation diagram of annular direction antenna arrays what made on half-wave vibrators located above cylindrical surface." Communication, informatization and cybersecurity systems and technologies, no. 5 (June 1, 2024): 130–37. http://dx.doi.org/10.58254/viti.5.2024.12.130.

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The use of antenna-feeder devices, especially installed on moving objects, indicates the need to modernize and develop new type antenna devices to increase the efficiency of the radio communication system in conditions of active radio electronic suppression. One of the options for providing interference protection in communication channels with moving objects is the use of narrowly directed Smart antennas with a controlled directional pattern. Smart antennas, which are also called intelligent antennas, are one of the varieties of phased antenna arrays. Smart antennas use a set of radiating elements built in the form of grids. The most widespread are the ring antenna arrays, which are characterized by their compactness and great functionality. The relevance of the task of designing Smart antennas is to reduce the total number of emitters without degrading the antenna parameters. This task is particularly important for antennas with circular radiation patterns in communication systems with moving objects. The obtained results clearly show the possibilities of ring antenna arrays layout, depending on the radius of the antenna array and the radius of the cylindrical support, and under which conditions the geometric dimensions of the ring antenna arrays will preserve the coefficient of uniformity of the directional pattern. In order to reduce the number of vibrators in such antennas, the maximum distance between the vibrators is usually found, at which the uniformity of β directional diagrams does not decrease below a given level. To find the permissible distance, you can calculate the dependence of β on the radius of the grating directly when calculating the azimuthal directional diagrams of the antenna. To solve this problem, the external characteristics of the ring antenna arrays performed on half-wave symmetric vibrators in ideal conditions and vibrators placed over a cylindrical surface were considered.

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Mitilineos, Stelios A., Symeon K. Symeonidis, Ioannis B. Mpatsis, Dimitrios Iliopoulos, Georgios S. Kliros, Stylianos P. Savaidis, and Nikolaos A. Stathopoulos. "Conformal Patch Antenna Arrays Design for Onboard Ship Deployment Using Genetic Algorithms." Advances in Power Electronics 2013 (March 12, 2013): 1–5. http://dx.doi.org/10.1155/2013/960514.

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Анотація:

Conformal antennas and antenna arrays (arrays) have become necessary for vehicular communications where a high degree of aerodynamic drag reduction is needed, like in avionics and ships. However, the necessity to conform to a predefined shape (e.g., of an aircraft’s nose) directly affects antenna performance since it imposes strict constraints to the antenna array’s shape, element spacing, relative signal phase, and so forth. Thereupon, it is necessary to investigate counterintuitive and arbitrary antenna shapes in order to compensate for these constraints. Since there does not exist any available theoretical frame for designing and developing arbitrary-shape antennas in a straightforward manner, we have developed a platform combining a genetic algorithm-based design, optimization suite, and an electromagnetic simulator for designing patch antennas with a shape that is not a priori known (the genetic algorithm optimizes the shape of the patch antenna). The proposed platform is further enhanced by the ability to design and optimize antenna arrays and is intended to be used for the design of a series of antennas including conformal antennas for shipping applications. The flexibility and performance of the proposed platform are demonstrated herein via the design of a high-performance GPS patch antenna.

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Bagus, Bambang, Sukahir Sukahir, Ayub Wimatra, and Fatmawati Sabur. "ANALISA PENINGKATAN GAIN ANTENNA MENGGUNAKAN ARRAY FEEDING PADA FREKUENSI X BAND." Jurnal Penelitian 8, no. 1 (April 13, 2023): 28–41. http://dx.doi.org/10.46491/jp.v8i1.1356.

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Microstrip antennas are antennas that are often applied because of their simple structure and easy to apply. The purpose of the experiment was to design and analyze the results of microstrip antennas in CST applications with a frequency of 10.5 GHz. Experiments used single patch antennas, 1 x 2 arrays using 2 patches and 1 x 4 antenna arrays using 4 antenna patches. Each series has different characteristics of return loss, gain, VSWR, and axial ratio. Based on these experiments, the results were obtained, namely the return loss of single patch, array 1x2 and array 1 x 4 respectively were -19 dB, -11 dB and -19 dB, while antenna gain was 2.9 times, 9.09 times and 2.27 times. The lowest VSWR value is found in the single patch circuit while the highest is found in the 1 x 4 array antenna. The axial ratio of a single patch and an array of 1 x 4 has the same value of 40, while a series of arrays of 1 x 2 has an axial ratio value of 35. Based on these results, it can be concluded that each circuit has a specification of values that are not the same, but it is still included in the appropriate antenna criteria, namely VSWR <2 and return loss below -10 dB.

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Kim, Ilkyu, and Eunhee Kim. "Quad-Band Uniformly Spaced Array Antenna Using Diverse Patch and Fractal Antennas." Applied Sciences 13, no. 6 (March 14, 2023): 3675. http://dx.doi.org/10.3390/app13063675.

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Анотація:

Multi-band antennas have received significant interest because they can support multiple wireless communication services with a single antenna. However, an array antenna consisting of these element antennas can suffer from non-periodic arrangement due to the irregular sizes of the elements. In this paper, various shapes of patch antennas with fractal antennas are used to ensure the periodic arrangement of the array antenna, and antenna array incorporated with a feed network is proposed. Four different antenna arrays operating at 2.45/3.7/4.3/5.0 GHz are aggregated in an antenna with interleaved disposition of the different element antennas. It is observed that mutual couplings between two elements are sufficiently low, at less than −23 dB. Peak antenna gain ranging from 11.1 dBi to 14.4 dBi at the four different bands is obtained.

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Obiadi Ifeanyi F., Udofia Kufre M., and Udofia Kingsley M. "Comparative Analysis of Microstrip Antenna Arrays with Diverse Feeding Techniques." Journal of Engineering Research and Reports 26, no. 1 (January 9, 2024): 18–38. http://dx.doi.org/10.9734/jerr/2024/v26i11060.

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A robust antenna design and analysis to fit the growing technology trend and give engineers and technicians options is crucial. This is especially true considering the recent rise in wireless smart devices. This paper compares microstrip antenna arrays fed in different ways. This work designed, simulated, and analyzed six antennas: two single-band rectangular microstrip antennas (RMSAs) with quarter wave (QWT) feed and the other with inset feed, one series-fed 1 x 4 RMSA array, two cooperate-fed (1 x 2 and 1 x 4) and a 2 x 2 cooperate-series-fed RMSA array at 2.4 GHz. Simulations showed that single-band antennas achieved 65.3 MHz and 68.3 MHz (2.72% and 2.85%) fractional bandwidths at 2.4 GHz. Series-fed and cooperative-fed 1 x 4 arrays, respectively, achieved bandwidths of 152.07 MHz and 44.33 MHz (6.34 % and 1.85 %) fractional bandwidth. The 1 x 2 cooperate-fed and 2 x 2 cooperate-series-fed array antennas had bandwidths of 33.06 MHz and 50.41 MHz (for 1.38% and 2.26%), respectively. A comparison of antenna gains revealed that the study's goals were met as a result of the realized antenna gain of the 2 x 2 cooperate-series-fed antenna which exceeded all other compared antenna gain. The 1 x 4 RMSA array with series feeding had a significantly higher bandwidth than its studied contemporaries. The achieved antenna's bandwidth qualifies it for application small ISM-band WLAN devices; for less portable devices, 2× 2 hybrid-fed array antenna is a suitable candidate for application.

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Mao, Yanfei, Shiju E, and Chungeng Zhu. "A New and Simple Design Method for End-Fire Dipole Antenna Array and Three Two-Element 24 GHz Planar End-Fire Dipole Antenna Arrays." Applied Sciences 11, no. 16 (August 23, 2021): 7720. http://dx.doi.org/10.3390/app11167720.

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Анотація:

For an RF system, a high-gain antenna helps to improve the equivalent isotropic radiated power (EIRP) of the transmitter and an end-fire antenna array helps to improve the directivity (D) and half power beam width (HP) of the antenna. This work presents a new and simple design method for end-fire antenna array design. The method states that when antenna elements are λ/2 apart, a simple end-fire antenna array could be designed and constructed easily without matching networks between antenna elements. Utilizing Rogers 4350 PCB technology, three 24 GHz high-gain, compact planar two-element end-fire dipole antenna arrays are designed to verify this new design method. The achieved results are three two-element end-fire antennas with gains of 8.8, 9.9 and 9.1 dBi. These antenna arrays are characterized by high gain and simplicity in design. They are also very compact in size, with an area of about 1.9 × 1.7 cm2. The benefit of this work is that a new and simple design for end-fire antenna design is suggested, and three two-element end-fire dipole antenna arrays in planar technology which adopt the design method are presented. A utility model patent was granted for this end-fire dipole array antenna topology, ZL 202022106332.1.

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Дисертації з теми "Antenna arrays"

Albannay, Mohammed Masoud. "Array of antenna arrays." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/75576/1/Mohammed_Albannay_Thesis.pdf.

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Анотація:

Antenna arrays are groups of antenna elements spaced in a geometrical pattern. By changing the phase excitation of each element, the array is capable of transmitting electromagnetic waves strongly in a chosen direction with little or no radiation in another direction, thus controlling the array's radiation pattern without physically moving any parts. An antenna array of sub-arrays replaces conventional antenna elements with compact circular arrays with potential for improved performance. This thesis expands on the concept by exploring the development, realisation and operation of an array of subarrays. The overall size of the array essentially remains the same, but the array's performance is improved due to having steerable directive subarrays. The negative effects of strong mutual coupling between closely spaced elements of a subarray are analysed and a number of new solutions for element decoupling are proposed.

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Eng, Cher Shin. "Digital antenna architectures using commercial off-the-shelf hardware." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Dec%5FEng.pdf.

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Анотація:

Thesis (M.S. in Engineering Science (Electrical Engineering)--Naval Postgraduate School, December 2003.
Thesis advisor(s): David C. Jenn, Roberto Cristi. Includes bibliographical references (p. 75-76). Also available online.

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Dohler, Michael. "Virtual antenna arrays." Thesis, King's College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.407331.

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Hildebrand, Louis Trichardt. "The analysis of microstrip wire-grid antenna arrays." Pretoria : [s.n.], 2010. http://upetd.up.ac.za/thesis/available/etd-01272010-130234/.

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Alsawaha, Hamad Waled. "Synthesis of Ultra-Wideband Array Antennas." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/54553.

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Acquisition of ultra-wideband signals by means of array antennas requires essentially frequency-independent radiation characteristics over the entire bandwidth of the signal in order to avoid distortions. Factors contributing to bandwidth limitation of arrays include array factor, radiation characteristics of the array element, and inter-element mutual coupling. Strictly speaking, distortion-free transmission or reception of ultra-wideband signals can be maintained if the magnitude of the radiated field of the array remains constant while its phase varies linearly with frequency over the bandwidth of interest. The existing wideband-array synthesis methods do not account for all factors affecting the array bandwidth and are often limited to considering the array factor and not the total field of the array in the synthesis process. The goal of this study is to present an ultra-wideband array synthesis technique taking into account all frequency-dependent properties, including array total pattern, phase of the total radiated field, element field, element input impedance, and inter-element mutual coupling. The proposed array synthesis technique is based on the utilization of frequency-adaptive element excitations in conjunction with expressing the total radiated field of the array as a complex Fourier series. Using the proposed method, element excitation currents required for achieving a desired radiation pattern, while compensating for frequency variations of the element radiation characteristics and the inter-element mutual coupling, are calculated. An important consideration in the proposed ultra-wideband array design is that the "phase bandwidth", defined as the frequency range over which the phase of the total radiated field of the array varies linearly with frequency, is taken into account as a design requirement in the synthesis process. Design examples of linear arrays with desired radiation patterns that are expected to remain unchanged over the bandwidth of interest are presented and simulated. Two example arrays, one with a wire dipole as its element and another using an elliptically-shaped disc dipole as the element are studied. Simulation results for far-field patterns, magnitude and phase characteristics, and other performance criteria such as side-lobe level and scanning range are presented. Synthesis of two-dimensional planar arrays is carried out by employing the formulations developed for linear arrays but generalized to accommodate the geometry of planar rectangular arrays. As example designs, planar arrays with wire dipoles and elliptical-shaped disc dipoles are studied. The simulation results indicate that synthesis of ultra-wideband arrays can be accomplished successfully using the technique presented in this work. The proposed technique is robust and comprehensive, nonetheless it is understood that the achieved performance of a synthesized array and how closely the desired performance is met also depends on some of the choices the array designer makes and other constraints, such as number of elements, type of element, size, and ultimately cost.
Ph. D.

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Ong, Chin Siang. "Digital phased array architectures for radar and communications based on off-the-shelf wireless technologies." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Dec%5FOng.pdf.

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Анотація:

Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, December 2004.
Thesis advisor(s): David C. Jenn, Siew Yam Yeo. Includes bibliographical references (p. 63-64). Also available online.

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Petrus, Paul. "Blind adaptive antenna arrays for mobile communications." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07112009-040414/.

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Lai, Hau Wah. "Wideband meandering probe-fed patch antenna /." access full-text access abstract and table of contents, 2005. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-ee-b19887383a.pdf.

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Thesis (Ph. D.)--City University of Hong Kong, 2005.
"Submitted to Department of Electronic Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy." Includes bibliographical references (leaves 144-153).

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Khan, Asim Ali. "Performance optimisation of small antenna arrays." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/performance-optimisation-of-small-antenna-arrays(759e6929-04ab-408c-aee3-404c72711cdb).html.

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This thesis addresses radiation pattern synthesis problems for small linear periodic phased arrays (with array elements less then 10). Due to the small array size conventional pattern synthesis techniques fail to produce the required results. In the case of practical small arrays, mutual coupling and element pattern asymmetric effect degrade the array radiation performance. The main performance metrics considered in this thesis include side lobe level (SLL), gain, halfpower beamwidth (HPBW) and mainbeam scan direction. The conventional pattern synthesis approaches result in sub optimal gain, SLL and HPBW due to the limited number of elements and the mutual coupling involved. In case of difference pattern synthesis these factors resulted in lower difference pattern slope, degraded SLL and difference peak asymmetry. The sum and difference patterns are used in monopulse arrays and a simplified feed that could produce both patterns with acceptable radiation properties is of interest and has been examined (chapter 5). A conventional technique is applied to small arrays to synthesise a sector beam and there is limited control over the radiation pattern. It is shown that the mutual coupling has significant effect on the array radiation pattern and mitigation is necessary for optimum performance (chapter 6). Furthermore, wideband phased arrays may have a natural limitation of the HPBW in low gain applications and minimisation of the variation becomes important. Also the SLL variations for wideband antenna arrays in the presence of mutual coupling considerably degrade the radiation pattern. The mutual coupling degrades significantly the radiation pattern performance in case of small scanning wideband arrays (chapter 7). It is the primary goal of this thesis to develop an optimisation scheme thatis applied in the above scenarios (chapters 3 & 4). The only degree of freedom assumed is the array excitation. Optimised amplitude and phase for each element in the array are determined by the proposed scheme, concurrently. The deterministic optimisation techniques reported in the literature for the pattern synthesis may involve complicated problem modelling. The heuristic opti-misation techniques generally are computationally expensive. The proposedIntelligent z-space Boundary Condition-Particle Swarm Optimiser (IzBC-PSO)is based on a heuristic algorithm. This scheme can be applied to a wider rangeof problems without significant modifications and requires fewer computationscompared to the competing techniques.In order to verify the performance of IzBC-PSO antenna array measure-ments were performed in the receiving mode only using the online and offlinedigital beamforming setups described in chapter 8. The measurement resultsshow that the proposed scheme may be successfully applied with both onlineand offline digital beamformers for a practical small array (chapter 8).

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Varum, Tiago Miguel Valente. "Nonuniform 2D microstrip antenna arrays for wireless applications." Doctoral thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/17373.

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Анотація:

Doutoramento em Engenharia Electrotécnica
Wireless communications have undergone over the last decades a tremendous progress as a consequence of the exponential growth in demand for mobile devices, and nowadays are more and more involved in people's lives. This presence is re ected through the use of a large number of applications of which they become increasingly dependent on. The antenna, in its most di erent forms, are crucial elements in the establishment this type of communication. Each application involves a number of speci c characteristics, whereby, the improvement of wireless communications is related to the appropriateness of the used antenna. Many applications require antennas with radiation pattern with its particular shapes (in terms of beamwidth, side lobes levels, direction, etc ..), static or dynamic (adaptive antennas), involving in most cases the use antenna arrays to meet to such constraints. In this thesis, a number of techniques to synthesize antennas consisting of planar arrays with nonuniform excitation of their elements, are addressed. A group of the direction of arrival and beamforming estimation algorithms are also presented and analyzed, in order to enable their application in adaptive antenna array with dynamic beamforming. A vast and diversi ed set of arrays with di erent radiation requirements, and for di erent applications were developed. These arrays have great applicability in current research topics in antennas, such as vehicle communications, Wi-Fi in sports venues and smart antennas.
As comunicações sem os têm sofrido, ao longo das ultimas décadas, um enorme progresso em consequência do aumento exponencial da procura de dispositivos móveis, estando hoje em dia cada vez mais presentes na vida das pessoas. Esta presença re ete-se através do uso de um elevado número de aplicações das quais se tornam cada vez mais dependentes. As antenas, nas suas mais diversi cadas formas, são elementos cruciais no estabelecimento deste tipo de comunicações. Cada aplicação envolve um conjunto de características especí cas, pelo que a melhoria das comunica ções sem os está relacionada com a adequação da antena usada. Muitas aplicações necessitam de antenas com diagramas de radiação com formatos próprios (em termos de larguras de feixe, níveis de lobos secund ários, direção, etc..), sejam eles estáticos ou dinâmicos (antenas adaptativas), implicando na maioria dos casos o uso de agregados de antenas para fazer face a tais condições. Nesta tese são abordadas várias técnicas de desenho de antenas constituídas por agregados planares, com alimentação não uniforme dos seus elementos. Um conjunto de algoritmos de estimação dos ângulos de chegada e de formação de feixe são também apresentados e analisados com vista à sua aplicação em agregados de antenas adaptativas, com formação de feixe dinâmico. Um vasto e diversi cado conjunto de agregados com diferentes requisitos de radiação, destinados a diferentes aplicações foram desenvolvidos. Estes agregados têm grande aplicabilidade nos atuais tópicos de investiga ção em antenas, tais como as comunicações veiculares, Wi-Fi em espaços desportivos e smart antenas.

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Книги з теми "Antenna arrays"

Haupt, Randy L. Antenna Arrays. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470937464.

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Chandran, Sathish, ed. Adaptive Antenna Arrays. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05592-2.

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Haupt, Randy L. Antenna arrays: A computational approach. Hoboken, N.J: Wiley-IEEE Press, 2010.

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Haupt, Randy L. Antenna arrays: A computational approach. Hoboken, N.J: Wiley-IEEE Press, 2010.

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Munk, Ben. Finite antenna arrays and FSS. Hoboken, NJ: John Wiley, 2003.

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L, Haupt Randy, and Miller Thomas W, eds. Introduction to adaptive arrays. 2nd ed. Raleigh, NC: SciTech Pub., 2011.

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V, Minin O., ed. Basic principles of Fresnel antenna arrays. Berlin: Springer, 2008.

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Center, Langley Research, ed. Technique for extension of small antenna array mutual-coupling dta to larger antenna arrays. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1996.

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United States. National Aeronautics and Space Administration., ed. Spaceborne distributed SAR antenna. Boulder, Colo: Ball Aerospace Systems Division, 1985.

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Munk, Ben A. Finite Antenna Arrays and FSS. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2003. http://dx.doi.org/10.1002/0471457531.

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Частини книг з теми "Antenna arrays"

Levin, Boris. "Arrays." In Antenna Engineering, 280–304. Boca Raton : Taylor & Francis, CRC Press, 2017.: CRC Press, 2017. http://dx.doi.org/10.1201/9781315367712-11.

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Mailloux, Robert J. "Periodic Arrays." In Antenna Handbook, 843–910. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4615-6459-1_13.

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Lo, Yuen T. "Aperiodic Arrays." In Antenna Handbook, 911–47. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4615-6459-1_14.

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Okon, Ernest E. "Antenna Arrays." In Ultra-Wideband, 49–66. Chichester, UK: John Wiley & Sons, Ltd, 2006. http://dx.doi.org/10.1002/0470056843.ch4.

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Rulf, Benjamin, and Gregory A. Robertshaw. "Antenna Arrays." In Understanding Antennas for Radar, Communications, and Avionics, 137–57. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-011-6541-9_9.

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Ahmed, Yasir. "Antenna Arrays." In Recipes for Communication and Signal Processing, 99–131. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2917-7_6.

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Voskresenskii, Dmitrii Ivanovich, Aleksandr Iur’evich Grinev, and Evgenii Nikolaevich Voronin. "Formation of the Antenna Pattern of Nonplanar Array Antennas." In Electrooptical Arrays, 71–102. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4612-3484-5_4.

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Tsoulos, George. "Adaptive Antennas and MIMO Systems for Mobile Communications." In Adaptive Antenna Arrays, 3–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05592-2_1.

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Thron, Chris, Chengke Sheng, and Leon Turner. "High Performance Path Searcher for CDMA Adaptive Antenna Systems." In Adaptive Antenna Arrays, 171–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05592-2_10.

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Ohira, Takashi, and Jun Cheng. "Analog Smart Antennas." In Adaptive Antenna Arrays, 184–204. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05592-2_11.

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Тези доповідей конференцій з теми "Antenna arrays"

Aliev, I. V., and V. I. Nosov. "Study of the characteristics of planar antenna arrays." In Modern Problems of Telecommunications - 2024. Siberian State University of Telecommunications and Information Systems, 2024. http://dx.doi.org/10.55648/spt-2024-1-304.

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The paper presents a mathematical model of MIMO and analysis of directional properties of planar square antenna arrays. To create the configuration and analyze the directional properties of the considered antenna array, the built-in application Sensor Array Analyzer of the Matlab application package is used.

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Karimi, Vahid, and Viktoriia E. Babicheva. "Lattice Resonances in Dielectric Antenna Arrays with Finite Dimensions." In 3D Image Acquisition and Display: Technology, Perception and Applications. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/3d.2023.jtu4a.2.

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We investigate periodic lattice effects on silicon antenna arrays’ optical characteristics. Our approach employs coupled-electric-magnetic-dipole calculations for finite-size arrays, showing faster convergence in broad resonances. Altered lattice resonances through array period modifications require higher antenna density for convergence.

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"Antenna arrays." In 2005 5th International Conference on Antenna Theory and Techniques. IEEE, 2005. http://dx.doi.org/10.1109/icatt.2005.1496926.

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"Antenna arrays." In 2017 Radiation and Scattering of Electromagnetic Waves (RSEMW). IEEE, 2017. http://dx.doi.org/10.1109/rsemw.2017.8103556.

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Baca, Loretta J., and John G. McInerney. "A High-speed Microwave Antenna Suitable for Optoelectronic Integration." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.fnn5.

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Broadband antenna arrays are essential for applications such as radar, frequency-agile microwave communication and electronic counter-measures. Optical feeding of the individual elements of such arrays is promising for beam steering, remote positioning of the antenna with respect to the signal source or receiver, and for high-frequency operation where the inter-element spacing becomes too small for individual waveguide feeds. In this paper we describe the design, fabrication and evaluation of a compact broadband antenna on semi-insulating GaAs or similar material, which lends itself readily to array formation, and which is readily integrable with high-speed electronic and optoelectronic components for optical feeding and phase-shifting. Our design methodology has used the effective index method commonly used in optical waveguide analysis, in place of the more conventional but cumbersome method of moments. This simplification is justified by the strong confinement of the fields within the high-permittivity substrate. A slot-line antenna with a four-section Chebyshev quarter-wave impedance transformer and Marchand balun was designed and fabricated on Duroid 6010, a material chosen for its similar dielectric properties to semi-insulating GaAs. By measuring the SWR using a microwave network analyzer and sweep oscillator, and by using the antenna in receiving mode on an anechoic test range, we have demonstrated successful performance with at least 10 dB directional gain in the designed range 16-18 GHz. Possible applications of single- and multiple-element antennas of this type in hybrid optical/microwave systems will be discussed.

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"Antenna arrays, adaptive and smart antennas." In 2015 International Conference on Antenna Theory and Techniques (ICATT). IEEE, 2015. http://dx.doi.org/10.1109/icatt.2015.7136813.

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Chavka, G. G. "Ultrawideband planar antennas and antenna arrays." In 2012 6th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS). IEEE, 2012. http://dx.doi.org/10.1109/uwbusis.2012.6379719.

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Wei, Changning, and Ke-Li Wu. "Array-antenna decoupling surfaces for quasi-yagi antenna arrays." In 2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2017. http://dx.doi.org/10.1109/apusncursinrsm.2017.8073094.

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Burr, A. G. "Multiband MIMO antenna arrays." In Wideband and Multi-Band Antennas and Arrays. IEE, 2005. http://dx.doi.org/10.1049/ic:20050301.

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Haupt, Randy L., and Mark Leifer. "Adaptive Antenna Arrays." In 2019 IEEE Radar Conference (RadarConf19). IEEE, 2019. http://dx.doi.org/10.1109/radar.2019.8835686.

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Звіти організацій з теми "Antenna arrays"

Rutledge, David. Imaging Antenna Arrays. Fort Belvoir, VA: Defense Technical Information Center, December 1985. http://dx.doi.org/10.21236/ada164055.

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Giri, D. V., K. F. Casey, M. C. Skipper, and M. D. Abdalla. Conformal Impulse Receive Antenna Arrays. Fort Belvoir, VA: Defense Technical Information Center, February 2005. http://dx.doi.org/10.21236/ada434641.

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Hill, David A., and Michael H. Francis. Out-of-band response of antenna arrays. Gaithersburg, MD: National Bureau of Standards, 1986. http://dx.doi.org/10.6028/nbs.ir.86-3047.

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Balasubramaniam, R. K., Victor Frost, Roger Spohn, Ryan Moates, and Stephen Fechtel. Evaluation of Hardware Architectures for HF Antenna Arrays. Fort Belvoir, VA: Defense Technical Information Center, January 1988. http://dx.doi.org/10.21236/ada196204.

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Tsap, B., L. R. Dalton, W. H. Steier, and H. R. Fetterman. Flexible Polymer Modulators for Large Conformal Antenna Arrays. Fort Belvoir, VA: Defense Technical Information Center, May 1999. http://dx.doi.org/10.21236/ada368349.

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Boreman, Glenn. Antenna-Coupled Uncooled Infrared Focal Plane Arrays: In-house Fabrication. Fort Belvoir, VA: Defense Technical Information Center, February 2002. http://dx.doi.org/10.21236/ada399579.

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White, D. J., D. R. Bowling, and P. L. Overfelt. Active Impedance Matching for Superdirective, Super-Gain HTS Antenna Arrays. Fort Belvoir, VA: Defense Technical Information Center, March 1996. http://dx.doi.org/10.21236/ada306546.

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Ren, Tianmin, and Richard J. La. Opportunistic Packet Scheduling in Cellular Networks with Base Station Antenna Arrays. Fort Belvoir, VA: Defense Technical Information Center, January 2006. http://dx.doi.org/10.21236/ada637216.

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Williams, Jonathan H., Robert J. Davis, and Eddie N. Rosario. Multipath Mitigation Performance of Planar GPS Adaptive Antenna Arrays for Precision Landing Ground Stations. Fort Belvoir, VA: Defense Technical Information Center, January 2000. http://dx.doi.org/10.21236/ada459739.

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Buche, Robert T., and Harold J. Kushner. Adaptively Optimizing the Algorithms for Adaptive Antenna Arrays for Randomly Time-Varying Mobile Communications Systems. Fort Belvoir, VA: Defense Technical Information Center, January 2002. http://dx.doi.org/10.21236/ada461804.

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